XRT79L71 Datasheet, PDF (199/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

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PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
BIT NUMBER
NAME
6
F Bit Mask [22]/UDL
Bit # 5 (C62)
TYPE
R/W
DESCRIPTION
Transmit F-Bit Error - Bit 23/UDL Bit # 5 (C62):
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 23:
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 23rd F-bit, within a given out-
bound DS3 frame. The Frame Generator block will perform an
XOR operation with the contents of this bit-field and value of the
23rd F-bit. The results of this calculation will be written back into
the 23rd 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 UDL Bit # 5 or C62 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 "UDL Bit # 5 (or C62)" bit-fields, within the out-
bound DS3 data-stream.
0 - Configures the Frame Generator to externally accept and
insert data into this overhead bit-field.
5
F Bit Mask [21]/UDL
Bit # 4 (C61)
1- Configures the Frame Generator to NOT externally accept
and insert data into this overhead bit-field.
R/W Transmit F-Bit Error - Bit 22/UDL Bit # 4 (C61):
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 22:
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 22nd F-bit, within a given out-
bound DS3 frame. The Frame Generator block will perform an
XOR operation with the contents of this bit-field and value of the
22nd F-bit. The results of this calculation will be written back into
the 22nd 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 UDL Bit # 4 or C61 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 "UDL Bit # 4 (or C61)" bit-fields, within the out-
bound 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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