PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
Register 0045H: RRMP Receive SSM
Bit
Type
Function
Default
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
R/W
R/W
BYTESSM
FLTRSSM
Unused
0
0
Unused
Unused
Unused
Unused
Bit 8
Unused
Bit 7
R
R
R
R
R
R
R
R
SSMV[7]
SSMV[6]
SSMV[5]
SSMV[4]
SSMV[3]
SSMV[2]
SSMV[1]
SSMV[0]
X
X
X
X
X
X
X
X
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
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
disable, 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.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
144
PMC [ PMC-SIERRA, INC ]
