PRELIMINARY
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
3.2 INPUT DATASLICE QUEUE MEMORY ALLOCATION WITH EPP
The following table lists the raw addresses within input Dataslice queue memory for all input queues
(VOQs) managed by the iEPP. These addresses apply to each input Dataslice in the port; to read or write
a complete cell in input Dataslice queue memory, the raw address must be translated into OOB address
offsets, and then those offsets should be read/written for each Dataslice.
Priority is the lower 2 bits of the traffic type for Unicast or Multicast queues; Port is 5 bits, and Subport is 2
bits. “x” is a single bit that can be 0 or 1, used to denote offsets within queues. “yy” can only be 00, 01, or
10, and is used to denote offsets within queues that are 24 or 96 cells in length.
Table 21. Input Dataslice Queue Memory Allocation
Total #
Traffic
Type
Type of Ingress Queue
Dataslice Queue Mem Address
Mapping
Raw Address
Range
of
Linecard
size
Queues
either (OC-48c
egress port)
0,Priority,Egress Port,
Egress Subport,xxxx
Unicast
Unicast
16
64
512
128
0x0000-0x1FFF
either (OC-192c
egress port)
0,Priority,Egress Port,xxxxxx
10000,yy,xxxxx,Priority
0x0000-0x1FFF
0x2000-0x217F
Multicast
TDM
either
96
24
96
8
4
4
1
4
1
OC-48c
OC-192c
OC-48c
OC-192c
1000011,yy,xxx,Ingress Subport 0x2180-0x21DF
1000011,yy,xxxxx 0x2180-0x21DF
100001111,Ingress Subport,xxx 0x21E0-0x21FF
100001111,00,xxx 0x21E0-0x21E7
TDM
CPU CP
CPU CP
8
Each raw address given above is for a 48-bit word in Dataslice queue memory. In order to access the
memory with OOB, a raw address must be converted into two OOB address offsets because OOB
accesses are 32-bit. The following formula is used:
oob_offset_16_MSBs = 0x40000 | (raw_address << 3)
oob_offset_32_LSBs = 0x40000 | (raw_address << 3) | 0x4
3.3 OUTPUT DATASLICE QUEUE MEMORY ALLOCATION WITH EPP
The following table lists the raw addresses within output Dataslice queue memory for all output queues
(VIQs) managed by the oEPP. These addresses apply to each output Dataslice in the port; to read or write
a complete cell in output Dataslice queue memory, the raw address must be translated into OOB address
offsets, and then those offsets should be read/written for each Dataslice.
162
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
