XRT79L71
PRELIMINARY
135
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
The procedure for transmitting either of these types of LOS Patterns is presented below.
Transmitting an All Zeros LOS Pattern
The user can configure the Transmit DS3/E3 Framer block to transmit an LOS pattern by transmitting an All
Zeros pattern. The user can accomplish this by executing the following steps.
STEP 1 - Set Bit 4 (TxLOS Pattern) within the Transmit DS3 Pattern Register, to "0", as illustrated
below.
NOTE:
This step configures the Transmit DS3/E3 Framer block to transmit an All Zeros pattern, whenever the user
configures it to transmit the LOS Pattern.
STEP 2 - Set Bit 3 (TxLOS) within the Transmit DS3 Configuration Register to "1" as depicted below.
Once the user executes this step, then the Transmit DS3/E3 Framer block will override all of the outbound DS3
data payload and overhead bits, with an All Zeros pattern.
NOTE: When this bit is set, it overrides all of the other bits in this register.
Transmitting an All Ones LOS Pattern
The user can also configure the Transmit DS3/E3 Framer block to transmit an LOS pattern by transmitting an
All Ones pattern. The user can accomplish this by executing the following steps.
STEP 1 - Set Bit 4 (TxLOS Pattern) within the Transmit DS3 Pattern Register, to "1", as illustrated
below.
Transmit DS3 Pattern Register (Address = 0x114C)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxAIS -
Unframed
All Ones
DS3 AIS
Non-Stuck
Stuff
Unused
TxLOS
Pattern
Transmit_Idle_Pattern[3:0]
R/W
R/O
R/W
0
1
0
Transmit DS3 Configuration Register (Address = 0x1130)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Tx Yellow
Alarm
Tx X-Bits
TxIdle
TxAIS
TxLOS
TxFERF
upon LOS
TxFERF
upon OOF
TxFERF
upon AIS
R/W
0
1
Transmit DS3 Pattern Register (Address = 0x114C)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TxAIS -
Unframed All
Ones
DS3 AIS
Non-Stuck
Stuff
Unused
TxLOS
Pattern
Transmit_Idle_Pattern[3:0]
R/W
R/O
R/W
0
1
0