IBM PowerPRS Q-64G
Packet Routing Switch
Preliminary
2.2 Internal Structure
The internal structure of the PowerPRS Q-64G is shown in Figure 2-2, which depicts a single
PowerPRS Q-64G operating without speed expansion. Figure 2-3 shows the structure of a subswitch
element.
I
Figure 2-2. PowerPRS Q-64G Block Diagram
0
0
16 × 16
Subswitch
Element
A
0
Output
Controllers
Unilink
0 to 15
0
(high)
15
16
15
16
Unilink
0 to 15
Input
Controllers
15
16 × 16
Subswitch
Element
B
15
Credit Table
(low)
31
0
31
0
Output Queue
Scheduler
16 × 16
Subswitch
Element
C
16
31
16
(high)
15
16
15
16
Unilink
16 to 31
Input
Controllers
Output
Controllers
Unilink
16 to 31
16 × 16
Subswitch
Element
D
31
(low)
31
31
Ingress Flow
Egress Flow
Sequencer
Architecture
prsq-64g.01.fm
December 20, 2001
Page 16 of 199
IBM [ IBM ]
