Data Sheet, Rev. 1

June 2001

FW801 PHY IEEE * 1394A

One-Cable Transceiver/Arbiter Device

Distinguishing Features

Compliant with IEEE P1394a Draft 2.0 Standard
for a High Performance Serial Bus (Supple-
ment)

Supports extended BIAS_HANDSHAKE time for
enhanced interoperability with camcorders

While unpowered and connected to the bus, will not
drive TPBIAS on a connected port even if receiving
incoming bias voltage on that port

Does not require external filter capacitors for PLL

Does not require a separate 5 V supply for 5 V link
controller interoperability

Interoperable across 1394 cable with 1394 physical
layers (PHY) using 5 V supplies

Interoperable with 1394 link-layer controllers using
5 V supplies

Device powerdown feature to conserve energy in
battery-powered applications

Interface to link-layer controller supports Annex J
electrical isolation as well as bus-keeper isolation

Features

Provides one fully compliant cable port at
100 Mbits/s, 200 Mbits/s, and 400 Mbits/s

Fully supports Open HCI requirements

Supports arbitrated short bus reset to improve
utilization of the bus

Supports ack-accelerated arbitration and fly-by
concatenation

Supports connection debounce

Supports multispeed packet concatenation

Supports PHY pinging and remote PHY access
packets

Fully supports suspend/resume

Supports PHY-link interface initialization and reset

Supports 1394a register set

Supports LPS/link-on as a part of PHY-link inter-
face

Supports provisions of IEEE 1394-1995 Standard
for a High Performance Serial Bus

Fully interoperable with FireWire

implementation

of IEEE 1394-1995

Reports cable power fail interrupt when voltage at
CPS pin falls below 7.5 V

Separate cable bias and driver termination voltage
supply for port

Other Features

48-pin TQFP package

Single 3.3 V supply operation

Data interface to link-layer controller provided
through 2/4/8 parallel lines at 50 Mbits/s

25 MHz crystal oscillator and PLL provide transmit/
receive data at 100 Mbits/s, 200 Mbits/s, and
400 Mbits/s and link-layer controller clock at
50 MHz

Multiple separate package signals provided for
analog and digital supplies and grounds

Description

The Agere Systems Inc. FW801 device provides the
analog physical layer functions needed to imple-
ment a one-port node in a cable-based IEEE 1394-
1995 and IEEE P1394a network.

The cable port incorporates two differential line
transceivers. The transceivers include circuitry to
monitor the line conditions as needed for determin-
ing connection status, for initialization and
arbitration, and for packet reception and transmis-
sion. The PHY is designed to interface with a link-
layer controller (LLC).

* IEEE is a registered trademark of The Institute of Electrical and

Electronics Engineers, Inc.

FireWire is a registered trademark of Apple Computer, Inc.

2
2

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Table of Contents

Contents

Page

Distinguishing Features ............................................................................................................................................1
Features ...................................................................................................................................................................1
Other Features .........................................................................................................................................................1
Description ................................................................................................................................................................1
Signal Information .....................................................................................................................................................6
Application Information .............................................................................................................................................9
1394 Application Support Contact Information .......................................................................................................10
Absolute Maximum Ratings ....................................................................................................................................11
Electrical Characteristics ........................................................................................................................................12
Timing Characteristics ............................................................................................................................................15
Timing Waveforms ..................................................................................................................................................16
Internal Register Configuration ...............................................................................................................................17
Outline Diagrams ....................................................................................................................................................22

List of Figures

Figure 1. Block Diagram .......................................................................................................................................... 5
Figure 2. Pin Assignments ....................................................................................................................................... 6
Figure 3. Typical External Component Connections ............................................................................................... 9
Figure 4. Typical Port Termination Network .......................................................................................................... 10
Figure 5. Dn, CTLn, and LREQ Input Setup and Hold Times Waveforms ............................................................ 16
Figure 6. Dn, CTLn Output Delay Relative to SYSCLK Waveforms ...................................................................... 16

