XRT79L71 Datasheet, PDF (203/441 Pages) Exar Corporation – 1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC

áç
PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
XRT79L71
REV. P1.0.3
TXDS3 F-BIT MASK # 3 REGISTER (DIRECT ADDRESS = 0X1138)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
F_Bit Mask
[15]/FEBE
Bit #3 (C43)
F_Bit Mask
[14]/FEBE
Bit #2 (C42)
F_Bit Mask
[13]/FEBE
Bit #1 (C41)
F_Bit Mask
[12]
F_Bit Mask
[11]/CP
Bit #3(C33)
F_Bit Mask
[10]/CP
Bit #2(C32)
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
BIT 1
F_Bit Mask
[9]/CP
Bit #1(C31)
R/W
0
BIT 0
F_Bit Mask
[8]
R/W
0
BIT NUMBER
NAME
7
F Bit Mask[15]/FEBE
Bit # 3 (C43)
TYPE
R/W
DESCRIPTION
Transmit F-Bit Error - Bit 16/FEBE Bit # 3 (C43):
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 16:
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 16th 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
16th F-bit. The results of this calculation will be written back into
the 16th 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 FEBE Bit # 3 or C43 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 "FEBE Bit # 3 (or C43)" 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.
191