TSB41BA3APFP datasheet(56/66 Pages) TI

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TSB41BA3A

IEEE 1394b THREEPORT CABLE TRANSCEIVER/ARBITER

SLLS618B − JUNE 2004 − REVISED AUGUST 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

PRINCIPLES OF OPERATION (1394B INTERFACE)

status transfer (continued)

PHY status transfers use the PINT terminal to serially send status information to the LLC as shown in Figure 25.

PHY status transfers (see Table 34) can occur at any time during normal operation. The PHY uses the

PHY_INTERRUPT PHY status transfer when required to interrupt the LLC due to a configuration timeout, a

cable power failure, a port interrupt, or an arbitration timeout. When transferring PHY register contents, the PHY

uses either the solicited or the unsolicited register read status transfer. The unsolicited register 0 contents are

passed to the LLC only during initialization of the serial bus. After any PHY-link interface initialization, the PHY

sends a PHY status transfer indicating whether or not a bus reset occurred during the inactive period of the

PHY-link interface. If the PHY receives an illegal request from the LLC, then the PHY issues an

INTERFACE_ERROR PHY status transfer.

Each cell represents one clock sample time, and n is the number of bits in the request stream.

LR1

LR2

LR3

LR (n-2)

LR0

LR (n-1)

Figure 25. PINT (PHY Interrupt) Stream

Table 34. PHY Status Transfer Encoding

PI[1:3]

NAME

DESCRIPTION

NUMBER OF BITS

000

NOP

No status indication

001

PHY_INTERRUPT

Interrupt indication: configuration timeout, cable power failure, port event

interrupt, or arbitration state machine timeout

010

PHY_REGISTER_SOL

Solicited PHY register read

011

PHY_REGISTER_UNSOL

Unsolicited PHY register read

100

PH_RESTORE_NO_RESET

PHY-link interface initialized; no bus resets occurred

101

PH_RESTORE_RESET

PHY-link interface initialized; a bus reset occurred

110

INTERFACE_ERROR

PHY received illegal request

111

Reserved

Most PHY status transfers are 5 bits long. The transfer consists of a start bit (always 1), followed by a request

type (see Table 34), and lastly followed by a stop bit (always 0). The only exception is when the transfer of a

additional information of the register address and the data contents of the register (see Table 35).

Table 35. Register Read (Solicited and Unsolicited) PHY Status Transfer Encoding

BIT(s)

NAME

DESCRIPTION

Start bit

Indicates the beginning of the transfer (always 1)

1−3

Request type

A 010 or a 011 indicates a solicited or unsolicited register contents transfer

4−7

Address

Identifies the address of the PHY register whose contents are being transferred

8−15

Data

The contents of the register specified in bits 4 through 7

Stop bit

Indicates the end of the transfer (always 0)

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