Released
PMC-Sierra, Inc.
PM9311/2/3/5 ETT1™ CHIP SET
Data Sheet
PMC-2000164
ISSUE 3
ENHANCED TT1™ SWITCH FABRIC
Table 5. LCS Format from Switch to Linecard
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Grnt
Valid
Label_1 [13:7]
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Label_1 [6:0]
Type_1
[3]
Grant Field
Type_1 [2:0]
Seq_Num [9:5]
Seq_Num [4:0]
Payload
Valid
Label_2 [13:12]
Label_2 [11:4]
Payload
Field
Label_2 [3:0]
Type_2 [3:0]
CRC-16 [15:8]
CRC-16 [7:0]
Payload Data
CRC Field
Payload
Bytes 8-71 or
8-83
Table 6. Definitions of LCS Fields from Switch to Linecard
Field
Size (bits)
Definition
Grnt Valid
Label_1
1
14
4
Indicates that grant field is valid (Grant Label_1 and Sequence Number).
Label for credit (e.g. QID/mcast-label/TDM-label).
Type_1
Segment type for credit (e.g. TDM).
Seq_Num
Payload Valid
Label_2
10
1
Sequence Number associated with grant.
Indicates whether the egress payload is valid (Payload Label_2 and Payload Data).
Label for egress payload (e.g. ingress port identifier).
Segment type for egress payload (e.g. Control Packet).
14
4
Type_2
a
CRC-16
16
16-bit CRC calculated over complete 64-bit prepend.
Payload Data
64 or 76
bytes
Payload Data
a. See Section 1.6.4.1 “Use of CRC-16 Field” on page 73 for details of CRC calculation and Section 3.4.2.2 “Reset and
Control” on page 169, bit 4.
66
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
PMC [ PMC-SIERRA, INC ]