List of Tables

Table 1. Signal Descriptions .....................................................................................................................................6
Table 2. Absolute Maximum Ratings ......................................................................................................................11
Table 3. Analog Characteristics ..............................................................................................................................12
Table 4. Driver Characteristics ...............................................................................................................................13
Table 5. Device Characteristics ..............................................................................................................................14
Table 6. Switching Characteristics .........................................................................................................................15
Table 7. Clock Characteristics ................................................................................................................................15
Table 8. PHY Register Map for the Cable Environment ........................................................................................17
Table 9. PHY Register Fields for the Cable Environment ......................................................................................17
Table 10. PHY Register Page 0: Port Status Page ................................................................................................19
Table 11. PHY Register Port Status Page Fields ...................................................................................................20
Table 12. PHY Register Page 1: Vendor Identification Page ...............................................................................21
Table 13. PHY Register Vendor Identification Page Fields ....................................................................................21

Data Sheet, Rev. 1

FW801 PHY IEEE 1394A

June 2001

One-Cable Transceiver/Arbiter Device

Agere Systems Inc.

Description

(continued)

The PHY requires either an external 24.576 MHz
crystal or crystal oscillator. The internal oscillator
drives an internal phase-locked loop (PLL), which
generates the required 400 MHz reference signal. The
400 MHz reference signal is internally divided to
provide the 49.152 MHz, 98.304 MHz, and
196.608 MHz clock signals that control transmission of
the outbound encoded strobe and data information.
The 49.152 MHz clock signal is also supplied to the
associated LLC for synchronization of the two chips
and is used for resynchronization of the received data.
The powerdown function, when enabled by the PD
signal high, stops operation of the PLL and disables all
circuitry except the cable-not-active signal circuitry.

The PHY supports an isolation barrier between itself
and its LLC. When /ISO is tied high, the link interface
outputs behave normally. When /ISO is tied low,
internal differentiating logic is enabled, and the outputs
become short pulses, which can be coupled through a
capacitor or transformer as described in the
IEEE 1394-1995 Annex J. To operate with bus-keeper
isolation, the /ISO pin of the FW801 must be tied high.

Data bits to be transmitted through the cable ports are
received from the LLC on two, four, or eight data lines
(D[0:7]), and are latched internally in the PHY in
synchronization with the 49.152 MHz system clock.
These bits are combined serially, encoded, and
transmitted at 98.304 Mbits/s, 196.608 Mbits/s, or
393.216 Mbits/s as the outbound data-strobe
information stream. During transmission, the encoded
data information is transmitted differentially on the TPA
and TPB cable pair(s).

During packet reception, the TPA and TPB
transmitters of the receiving cable port are disabled,
and the receivers for that port are enabled. The
encoded data information is received on the TPA and
TPB cable pair. The received data-strobe information
is decoded to recover the receive clock signal and the
serial data bits. The serial data bits are split into two,
four, or eight parallel streams, resynchronized to the
local system clock, and sent to the associated LLC.
The received data is also transmitted (repeated) out of
the other active (connected) cable ports.

Both the TPA and TPB cable interfaces incorporate
differential comparators to monitor the line states
during initialization and arbitration. The outputs of
these comparators are used by the internal logic to
determine the arbitration status. The TPA channel
monitors the incoming cable common-mode voltage.
The value of this common-mode voltage is used during
arbitration to set the speed of the next packet

transmission. In addition, the TPB channel monitors
the incoming cable common-mode voltage for the
presence of the remotely supplied twisted-pair bias
voltage. This monitor is called bias-detect.

The TPBIAS circuit monitors the value of incoming
TPA pair common-mode voltage when local TPBIAS is
inactive. Because this circuit has an internal current
source and the connected node has a current sink, the
monitored value indicates the cable connection status.
This monitor is called connect-detect.

Both the TPB bias-detect monitor and TPBIAS
connect-detect monitor are used in suspend/resume
signaling and cable connection detection.

The PHY provides a 1.86 V nominal bias voltage for
driver load termination. This bias voltage, when seen
through a cable by a remote receiver, indicates the
presence of an active connection. The value of this
bias voltage has been chosen to allow interoperability
between transceiver chips operating from 5 V or 3 V
nominal supplies. This bias voltage source should be
stabilized by using an external filter capacitor of
approximately 0.33

�F.

