
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
185
Register 0055H: RRMP Receive SSM
Bit
Type
Function
Default
Bit 15
R/W
BYTESSM
0
Bit 14
R/W
FLTRSSM
0
Bit 13
Unused
X
Bit 12
Unused
X
Bit 11
Unused
X
Bit 10
Unused
X
Bit 9
Unused
X
Bit 8
Unused
X
Bit 7
R
SSMV[7]
X
Bit 6
R
SSMV[6]
X
Bit 5
R
SSMV[5]
X
Bit 4
R
SSMV[4]
X
Bit 3
R
SSMV[3]
X
Bit 2
R
SSMV[2]
X
Bit 1
R
SSMV[1]
X
Bit 0
R
SSMV[0]
X
These register bits are only valid for master slices. For slave slices, they should be ignored or
written to their default values.
SSMV[7:0]
The synchronization status message value (SSMV[7:0]) bits represent the extracted S1
nibble (or byte). When filtering is enabled via the FLTRSSM register bit, SSMV is updated
when the same S1 nibble (or byte) is received for eight consecutive frames. When filtering
is disabled, SSMV is updated every frame.
FLTRSSM
The filter synchronization status message (FLTRSSM) bit enables the filtering of the SSM
nibble (or byte). When FLTRSSM is set to logic 1, the SSM value is updated when the
same SSM is received for eight consecutive frames. When FLTRSSM is set to logic 0, the
SSM value is updated every frame.
BYTESSM
The byte synchronization status message (BYTESSM) bit extends the SSM from a nibble to
a byte. When BYTESSM is set to logic 1, the SSM is a byte and bits 1 to 8 of the S1 byte
are considered. When BYTESSM is set to logic 0, the SSM is a nibble and only bits 5 to 8
of the S1 byte are considered.