IBM PowerPRS Q-64G
Preliminary
Packet Routing Switch
Figure 3-3. Ingress Data Packet and Control Packet Format
High Channel Packet
Byte 0
H0
Byte 1
H1
Byte 2
H2/D
Byte 3
D
Byte 4
D
Byte 5
D
Byte 6
D
Byte 7
D
Byte 8
D
Byte 9
D
Master LU
D
D
D
D
D
D
D
D
D
D
7 Slave LUs
Low Channel Packet
Byte 0
H0
Byte 1
H1
Byte 2 Byte 3
Byte 4
D
Byte 5
D
Byte 6
D
Byte 7
D
Byte 8
D
Byte 9
D
H2/D
D
Master LU
7 Slave LUs
Notes:
D
D
D
D
D
D
D
D
D
D
1. H0, H1, and H2 are packet header bytes. H2 exists only in the 512-Gbps configuration.
2. D is user data.
Table 3-4. Ingress Data Packet and Control Packet, Byte H0
Information Carried
Byte
Bit 0
Bit 1
Bits 2:3
Bit 4
Bit 5
Bits 6:7
H0
Extended bitmap
Parity
Protection
Best effort
Send grant
Packet priority
Packet priority
(high channel)
H0
Extended bitmap
Parity
Protection
Best effort
Subport grant
(low channel)
prsq-64g.01.fm
December 20, 2001
Functional Description
Page 33 of 199
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