The transmitter circuitry, the receiver circuitry, and the
twisted-pair bias voltage circuity are all disabled with a
powerdown condition. The powerdown condition
occurs when the PD input is high. The port transmitter
circuitry and the receiver circuitry are also disabled
when the port is disabled, suspended, or
disconnected.

The line drivers in the PHY operate in a high-
impedance current mode and are designed to work
with external 112

line-termination resistor networks.

One network is provided at each end of each twisted-
pair cable. Each network is composed of a pair of
series-connected 56

resistors. The midpoint of the

pair of resistors that is directly connected to the
twisted-pair A (TPA) signals is connected to the
TPBIAS voltage signal. The midpoint of the pair of
resistors that is directly connected to the twisted-pair B
(TPB) signals is coupled to ground through a parallel
RC network with recommended resistor and capacitor
values of 5 k

and 220 pF, respectively. The value of

the external resistors are specified to meet the draft
standard specifications when connected in parallel
with the internal receiver circuits.

The driver output current, along with other internal
operating currents, is set by an external resistor. This
resistor is connected between the R0 and R1 signals
and has a value of 2.49 k

� 1%.

FW801 PHY IEEE 1394A

Data Sheet, Rev. 1

One-Cable Transceiver/Arbiter Device

June 2001

Agere Systems Inc.

Description

(continued)

The signal, C/LKON, as an input, indicates whether a
node is a contender for bus manager. When the
C/LKON signal is asserted, it means the node is a con-
tender for bus manager. When the signal is not
asserted, it means that the node is not a contender.
The C bit corresponds to bit 20 in the self-ID packet
(see Table 4-29 of the IEEE 1394-1995 standard for
additional details).

The power-class bits of the self-ID packet do not have
a default value. These bits can be initialized and read/
written through the LLC using the PHY Register Map
Figure 6-1 of the IEEE P1394a Draft 2.0 standard. See
Table 8 for the address space of the Pwr_class
register.

A powerdown signal (PD) is provided to allow a power-
down mode where most of the PHY circuits are
powered down to conserve energy in battery-powered
applications. A cable status signal, CNA, provides a
high output when none of twisted-pair cable ports are
receiving incoming bias voltage. This output is not
debounced. The CNA output can be used to deter-
mine when to power the PHY down or up. In the
powerdown mode, all circuitry is disabled except the
CNA circuitry. It should be noted that when the device
is powered down, it does not act in a repeater mode.

When the power supply of the PHY is removed while
the twisted-pair cables are connected, the PHY trans-
mitter and receiver circuitry has been designed to
present a high impedance to the cable in order to not
load the TPBIAS signal voltage on the other end of the
cable.

For reliable operation, the TPBn signals must be termi-
nated using the normal termination network regardless
of whether a cable is connected to a port or not con-
nected to a port. When a port does not have a cable
connected, internal connect-detect circuitry will keep
the port in a disconnected state.

Note: All gap counts on all nodes of a 1394 bus must

be identical. This may be accomplished by using
PHY configuration packets (see Section 4.3.4.3
of IEEE 1394-1995 standard) or by using two
bus resets, which resets the gap counts to the
maximum level (3Fh).

The link power status (LPS) signal works with the
C/LKON signal to manage the LLC power usage of the
node. The LPS signal indicates that the LLC of the
node is powered up or powered down. If LPS is inac-
tive for more than 1.2

�s and less than 25 �s, PHY/link

interface is reset. If LPS is inactive for greater than
25

�s, the PHY will disable the PHY/link interface to

save power. If the PHY then receives a link-on packet,
the C/LKON signal is activated to output a 6.114 MHz
signal, which can be used by the LLC to power itself
up. Once the LLC is powered up, the LPS signal com-
municates this to the PHY and the PHY/link interface
is enabled. C/LKON signal is turned off when both LPS
is active and Link_active bit (see Table 9) is set.

Two of the signals are used to set up various test con-
ditions used in manufacturing. These signals, SE and
SM, should be connected to V

for normal operation.

