XRT79L71_1 Datasheet, PDF (343/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

REV. 1.0.0
XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT NUMBER
NAME
1
COSET Polynomial
Addition
0
Regenerate HEC Byte
Enable
TYPE
R/W
R/W
DESCRIPTION
COSET Polynomial Addition:
This READ/WRITE bit-field permits the user to configure the
Transmit ATM Cell Processor block to modulo-add the COSET
Polynomial (e.g., x^6 + x^4 + x^2 + 1) to the HEC byte value,
within each Outbound ATM cell.
0 - Configures the Transmit ATM Cell Processor block to NOT
modulo-add the COSET Polynomial to the HEC byte within each
outbound ATM cell.
1 - Configures the Transmit ATM Cell Processor block to mod-
ulo-add the COSET Polynomial to the HEC byte within each out-
bound ATM cell.
Regenerate HEC Byte Enable:
This READ/WRITE bit-field permits the user to configure the
Transmit ATM Cell Processor block to automatically re-compute
and insert a new HEC byte into each ATM cell (that it receives
from the Transmit UTOPIA Interface block) that contains an
uncorrectable HEC byte.
0 - Does not configure the Transmit ATM Cell Processor block to
compute and insert a new HEC byte into ATM cells that contains
an uncorrectable HEC Byte error.
1 - Configures the Transmit ATM Cell Processor block to com-
pute and insert a new HEC byte into ATM cells that contains an
uncorrectable HEC Byte error.
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