Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Figure 17. The Four Priorities
0,0
2
1b
0
1c
3
1d
7
Priority 3
Priority 2
0,0
2
1b
0,0
2
Priority 1
0
0,0
2
0,1
O1Cb-48c a
1c
1a
Priority 0
0
3
1d
7
OC-48 a
1c
1a
1b
1c
1d
3
1d
7
0
OC-48 a
0,2
3
OC-48c 0
1a
1b
1c
1d
1b
1c
1d
32d
0
0,3
7
0,0
0,1
0,2
0,3
32d
0
1a
5
1b
2
32d
0
1a
5
2a
2b
2c
2d
31,3
0
1a
5
1b
OC-48c b
2a
2b
2c
2d
2
0,0
5
1b
OC-48 b
2a
2b
2c
2d
32d
2
2
0,1
2
OC-48 b
1,0
1,1
1,2
1,3
OC-48c 1
32d
2
32d
2
1a
0
1b
12
1a
0
31,3
2
1a
0
1b
32a
OC-48c c
12
1a
0
1b
OC-48 c
12
1b
32a
OC-48 c
32b
32c
32d
32d
7
12
32a
32b
32c
32d
OC-48c 2
32d
7
31,0
31,1
31,2
31,3
32b
32c
32d
1a
15
1b
8
32d
7
1a
15
1b
32d
7
1a
15
OC-48c d
8
1a
1b
OC-48 d
32d
3
15
1b
8
OC-48 d
OC-48c 3
32d
3
8
32d
3
32d
3
1.3.3.4 Multiplexing Scheduler Requests and Grants.
Figure 16 and Figure 17 imply that the ETT1 Scheduler can accept requests from each of the 32 ports
where a request specifies one of 128 output channels. This is not the case; the Scheduler only maintains
information on a port basis, not a subport basis.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
45