Datasheet

TSB12LV32 Data Formats
80
SGLS139B − October 2003 − Revised April 2004TSB12LV32-EP
The cable Phy sends one to three self-ID packets at the base rate (100 Mbps) during the self-ID phase of
arbitration or in response to a ping packet. The number of self-ID packets sent depends on the number of ports.
Figure 7−18, Figure 7−19, and Figure 7−20 show the format of the cable Phy self-ID packets. Inside the GRF,
the first received quadlet of a self-ID packet is always the header quadlet shown first in Figure 7−17 or
Figure 7−18.
3210 765411109815141312 1918 20 21 31302928272625242322
01 Phy_ID p2p1p0pwrrsvsp
1716
Logical inverse of first quadlet
L0 gap_cnt c mi
Figure 7−18. Phy Self-ID Packet #0 Format
3210 765411109815141312 1918 20 21 31302928272625242322
01 Phy_ID p10p9p8rsv
1716
Logical inverse of first quadlet
n(0)1 mrp3 p4 p5 p6 p7
Figure 7−19. Phy Self-ID Packet #1 Format
3210 765411109815141312 1918 20 21 31302928272625242322
01 Phy_ID reservedrsv
1716
Logical inverse of first quadlet
n(1)1 p11 p12 p13 p14 p15
Figure 7−20. Phy Self-ID Packet #2 Format
When there is only one node (i.e., one Phy/link pair) on the bus, following a bus reset, the GRF contains only
the header quadlet.
Example: If there are three 1394a-2000 compliant nodes on the bus, each with a Phy containing three or fewer
ports, the GRF of any one of the links is shown below. The FULLSID bit is assumed to be set in this example.
GRF CONTENTS DESCRIPTION
Header Header quadlet for self-ID Phy packet
Self-ID1 Self_ID quadlet for Phy #1
Self-ID1 (inverse) Logical inverse quadlet for self_ID of Phy #1
Self-ID2 Self_ID quadlet for Phy #2
Self-ID2 (inverse) Logical inverse quadlet for self_ID of Phy #2
Self-ID3 Self_ID quadlet for Phy #3
Self-ID3 (inverse) Logical inverse quadlet for self_ID of Phy #3
0000_0000_ACK Trailing acknowledgement quadlet
GRF contents (following a bus reset) with three nodes on the bus