XRT79L71 Datasheet, PDF (210/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

XRT79L71
REV. P1.0.3
BIT NUMBER
NAME
4
F Bit Mask [4]/X
Bit # 2
3
F Bit Mask [3]/FEAC
Bit (C13)
PRELIMINARY
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1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
TYPE
R/W
R/W
DESCRIPTION
Transmit F-Bit Error - Bit 5/X Bit # 2:
The exact function of this register bit depends upon whether Bit 7
(TxOHSrc), within the "Test Register" (Direct Address = 0x110C)
is set to "1" or "0".
If "TxOHSrc" = 0 - Transmit F-Bit Error - Bit 5:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to transmit DS3 frames with an erred F
bit.
This F-bit corresponds with the 5th F-bit, within a given outbound
DS3 frame. The Frame Generator block will perform an XOR
operation with the contents of this bit-field and value of the 5th F-
bit. The results of this calculation will be written back into the 5th
F-bit position, within each outbound DS3 frame.
The user should set this bit-field to "0" for normal (e.g., un-erred)
operation.
If "TxOHSrc" = 1 - Insert Enable for X Bit # 2:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to externally accept an overhead bit and
insert it into the "X-Bit # 2" bit-field, within the outbound DS3
data-stream.
0 - Configures the Frame Generator to externally accept and
insert data into this overhead bit-field.
1- Configures the Frame Generator to NOT externally accept
and insert data into this overhead bit-field.
Transmit F-Bit Error - Bit 4/FEAC Bit (C13):
The exact function of this register bit depends upon whether Bit 7
(TxOHSrc), within the "Test Register" (Direct Address = 0x110C)
is set to "1" or "0".
If "TxOHSrc" = 0 - Transmit F-Bit Error - Bit 4:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to transmit DS3 frames with an erred F
bit.
This F-bit corresponds with the 4th F-bit, within a given outbound
DS3 frame. The Frame Generator block will perform an XOR
operation with the contents of this bit-field and value of the 4th F-
bit. The results of this calculation will be written back into the 4th
F-bit position, within each outbound DS3 frame.
The user should set this bit-field to "0" for normal (e.g., un-erred)
operation.
If "TxOHSrc" = 1 - Insert Enable for FEAC or C13 bit:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to externally accept an overhead bit and
insert it into the "FEAC (or C13)" bit-field, within the outbound
DS3 data-stream.
0 - Configures the Frame Generator to externally accept and
insert data into this overhead bit-field.
1- Configures the Frame Generator to NOT externally accept
and insert data into this overhead bit-field.
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