XRT79L71
REV. P1.0.3
PRELIMINARY
1 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC
á
182
TXDS3 M-BIT MASK REGISTER (DIRECT ADDRESS = 0X1135)
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
TxFEBEDat[2:0]
FEBE
Register
Enable
Tx P-Bit Error
TxM_Bit_Mask[2:0]
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
B
IT
N
UMBER
N
AME
T
YPE
D
ECRIPTION
7 - 5
TxFEBEDat[2:0]
R/W
Transmit FEBE Value:
These READ/WRITE bit-fields, along with "FEBE Register
Enable" permit the user to configure the Frame Generator block
to transmit FEBE values (to the remote terminal) based upon the
contents of these bit-fields.
If the user sets the "FEBE Register Enable" bit-field to "1", then
the Frame Generator block will write the contents of these bit-
fields into the FEBE bits, within each outbound DS3 frame.If the
user sets the "FEBE Register Enable" bit-field to "0" then these
register bits will be ignored.
4
FEBE Register Enable
R/W
Transmit FEBE (by Software) Enable:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to transmit FEBE values (to the remote
terminal) per register setting via the "TxFEBEDat[2:0]" bit-field.
This option provides the user with software control over the "out-
bound" FEBE values, within the DS3 data stream.
0 - Configures the Frame Generator block to transmit FEBE val-
ues based upon receive conditions, as determined by the com-
panion Frame Synchronizer block.
1 - Configures the Frame Generator block to write the contents of
the "TxFEBEDat[2:0]" bit-fields into the FEBE bits, within each
"outbound" DS3 frame.
3
Tx P-Bit Error
R/W
Transmit P-Bit Error:
This READ/WRITE bit-field permits the user to configure the
Frame Generator block to transmit DS3 frames with erred P-bits,
as indicated below.
0 - DS3 frames with correct P-bits are generated and transmitted
to the remote terminal equipment.
1 - DS3 frames with erred P-bits are generated and transmitted
to the remote terminal equipment.
2 - 0
TxM_Bit_Mask[2:0]
R/W
Transmit M-Bit Error:
These READ/WRITE bit-fields permit the user to configure the
Frame Generator block to transmit DS3 frames with erred M-bits.
These three (3) bit-fields correspond to the three M-bits, within
each outbound DS3 frame. The Frame Generator block will per-
form an XOR operation with the contents of these bit-fields and
the value of the three M-bits. The results of this calculation will
be written back into the M-bit positions within each outbound
DS3 frame.
The user should set these bit-fields to "0, 0, 0" for normal (e.g.,
un-erred) operation.