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Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Signal Information

5-7302.b (F)

Note: Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Figure 2. Pin Assignments

Table 1. Signal Descriptions

Pin

Signal*

Type

Name/Description

C/LKON

I/O

Bus Manager Capable Input and Link-On Output. On hardware reset, this pin is
used to set the default value of the contender status indicated during self-ID. The
bit value programming is done by tying the signal through a 10 k

resistor to V

(high, bus manager capable) or to GND (low, not bus manager capable). Using
either the pull-up or pull-down resistor allows the link-on output to override the input
value when necessary.

After hardware reset, this pin is set as an output, C/LKON indicates the reception of
a link-on message by asserting a 6.114 MHz signal.

CNA

Cable-Not-Active Output. CNA is asserted high when none of the PHY ports are
receiving an incoming bias voltage. This circuit remains active during the power-
down mode.

CPS

Cable Power Status. CPS is normally connected to the cable power through a
400 k

resistor. This circuit drives an internal comparator that detects the presence

of cable power. This information is maintained in one internal register and is avail-
able to the LLC by way of a register read (see IEEE P1394a Draft 2.0 Standard for
a High Performance Serial Bus (Supplement)).

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

AGERE FW801

CTL1

CTL0

DDA

SSA

TPB0�

TPB0+

TPA0+

TPBIAS0

DDA

SSA

TPA0�

L
V

/
R

SYSCL

L
V

CNA

C/L

/IS

CPS

PIN #1 IDENTIFIER

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Signal Information

(continued)

Table 1. Signal Descriptions (continued)

Pin

Signal*

Type

Name/Description

CTL0

I/O

Control I/O. The CTLn signals are bidirectional communications control
signals between the PHY and the LLC. These signals control the passage
of information between the two devices. Bus-keeper circuitry is built into
these terminals.

CTL1

3, 4, 6, 7,

8, 9, 10,

D[0:7]

I/O

Data I/O. The Dn signals are bidirectional and pass data between the
PHY and the LLC. Bus-keeper circuitry is built into these terminals.

/ISO

Link Interface Isolation Disable Input (Active-Low). /ISO controls the
operation of an internal pulse differentiating function used on the
PHY-LLC interface signals, CTLn and Dn, when they operate as outputs.
When /ISO is asserted low, the isolation barrier is implemented between
PHY and its LLC (as described in Annex J of IEEE 1394-1995).
/ISO is normally tied high to disable isolation differentiation. Bus-keepers
are enabled when /ISO is high (inactive) on CTL, D, and LREQ. When
/ISO is low (active), the bus-keepers are disabled. Please refer to Agere's
application note AP98-074CMPR for more information on isolation.

LPS

Link Power Status. LPS is connected to either the V

supplying the

LLC or to a pulsed output that is active when the LLC is powered for the
purpose of monitoring the LLC power status. If LPS is inactive for more
than 1.2

�s and less than 25 �s, interface is reset. If LPS is inactive for

greater than 25

�s, the PHY will disable to save power. FW801 continues

its repeater function.

LREQ

Link Request. LREQ is an output from the LLC that requests the PHY to
perform some service. Bus-keeper circuitry is built into this terminal.

Powerdown. When asserted high, PD turns off all internal circuitry except
the bias-detect circuits that drive the CNA signal.

PLLV

Power for PLL Circuit. PLLV

supplies power to the PLL circuitry

portion of the device.

PLLV

Ground for PLL Circuit. PLLV

is tied to a low-impedance ground

plane.

Current Setting Resistor. An internal reference voltage is applied to a
resistor connected between R0 and R1 to set the operating current and
the cable driver output current. A low temperature-coefficient resistor
(TCR) with a value of 2.49 k

� 1% should be used to meet the

IEEE 1394-1995 standard requirements for output voltage limits.

/RESET

Reset (Active-Low). When /RESET is asserted low (active), a bus reset
condition is set on the active cable ports and the internal logic is reset to
the reset start state. An internal pull-up resistor, which is connected to
V

, is provided, so only an external delay capacitor in parallel with a

resistor is required to ensure that the capacitor is discharged when PHY
power is removed. This input is a standard logic buffer and can also be
driven by an open-drain logic output buffer.

