XRT79L71_1 Datasheet, PDF (235/434 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
7-5
Unused
4
GFC Extraction Enable
3
HEC Byte Correction
Enable
TYPE
R/O
R/W
R/W
DESCRIPTION
GFC (Generic Flow Control) Extraction Enable:
This READ/WRITE bit-field permits the user to configure the
Receive ATM Cell Processor block to output the contents of the
GFC Nibble (within each incoming ATM Cell) via the Receive
GFC Value Output port.
0 - Configures the Receive ATM Cell Processor block to NOT
output the contents of the GFC Nibble (within each incoming
ATM cell) via the Receive GFC Value Output port.
1 - Configures the Receive ATM Cell Processor block to output
the contents of the GFC Nibble (within each incoming ATM cell)
via the Receive GFC Value Output port.
HEC Byte Correction Enable:
This READ/WRITE bit-field permits the user to enable Correction
Mode operation for the Receive ATM Cell Processor block.
If the user implements this configuration option, then the
Receive ATM Cell Processor block will transition into either the
Correction Mode or the Detection Mode (as Receive Conditions
warrant).
If the Receive ATM Cell Processor block is operating in the Cor-
rection Mode then it will correct any cells that contain Single-Bit
Header byte errors.
In contrast, if the Receive ATM Cell Processor block is operating
in the Detection Mode, then it will unconditionally discard any
cells that contain Header byte errors (Single-Bit or Multi-Bit
errors).
If the user does not implement this feature, then the Receive
ATM Cell Processor block will only be capable of operating in the
Detection Mode.
0 - Disables the Correction Mode. In this setting, the Receive
ATM Cell Processor block will only operate in the Detection
Mode.
1 - Enables the Correction Mode. In this setting, the Receive
ATM Cell Processor block will transition into and out of the Cor-
rection Mode or Detection Mode as receive conditions warrant.
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