IBM PowerPRS Q-64G
Packet Routing Switch
Preliminary
Table 3-2. Ingress Idle Packet, Byte H0 Field Descriptions (Page 2 of 2)
Bit(s)
Field Name
Description
Identifies the idle packet color for switchover support:
00
01
Blue
Red
4:5
Color
Others Reserved
Reports the status of the subport grant type/subport flywheel:
000
001
010
011
100
Subport output queue grants, subport 0
Subport output queue grants, subport 1
Subport output queue grants, subport 2
Subport output queue grants, subport 3
Subport multicast grants
Subport Grant
Type/Subport
Flywheel Status
(high channel)
See Section 3.3.2.1 Subport Grant Type/Subport Flywheel on page 30 for more information.
6:7
Reports the status of the grant priority flywheel:
00
01
10
11
Priority 0
Priority 1
Priority 2
Priority 3
Grant Priority
Flywheel Status
(low channel)
See Section 3.3.2.2 Grant Priority Flywheel on page 30 for more information.
Note: On the high channel, bits 0, 6, and 7 of byte H0 carry the three-bit subport grant type/subport flywheel status. On the low chan-
nel, bit 0 is reserved, and bits 6:7 carry the subport grant type/subport flywheel status.
Table 3-3. Ingress Idle Packet, Bytes H1, H2, SCC, and FC
Information Carried
Byte
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Subport
Subport
Subport
Subport
Subport
Subport
Subport
Subport
H1
outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue
(high and low
channel)
grant:
subport 0,
priority 0
grant:
subport 0,
priority 1
grant:
subport 0,
priority 2
grant:
subport 0,
priority 3
grant:
subport 2,
priority 0
grant:
subport 2,
priority 1
grant:
subport 2,
priority 2
grant:
subport 2,
priority 3
Subport
Subport
Subport
Subport
Subport
Subport
Subport
Subport
H2
outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue outputqueue
(high and low
channel)
grant:
subport 1,
priority 0
grant:
subport 1,
priority 1
grant:
subport 1,
priority 2
grant:
subport 1,
priority 3
grant:
subport 3,
priority 0
grant:
subport 3,
priority 1
grant:
subport 3,
priority 2
grant:
subport 3,
priority 3
SCC
(high and low
channel)
SSC data:
bit 0
SCC data:
bit 1
SCC data:
bit 2
SCC data:
bit 3
SCC data:
bit 0
SCC data:
bit 1
SCC data:
bit 2
SCC data:
bit 3
Subport
multicast
grant:
Subport
multicast
grant:
Subport
multicast
grant:
Subport
multicast
grant:
FC
Send grant: Send grant: Send grant: Send grant:
priority 0 priority 1 priority 2 priority 3
(high and low
channel)
priority 0
priority 1
priority 2
priority 3
3.3.4 Ingress Data Packet and Control Packet Format
The ingress data packet and control packet format for the PowerPRS Q-64G 16-Gbps configuration is
presented in Figure 3-3. The packet qualifier byte (H0) is described in Tables 3-4 and 3-5.
Functional Description
Page 32 of 199
prsq-64g.01.fm
December 20, 2001
IBM [ IBM ]