Test Mode Control. SE is used during the manufacturing test and should
be tied to V

Test Mode Control. SM is used during the manufacturing test and should
be tied to V

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

8
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Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

SYSCLK

System Clock. SYSCLK provides a 49.152 MHz clock signal, which is
synchronized with the data transfers to the LLC.

TPA0+

Analog I/O Portn, Port Cable Pair A. TPAn is the port A connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.

TPA0

Analog I/O Portn, Port Cable Pair A. TPAn is the port A connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.

TPB0+

Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.

TPB0

Analog I/O Portn, Port Cable Pair B. TPBn is the port B connection to the twisted-

pair cable. Board traces from each pair of positive and negative differen-
tial signal pins should be kept matched and as short as possible to the
external load resistors and to the cable connector.

TPBIAS0

Analog I/O Portn, Twisted-Pair Bias. TPBIAS provides the 1.86 V nominal bias

voltage needed for proper operation of the twisted-pair cable drivers and
receivers and for sending a valid cable connection signal to the remote
nodes.

5, 16, 22,

Digital Power. V

supplies power to the digital portion of the device.

25, 33, 34

DDA

Analog Circuit Power. V

DDA

supplies power to the analog portion of the

device.

12, 15, 21,

40, 47

Digital Ground. All V

signals should be tied to the low-impedance

ground plane.

26, 27, 35,

SSA

Analog Circuit Ground. All V

SSA

signals should be tied together to a low-

impedance ground plane.

Crystal Oscillator. XI and XO connect to a 24.576 MHz parallel resonant
fundamental mode crystal. Although, when a 24.576 MHz clock source is
used, it can be connected to XI with XO left unconnected. The optimum
values for the external shunt capacitors are dependent on the specifica-
tions of the crystal used. The suggested values of 12 pF are appropriate
for crystal with 15 pF specified loads.

Signal Information

(continued)

Table 1. Signal Descriptions (continued)

Pin

Signal*

Type

Name/Description

* Active-low signals are indicated by "/" at the beginning of signal names, within this document.

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Electrical Characteristics

Table 3. Analog Characteristics

Parameter

Test Conditions

Symbol

Min

Typ

Max

Unit

Supply Voltage

Source power node

DD--SP

3.0

3.3

3.6

Differential Input Voltage

Cable inputs, 100 Mbits/s operation

ID--100

142

260

Cable inputs, 200 Mbits/s operation

ID--200

132

260

Cable inputs, 400 Mbits/s operation

ID--400

100

260

Cable inputs, during arbitration

ID--ARB

168

265

Common-mode Voltage

Source Power Mode

TPB cable inputs,

speed signaling off

1.165

2.515

TPB cable inputs,

S100 speed signaling on

CM--SP--100

1.165

2.515

TPB cable inputs,

S200 speed signaling on

CM--SP--200

0.935

2.515

TPB cable inputs,

S400 speed signaling on

CM--SP--400

0.532

2.515

Common-mode Voltage

Nonsource Power Mode*

* For a node that does not source power (see Section 4.2.2.2 in IEEE 1394-1995 Standard).

TPB cable inputs,

speed signaling off

1.165

2.015

TPB cable inputs,

S100 speed signaling on

CM--NSP--100

1.165

2.015

TPB cable inputs,

S200 speed signaling on

CM--NSP--200

0.935

2.015

TPB cable inputs,

S400 speed signaling on

CM--NSP--400

0.532

2.015

Receive Input Jitter

TPA, TPB cable inputs,

100 Mbits/s operation

1.08

TPA, TPB cable inputs,

200 Mbits/s operation

0.5

TPA, TPB cable inputs,

400 Mbits/s operation

0.315

Receive Input Skew

Between TPA and TPB cable inputs,

100 Mbits/s operation

0.8

Between TPA and TPB cable inputs,

200 Mbits/s operation

0.55

Between TPA and TPB cable inputs,

400 Mbits/s operation

0.5

Positive Arbitration

Comparator Input
Threshold Voltage

168

Negative Arbitration

Comparator Input
Threshold Voltage

�168

�89

Speed Signal Input

Threshold Voltage

200 Mbits/s

TH--S200

139

400 Mbits/s

TH--S400

266

445

Output Current

TPBIAS outputs

�5

2.5

TPBIAS Output Voltage

At rated I/O current

1.665

2.015

Current Source for

Connect Detect Circuit

�A

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Electrical Characteristics

(continued)

Table 5. Device Characteristics

* Device is capable of both differentiated and undifferentiated operation.

