
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
138
Register 0004H: SP9953 Transmit Configuration 1
Bit
Type
Function
Default
Bit 15
Unused
Bit 14
Unused
Bit 13
TOHI_RESET[4]
Bit 12
TOHI_RESET[3]
Bit 11
TOHI_RESET[2]
Bit 10
TOHI_RESET[1]
Bit 9
Unused
Bit 8
Unused
Bit 7
Unused
Bit 6
R/W
ACMP_SAMPLE_DIS
0
Bit 5
R/W
Unused
0
Bit 4
R/W
TXFPI_DISABLE
0
Bit 3
R/W
Reserved
0
Bit 2
R/W
Reserved
0
Bit 1
R/W
TDS
0
Bit 0
R/W
Reserved
0
The Transmit Configuration 1 Register is provided at SP9953 Read/Write Address 04H.
TDS
The transmit disable scrambling (TDS) bit disables the scrambling of the output data
stream. When a logic 1 is written to TDS, the output data stream is not scrambled. When a
logic 0 is written to TDS, the output data stream is scrambled.
TXFPI_DISABLE
The TXFPI_DISABLE bit is used to kill activity on the line side TXFPI input. When set to
1, the TXFPI input is ignored. When set to 0, TXFPI operates normally.
ACMP_SAMPLE_DIS
The ACMP sample disable bit (ACMP_SAMPLE_DIS) is used to disable the sampling of
the ACMP input with the AFP external input. When ACMP_SAMPLE_DIS is set to 0, the
ACMP is only used internally after an AFP pulse. When the bit is set to 1, ACMP is used
without an external AFP pulse.TOHI_RESET[1:4]
The TOHI_RESET[1:4] register bits are used to reset the transmit transport overhead top-
level blocks. When TOHI_RESET[x] is set to 1, TOHI[x] is kept into a reset mode. When
TOHI_RESET[x] is set to 0, the TOHI[x] block operates normally.