RELEASED
PM7351 S/UNI-VORTEX
DATA SHEET
PMC-1980582
ISSUE 5
OCTAL SERIAL LINK MULTIPLEXER
EXTCRCPR:
The EXTCRCPR bit is used to force the value of the Extract CRC-32
accumulation register to its preset value. If EXTCRCPR is set to logic 1, the
Insert CRC-32 accumulation register is kept to its preset value. If
EXTCRCPR is set to logic 0, CRC-32 verification is performed on extracted
cells. The CRC-32 calculations are performed on the bytes being read from
the location of the Microprocessor Cell Data register corresponding to the
payload of extract cells.
Due to synchronization delays, a read of the Microprocessor Cell Buffer Data
register should not be initiated until two REFCLK periods after completion of
the write of this bit.
EXTCRCCHK:
The EXTCRCCHK bit is used to enable the CRC-32 field check. Setting this
bit to logic 1 will cause the S/UNI-VORTEX to verify if the value of the Extract
CRC-32 Accumulation register is equal to the expected CRC-32 remainder
polynomial at the end of a cell read access by the microprocessor. If
EXTCRCCHK is logic 1, the EXTCRCERRI bit will be set to logic 1 if the
CRC-32 is incorrect.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
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PMC [ PMC-SIERRA, INC ]