Parameter

Test Conditions

Symbol

Min

Typ

Max

Unit

Supply Current:

Port Active

= 3.3 V

135

High-level Output Voltage

Electrical Character-

istics (continued)

max, V

= min

� 0.4

Low-level Output Voltage

min, V

= max

0.4

High-level Input Voltage

CMOS inputs

0.7V

Low-level Input Voltage

CMOS inputs

0.2V

Pull-up Current,

/RESET Input

= 0 V

�A

Powerup Reset Time,

/RESET Input

= 0 V

Rising Input Threshold Voltage
/RESET Input

RST

1.1

1.4

Output Current

SYSCLK

@ TTL

�16

Control, data

@ CMOS

�12

CNA

�16

C/LKON

�2

Input Current,

LREQ, LPS, PD, SE, SM,
PC[0:2] Inputs

= V

or 0 V

�

�1

�A

Off-state Output Current,

CTL[0:1], D[0:7], C/LKON I/Os

= V

or 0 V

�

�5

�A

Power Status Input Threshold

Voltage, CPS Input

400 k

resistor

7.5

8.5

Rising Input Threshold Voltage*,

LREQ, CTLn, Dn

/2 + 0.3

/2 + 0.8

Falling Input Threshold Voltage*,

LREQ, CTLn, Dn

/2 � 0.8

/2 � 0.3

Bus Holding Current,

LREQ, CTLn, Dn

= 1/2(V

)

250

550

�A

Rising Input Threshold Voltage

LPS

LIH

0.24V

+ 1

Falling Input Threshold Voltage

LPS

LIL

0.24V

+ 0.2

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Internal Register Configuration

The PHY register map is shown below in Table 8.

Table 8. PHY Register Map for the Cable Environment

The meaning of the register fields within the PHY register map are defined by Table 9 below. Power reset values
not specified are resolved by the operation of the PHY state machines subsequent to a power reset.

Table 9. PHY Register Fields for the Cable Environment

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

0000

Physical_ID

0001

RHB

IBR

Gap_count

0010

Extended (7)

XXXXX

Total_ports

0011

Max_speed

XXXXX

Delay

0100

Link_active Contender

Jitter

Pwr_class

0101

Resume_int

ISBR

Loop

Pwr_fail

Timeout

Port_event Enab_accel Enab_multi

0110

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

0111

Page_select

XXXXX

Port_select

1000

Page_select

1111

Page_select

REQUIRED

XXXXX

RESERVED

Field

Size Type

Power Reset

Value

Description

Physical_ID

000000

The address of this node determined during self-identification. A
value of 63 indicates a malconfigured bus; the link will not transmit
any packets.

When set to one, indicates that this node is the root.

Cable power active.

RHB

Root hold-off bit. When set to one, the force_root variable is TRUE,
which instructs the PHY to attempt to become the root during the
next tree identify process.

IBR

Initiate bus reset. When set to one, instructs the PHY to set ibr
TRUE and reset_time to RESET_TIME. These values in turn
cause the PHY to initiate a bus reset without arbitration; the reset
signal is asserted for 166

�s. This bit is self-clearing.

Gap_count

Used to configure the arbitration timer setting in order to optimize
gap times according to the topology of the bus. See Section 4.3.6
of IEEE Standard 1394-1995 for the encoding of this field.

Extended

This field has a constant value of seven, which indicates the
extended PHY register map.

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Internal Register Configuration

(continued)

Table 9. PHY Register Fields for the Cable Environment (continued)

Field

Size Type Power Reset Value

Description

Total_ports

The number of ports implemented by this PHY. This count
reflects the number.

