PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
Register 0745H: RCFP LCD Count Threshold
Bit
Type
Function
Default
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Unused
Unused
Unused
Unused
Unused
LCDC[10]
LCDC[9]
LCDC[8]
LCDC[7]
LCDC[6]
LCDC[5]
LCDC[4]
LCDC[3]
LCDC[2]
LCDC[1]
LCDC[0]
X
X
X
X
X
0
0
1
0
1
1
0
1
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Bit 8
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
LCDC[10:0]:
The LCDC[10:0] bits represent the number of consecutive cell periods the receive cell
processor must be out of cell delineation before loss of cell delineation (LCD) is declared.
Likewise, LCD is not deasserted until the receive cell processor is in cell delineation for the
number of cell periods specified by LCDC[10:0].
The default value of LCD[10:0] is 360, which translates to the following:
Table 10: Average STS-x cell period versus LCD integration period
Format
Average cell period
Default LCD integration
period
STS-48c
STS-12c
176.9 ns
707.5 ns
63.8 µs
254.7 µs
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
316
PMC [ PMC-SIERRA, INC ]
