S/UNI®-JET Data Sheet
Released
Register 394H: TTB Expected Payload Type Label
Bit
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
Reserved
Reserved
Reserved
Reserved
Reserved
EXPLD[2]
EXPLD[1]
EXPLD[0]
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
0
0
0
EXPLD[2:0]
The EXPLD[2:0] bits contain the expected payload type label bits of the G.832 E3
Maintenance and Adaptation (MA) byte. The EXPLD[2:0] bits are compared with the
received payload type label extracted from the receive stream. A payload type label mismatch
(PLDM) is declared if the received payload type bits differs from the expected payload type.
If enabled, an interrupt is asserted upon declaration and removal of PLDM.
For compatibility with old equipment that inserts 000B for unequipped or 001B for equipped,
regardless of the payload type, the receive payload type label mismatch mechanism is based
on Table 24:
Table 24 TTB Payload Type Match Configurations
Expected
000
Received
000
Action
Match
000
000
001
001
001
XXX
000
Mismatch
Mismatch
Mismatch
Match
001
001
XXX
000
001
XXX
YYY
Match
Mismatch
Match
Match
Mismatch
XXX
XXX
XXX
XXX
Note
1. XXX, YYY = anything except 000B or 001B, and XXX is not equal to YYY.
Reserved
The reserved bits must be written to logic zero for proper operation.
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-1990267, Issue 3
227
PMC [ PMC-SIERRA, INC ]
