TSB12C01APZ datasheet(39/59 Pages) TI

39 / 59 page

4–9

4.8

Receive Self-ID

The format of the receive self-ID packet is shown in Figure 4–11. The first quadlet is the packet header with

the special tCode of Eh. The quadlets that follow are a concatenation of all received self-ID packets. The

last quadlet contains the final packet status. See IEEE 1394-1995 standard, paragraph 4.3.4.1, for

additional information about self-ID packets.

1 2 3

5 6 7

9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

tCode

priority

spd

ackSent

Self-ID Packet Data

Figure 4–11. Receive Self-ID Format

Table 4–11. Isochronous-Receive Functions

FIELD NAME

DESCRIPTION

tCode

This field carries the transaction code for this packet (tCode = Eh).

priority

This field carries the priority level for this packet.

Self-ID packet data

This field contains a concatenation of all the Self-ID packets received.

spd

This field indicates the speed at which this packet was sent (00 = 100 Mbits/s, 01 = 200 Mbits/s,

10 = 400 Mbits/s, and 11 is undefined).

ackSent

This field holds the acknowledge sent by the receiver for this packet.

TSB12C01APZ 数据表(PDF) 39 Page - Texas Instruments