S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Released
Register 0x028, 0x128, 0x228, 0x328, 0x428, 0x528, 0x628, 0x728:
SSTB Control
Bit
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Function
ZEROEN
TIMODE
RTIUIE
RTIMIE
PER5
TNULL
NOSYNC
LEN16
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0
0
1
0
0
This register controls the receive and transmit portions of the SSTB.
LEN16:
The section trace message length bit (LEN16) selects the length of the section trace
message to be 16 bytes or 64 bytes. When set high, a 16-byte section trace message is
selected. If set low, a 64-byte section trace message is selected.
NOSYNC:
The section trace message synchronization disable bit (NOSYNC) disables the writing of
the section trace message into the trace buffer to be synchronized to the content of the
message. When LEN16 is set high and NOSYNC is set low, the receive section trace
message byte with its most significant bit set will be written to the first location in the
buffer. When LEN16 is set low, and NOSYNC is also set low, the byte after the carriage
return/linefeed (CR/LF) sequence will be written to the first location in the buffer. When
NOSYNC is set high, synchronization is disabled, and the section trace message buffer
behaves as a circular buffer.
TNULL:
The transmit null bit (TNULL) controls the insertion of an all-zeros section trace identifier
message in the transmit stream. When TNULL is set high, the contents of the transmit
buffer is ignored and all-zeros bytes are provided to the TSOP block. When TNULL is set
low the contents of the transmit section trace buffer is sent to TSOP for insertion into the
J0/Z0 transmit section overhead byte. TNULL should be set high before changing the
contents of the trace buffer to avoid sending partial messages.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
162
PMC [ PMC-SIERRA, INC ]
