SBPH400-3 datasheet(15/43 Pages) STMICROELECTRONICS

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SBPH400-3

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Figure 2.9

Remote confirmation packet format

The fields in the remote command and remote confirmation packets are interpreted as shown

in Table 2.4.

2.8

Link interface

2.8.1 Overview

The link interface in the SBPH400 operates as described in the IEEE P1394a proposal.

The SBPH400 implements an interface to a single 1394 link layer device, using the pins D[0:7],

Ctl[0:1], LREQ, SClk, LPS and LKON. The interface is scalable, using 2 data bits in parallel

per 100 Mbit/sec. This enables the clock rate of the signals at this interface to remain at 50

MHz.

Table 2.4

Remote Command and Confirmation packet fields

Field

Comment

phy_ID

Physical node identifier of the destination of the packet (type = 8)

Physical node identifier of the source of the packet (type = A16)

type

8 - remote command packet

A16 - remote confirmation packet

port

Identify the port for the command or confirmation. For values other than 0, 1 and 2, the

SBPH400 always responds with the OK bit set to zero in the confirmation packet.

current value of the Fault bit from SBPH400 register 10012 for the addressed port

current value of the Connected bit from SBPH400 register 10002 for the addressed port

current value of the Bias bit from SBPH400 register 10002 for the addressed port

current value of the Disabled bit from SBPH400 register 10002 for the addressed port

1 if the immediately preceding remote command was accepted by the SBPH400, zero

otherwise

cmnd

type = 8:-

0 - NOP

1 - Transmit TX_DISABLE_NOTIFY then disable the port

2 - Initiate suspend

4 - Clear the port’s Fault bit

5 - Enable port

6 - Resume port

type = A16:-

The cmnd value from the immediately preceding remote command packet

data

Current value of the SBPH400 register addressed by the immediately preceding Remote

Access packet (reserved and unimplemented fields and registers are returned as zero).

0 0

phy_ID

logical inverse of first quadlet

port

000

cmnd

000

type(A16)f c b d ok

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