Max_speed

010

Indicates the speed(s) this PHY supports:
000

= 98.304 Mbits/s

001

= 98.304 and 196.608 Mbits/s

010

= 98.304, 196.608, and 393.216 Mbits/s

011

= 98.304, 196.608, 393.216, and 786.43 Mbits/s

100

= 98.304, 196.608, 393.216, 786.432, and

1,572.864 Mbits/s

101

= 98.304, 196.608, 393.216, 786.432, 1,572.864, and

3,145.728 Mbits/s

All other values are reserved for future definition.

Delay

0000

Worst-case repeater delay, expressed as 144 + (delay * 20) ns.

Link_active

Link Active. Cleared or set by software to control the value of
the L bit transmitted in the node's self-ID packet 0, which will be
the logical AND of this bit and LPS active.

Contender

See description.

Cleared or set by software to control the value of the C bit trans-
mitted in the self-ID packet. Powerup reset value is set by
C/LKON pin.

Jitter

000

The difference between the fastest and slowest repeater data
delay, expressed as (jitter + 1) * 20 ns.

Pwr_class

See description.

Power-Class. Controls the value of the pwr field transmitted in
the self-ID packet. See Section 4.3.4.1 of IEEE Standard 1394-
1995 for the encoding of this field. The power-class bits of the
self-ID packet do not have a default value.

Resume_int

Resume Interrupt Enable. When set to one, the PHY will set
Port_event to one if resume operations commence for any port.

ISBR

Initiate Short (Arbitrated) Bus Reset. A write of one to this bit
instructs the PHY to set ISBR true and reset_time to
SHORT_RESET_TIME. These values in turn cause the PHY to
arbitrate and issue a short bus reset. This bit is self-clearing.

Loop

Loop Detect. A write of one to this bit clears it to zero.

Pwr_fail

Cable Power Failure Detect. Set to one when the PS bit
changes from one to zero. A write of one to this bit clears it to
zero.

Timeout

Arbitration State Machine Timeout. A write of one to this bit
clears it to zero (see MAX_ARB_STATE_TIME).

Port_event

Port Event Detect. The PHY sets this bit to one if any of con-
nected, bias, disabled, or fault change for a port whose
Int_enable bit is one. The PHY also sets this bit to one if
resume operations commence for any port and Resume_int is
one. A write of one to this bit clears it to zero.

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Internal Register Configuration

(continued)

Table 9. PHY Register Fields for the Cable Environment (continued)

The port status page is used to access configuration and status information for each of the PHY's ports. The port is
selected by writing zero to Page_select and the desired port number to Port_select in the PHY register at address
0111

. The format of the port status page is illustrated by Table 10 below; reserved fields are shown shaded. The

meanings of the register fields with the port status page are defined by Table 11.

Table 10. PHY Register Page 0: Port Status Page

Field

Size Type

Power Reset

Value

Description

Enab_accel

Enable Arbitration Acceleration. When set to one, the PHY will
use the enhancements specified in clause 7.10 of 1394a specifica-
tion. PHY behavior is unspecified if the value of Enab_accel is
changed while a bus request is pending.

Enab_multi

Enable multispeed packet concatenation. When set to one, the link
will signal the speed of all packets to the PHY.

Page_select

000

Selects which of eight possible PHY register pages are accessible
through the window at PHY register addresses 1000

through

1111

, inclusive.

Port_select

000

If the page selected by Page_select presents per-port information,
this field selects which port's registers are accessible through the
window at PHY register addresses 1000

through 1111

, inclusive.

Ports are numbered monotonically starting at zero, p0.

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

1000

AStat

BStat

Child

Connected

Bias

Disabled

1001

Negotiated_speed

Int_enable

Fault

XXXXX XXXXX XXXXX

1010

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1011

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1100

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1101

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1110

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1111

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

REQUIRED

XXXXX

RESERVED

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Internal Register Configuration

(continued)

The meaning of the register fields with the port status page are defined by Table 11 below.

Table 11. PHY Register Port Status Page Fields

Field

Size Type

Power Reset

Value

Description

AStat

TPA line state for the port:
00

= invalid

= 1

= 0

= Z

BStat

TPB line state for the port (same encoding as AStat).

