á
PRELIMINARY
DS3 UNI FOR ATM
XRT7245
REV. 1.03
95
3.3.2.73
Tx PLCP A2 Byte Error Mask
This register allows the user to insert errors into the
A2 Byte of each outgoing PLCP Frame. The Transmit
PLCP Processor automatically performs the XOR op-
eration on the A2 byte of every outbound PLCP
frame with the contents of this register. Therefore, if
this register contains any “1s”, then errors will be
inserted into the A2 byte. If the user wishes to oper-
ate the Transmit PLCP in a normal mode (e.g., by
NOT inserting errors into the A2 byte), then he/she
must insure that this register contains the default val-
ue, 00h.
3.3.2.74
Tx PLCP B1 Byte (BIP-8) Error Mask
This register allows the user to insert errors into the
B1 Byte of each outgoing PLCP Frame. The Transmit
PLCP Processor automatically performs the XOR op-
eration on the B1 byte of every outbound PLCP
frame with the contents of this register. Therefore, if
this register contains any “1s”, then errors will be
inserted into the B1 byte. If the user wishes to oper-
ate the Transmit PLCP in a normal mode (e.g., by
NOT inserting errors into the B1 byte), then he/she
must insure that this register contains the default val-
ue, 00h.
3.3.2.75
Tx PLCP G1 Byte Register
Bit 4—TxFEBE Mask
This “Read/Write” bit-field allows the user to com-
mand the Transmit PLCP Processor to insert a value
of “0000” into the FEBE field of the G1 byte in the
outbound PLCP Frame.
Writing a “1” invokes this command (e.g., the FEBE
count - based on the Receive PLCP Processor is
overwritten, and a FEBE value of 0000 is used). Writ-
ing a “0” does not invoke this command.
For more information on the role of the FEBE field in
the G1 byte, please see Section 7.2.2.2.2.
Bit 3—Yellow Alarm
This “Read/Write” bit-field allows the user to com-
mand the Transmit PLCP to send a “Yellow Alarm” via
the G1 byte (within the outbound PLCP frame) to the
far-end Receive PLCP Processor.
Writing a “1” invokes this command (e.g., the Transmit
PLCP will force the “RAI” bit, within the G1 byte, to
“1”). Writing a “0” does not invoke this command.
Address = 49h, Tx PLCP A2 Byte Error Mask
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
A2 Byte Error Mask
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Address = 4Ah, Tx PLCP B1 Byte (BIP-8) Error Mask
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
B1 Byte Error Mask
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Address = 4Bh, Tx PLCP G1 Byte Register
B
IT
7
B
IT
6
B
IT
5
B
IT
4
B
IT
3
B
IT
2
B
IT
1
B
IT
0
Unused
TxFEBE Mask
Yellow Alarm
LSS(2)
LSS(1)
LSS(0)
RO
RO
RO
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0