IBM PowerPRS Q-64G
Packet Routing Switch
Preliminary
Table 3-19. Egress Idle Packet, FC Byte Field Descriptions
Bit(s)
Field Name
Memory Grant
Reserved
Description
0
1
Reports the status of the memory grant.
Reserved.
Reports the status of the subport grant type/priority flywheel:
000
001
010
011
100
Subport output queue grants, priority 0
Subport output queue grants, priority 1
Subport output queue grants, priority 2
Subport output queue grants, priority 3
Subport multicast grants
Subport Grant Type/
Priority Flywheel Status
2:4
See Section 3.3.6.3 Subport Grant Type/Priority Flywheel on page 37 for more information.
Reports the status of the subport grant port flywheel:
256-Gbps Configuration
512-Gbps Configuration
000
001
010
011
100
101
110
111
Ports 0 and 1
Ports 2 and 3
Ports 4 and 5
Ports 6 and 7
Ports 8 and 9
Ports 10 and 11
Ports 12 and 13
Ports 14 and 15
000
001
010
011
100
101
110
111
Ports 0, 1, 2, and 3
Ports 4, 5, 6, and 7
Ports 8, 9, 10, and 11
Ports 12, 13, 14, and 15
Ports 16, 17, 18, and 19
Ports 20, 21, 22, and 23
Ports 24, 25, 26, and 27
Ports 28, 29, 30, and 31
Subport Grant Port
Flywheel Status
5:7
See Section 3.3.6.4 Subport Grant Port Flywheel on page 38 for more information.
3.3.8 Egress Data Packet and Control Packet Format
The egress data packet and control packet format for the PowerPRS Q-64G 16-Gbps configuration is
presented in Figure 3-6. The packet qualifier byte (H0) is described in Tables 3-20 and 3-21. Header bytes H1
and H2 of egress data packets and control packets are identical to those of egress idle packets (see Tables
3-12 through 3-16).
Figure 3-6. Egress 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.
Functional Description
prsq-64g.01.fm
December 20, 2001
Page 44 of 199
IBM [ IBM ]
