S/UNI®-8x155 ASSP Telecom Standard Product Data Sheet
Released
Register 0x060, 0x160, 0x260, 0x360, 0x460, 0x560, 0x660, 0x760:
RXCP Configuration 1
Bit
Type
R/W
R/W
Function
DDSCR
HDSCR
Unused
Unused
Unused
HCSADD
Reserved
Unused
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
X
X
X
1
0
X
R/W
R/W
HCSADD:
6
4
2
The HCSADD bit controls the addition of the coset polynomial, x +x +x +1, to the HCS
octet prior to comparison. When HCSADD is a logic one, the polynomial is added, and the
resulting HCS is compared. When HCSADD is a logic zero, the polynomial is not added,
and the unmodified HCS is compared.
HDSCR:
43
HDSCR enables the self-synchronous x + 1 descrambler to continue running through the
bytes which should contain the ATM cell headers. When HSCR is set low, the
descrambling polynomial will function only over the ATM payload bytes. When HDSCR is
set high, the descrambling polynomial will function over all bytes, including the 5 ATM
header bytes. This function is available for use with PPP packets and flags which are
scrambled at the source to prevent the generation of “killer” sequences.
DDSCR:
43
The DDSCR bit controls the descrambling of the cell payload with the polynomial x + 1.
When DDSCR is set high, cell payload descrambling is disabled. When DDSCR is set low,
payload descrambling is enabled.
Reserved:
The reserved bits must be programmed to logic zero for proper operation.
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC- 2010299, Issue 2
219
PMC [ PMC-SIERRA, INC ]
