RELEASED
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Table 67. Grant/Data to iDS Frame Format
Meaning
Field
Size (bits)
Cell Data
48
Cell Data (includes LCS header with CRC over Tag only)
Credit
CRC or
8
CRC over the credit portion of the LCS header on DS1, reserved on DS0, DS2 --DS11
Reserved
Table 68. Control to xDS Link Format
Meaning
Field
Size (bits)
Reserved
1
ReadZero/
Token
Output Side: 1 if DS is to send all-0 cell into oFIFO or Crossbar
Input Side: 1 if DS now has a token to use for sending cells into the EPP
1
Rtag VLD
RTag
1
5
1 if the routing tag is valid
Routing Tag (only used by iEPP)
Read Req
Read Addr.
Write Req.
Write Addr.
Reserved
1
1 if read is to be performed from iQM or oQM
Read Address of cell to be read from iQM or oQM
1 if write is to be performed to iQM or oQM
Write Address of cell to be written into iQM or oQM
23
1
23
8
A.2 FRAME FORMATS - DATASLICE TO AND FROM CROSSBAR
Table 69 shows the frame format from the Dataslices to the Crossbar; Table 70 shows the frame format
used from the Crossbar to the Dataslices.
Table 69. Dataslice to Crossbar Frame Format
Field
Size (bits)
Meaning
synched
Cell VLD
RTagVLD
RTag
1
1
AIB synched
1 if the cell is valid
Routing Tag Valid
1
5
Routing Tag
Cell Data
CRC
48
8
Cell Data
CRC computed over previous 56 bits
318
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
