XRT72L71 Datasheet, PDF (81/102 Pages) Exar Corporation – DS3 ATM UNI/CLEAR CHANNEL FRAMER

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XRT72L71
DS3 ATM UNI/CLEAR CHANNEL FRAMER
REV. 1.1.0
REGISTER 77
BIT
FUNCTION
7 Rx OAM FIFO Enable
6 Rx CRC10 Enable
5 User Cell Filter Discard
4 User Cell Filter Enable
3 Correction Thresh(1)
2 Correction Thresh(0)
1 Correction Enable
0 OAM Pass Through
TABLE 78: RX CP ADDITIONAL CONFIGURATION REGISTER
RX CP ADDITIONAL CONFIGURATION REGISTER
HEX ADDRESS: 0X4D
TYPE
DEFAULT
DESCRIPTION-OPERATION
0: The Receive OAM Cell Buffer functions as one cell (54 byte) buffer
1: The Receive OAM Cell Buffer functions as two-54-byte buffers.
R/W
0
NOTE: This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
0: CRC-10 Verification is NOT performed on received OAM cells.
1: CRC-10 Verification is performed on received OAM cells.
R/W
0
NOTE: This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
0: Incoming cells with header bytes matching the “User Cell Filtering” criteria
are written to the RxFIFO (all remaining cells are discarded).
1: Incoming cells with header bytes NOT matching the “User Cell Filtering”
criteria are discarded (all remaining cells are written to RxFIFO)
R/W
0
NOTES:
1. This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
2. This bit-field is only active of the “User Cell Filter” is enabled.
0: User cell filter is disabled. All user cells will be written to the RxFIFO.
1: User cell filter is enabled.
R/W
0
NOTE: This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
R/W
1
These two bits permit the user to specify the Correction Threshold that the
Receive Cell Processor will use, during HEC Byte Verification.
00: Sets Correction Threshold to “0”.
01: Sets Correction Threshold to “1”.
R/W
1
10: Sets Correction Threshold to “3”.
11: Sets Correction Threshold to “7”.
NOTE: This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
0: Disables header error correction.
1: Enables header error correction algorithm.
R/W
1
NOTE: This bit-field is only active if the XRT72L71 is operating in the “ATM
UNI” Mode.
0: OAM cells are subject to the Idle Cell and User Cell Filtering criteria.
1: OAM cells are NOT subject to the Idle Cell and User Cell Filtering criteria.
R/W
0
NOTE: This bit-field is only active if the XRT72L71 is operating in the
“ATM UNI” Mode.
77