
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
382
Register 20A1H (Indirect Register 00H): TTTP Section Trace Configuration
Bit
Type
Function
Default
Bit 15
Unused
Bit 14
Unused
Bit 13
Unused
Bit 12
Unused
Bit 11
Unused
Bit 10
Unused
Bit 9
Unused
Bit 8
Unused
Bit 7
Unused
Bit 6
Unused
Bit 5
Unused
Bit 4
Unused
Bit 3
Unused
Bit 2
R/W
ZEROEN
0
Bit 1
R/W
BYTEEN
0
Bit 0
R/W
LENGTH16
0
LENGTH16
The message length (LENGTH16) bit selects the length of the trial trace message to be
transmitted. When LENGTH16 is set to logic 1, the length of the trial trace message is 16
bytes. When LENGTH16 is set to logic 0, the length of the trial trace message is 64 bytes.
BYTEEN
The single byte message enable (BYTEEN) bit enables the single byte trial trace message.
When BYTEEN is set to logic 1, the length of the trial trace message is 1 byte. When
BYTEEN is set to logic 0, the length of the trial trace message is determined by
LENGTH16. BYTEEN has precedence over LENGTH16.
ZEROEN
The all zero message enable (ZEROEN) bit enables the transmission of an all zero trial
trace message. When ZEROEN is set to logic 1, an all zero message is transmitted. When
ZEROEN is set to logic 0, the RAM message is transmitted. The enabling and disabling of
the all zero trial trace message is not done on message boundary since the receiver is
required to perform filtering on the message.