Child

If equal to one, the port is a child; otherwise, a parent. The
meaning of this bit is undefined from the time a bus reset is
detected until the PHY transitions to state T1: Child Hand-
shake during the tree identify process (see Section 4.4.2.2 in
IEEE Standard 1394-1995).

Connected

If equal to one, the port is connected.

Bias

If equal to one, incoming TPBIAS is detected.

Disabled

If equal to one, the port is disabled.

Negotiated_speed

000

Indicates the maximum speed negotiated between this PHY
port and its immediately connected port; the encoding is the
same as for they PHY register Max_speed field.

Int_enable

Enable port event interrupts. When set to one, the PHY will
set Port_event to one if any of connected, bias, disabled, or
fault (for this port) change state.

Fault

Set to one if an error is detected during a suspend or resume
operation. A write of one to this bit clears it to zero.

Agere Systems Inc.

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Internal Register Configuration

(continued)

The vendor identification page is used to identify the PHY's vendor and compliance level. The page is selected by
writing one to Page_select in the PHY register at address 0111

. The format of the vendor identification page is

shown in Table 12; reserved fields are shown shaded.

Table 12. PHY Register Page 1: Vendor Identification Page

The meaning of the register fields within the vendor identification page are defined by Table 13.

Table 13. PHY Register Vendor Identification Page Fields

The vendor-dependent page provides access to information used in manufacturing test of the FW801.

Address

Contents

Bit 0

Bit 1

Bit 2

Bit 3

Bit 4

Bit 5

Bit 6

Bit 7

1000

Compliance_level

1001

XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX XXXXX

1010

1011

Vendor_ID

1100

1101

1110

Product_ID

1111

REQUIRED

XXXXX

RESERVED

Field

Size Type

Description

Compliance_level

Standard to which the PHY implementation complies:
0 = not specified
1 = IEEE P1394a
Agere's FW801 compliance level is 1.
All other values reserved for future standardization.

Vendor_ID

The company ID or organizationally unique identifier (OUI) of the manufacturer
of the PHY. Agere's vendor ID is 00601D

. This number is obtained from the

IEEE registration authority committee (RAC). The most significant byte of
Vendor_ID appears at PHY register location 1010

and the least significant at

1100

Product_ID

The meaning of this number is determined by the company or organization that
has been granted Vendor_ID. Agere's FW801 product ID is 081401

. The most

significant byte of Product_ID appears at PHY register location 1101

and the

least significant at 1111

Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application.

June 2001

DS99-300CMPR-1 (Replaces DS99-300CMPR)

For additional information, contact your Agere Systems Account Manager or the following:
INTERNET:

http://www.agere.com

E-MAIL:

docmaster@micro.lucent.com

N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286

1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106)

ASIA PACIFIC: Agere Systems Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256

Tel. (65) 778 8833, FAX (65) 777 7495

CHINA:

Agere Systems (Shanghai) Co., Ltd., 33/F Jin Mao Tower, 88 Century Boulevard Pudong, Shanghai 200121 PRC
Tel. (86) 21 50471212, FAX (86) 21 50472266

JAPAN:

Agere Systems Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan
Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700

EUROPE:

Data Requests: DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148
Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot),

FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 3507670 (Helsinki),
ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)

Data Sheet, Rev. 1

June 2001

One-Cable Transceiver/Arbiter Device

FW801 PHY IEEE 1394A

Outline Diagrams

48-Pin TQFP

Dimensions are in millimeters.

5-2363 (F)

PIN #1

IDENTIFIER ZONE

7.00

� 0.20

9.00

� 0.20

7.00

� 0.20

1.60 MAX

SEATING PLANE

DETAIL A

0.08

1.40

� 0.05

0.50 TYP

0.05/0.15

DETAIL B

9.00

� 0.20

DETAIL B

0.19/0.27

0.08

0.106/0.200

DETAIL A

0.45/0.75

GAGE PLANE

SEATING PLANE

1.00 REF

0.25

Part Number FW801

Document Outline