![](http://datasheet.mmic.net.cn/Exar-Corporation/XRT79L71IB-F_datasheet_100145/XRT79L71IB-F_112.png)
XRT79L71
PRELIMINARY
97
1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMERLIU COMBO - CC/HDLC ARCHITECTURE
REV. P2.0.0
via the up-stream path from the Transmit Payload Data Input Interface block, and to insert these same C bits
values into its outbound DS3 data-stream. This can be accomplished by executing the following steps.
STEP 1 - Write the value "1" into Bit 7 (TxOHSrc), within the Test Register at depicted below.
STEP 2 - Write the value [0, 0, 0] into Bits 1 through 3 (C71 through C73) within the Transmit DS3 F-Bit
Mask # 1 Register, as depicted below.
STEP 3 - Write the value [0, 0, 0] into Bits 1 through 3 (C51 through C53) and the value [0, 0, 0] into Bits
5 through 7 (C61 through C63) within the Transmit DS3 F-Bit Mask # 2 Register, as depicted below.
STEP 4 - Write the value [0, 0, 0] into Bits 1 through 3 (C31 through C33), and the value [0, 0, 0] into Bits
5 through 7 (C41 through C43) within the Transmit DS3 F-Bit Mask # 3 Register, as depicted below.
STEP 5 - Write the value [0, 0, 0] into Bits 1 through 3 (C11 through C13) and the value [0, 0, 0] into Bits
5 through 7 (C21 through C23) within the Transmit DS3 F-Bit Mask # 4 Register, as depicted below.
Test Register (Address = 0x110C)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
TXOH
SOURCE
RECEIVE
GAPPED
CLOCK MODE
ENABLE
TRANSMIT
GAPPED
CLOCK MODE
ENABLE
RECEIVE
PRBS LOCK
RECEIVE
PRBS
DETECTOR
ENABLE
TRANSMIT
PRBS
GENERATOR
ENABLE
UNUSED
R/W
R/O
R/W
R/O
1
0
Transmit DS3 F-Bit Mask # 1 Register (Address = 0x1136)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
Unused
UDL Bit #
9(C73)
UDL Bit #
8(C72)
UDL Bit #
7(C71)
Unused
R/O
R/W
0
Transmit DS3 F-Bit Mask # 2 Register (Indirect Address = 0xnE, 0x37; Direct Address = 0x1137)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
UDL Bit # 6
(C63)
UDL Bit # 5
(C62)
UDL Bit # 4
(C61)
Unused
DL Bit # 3
(C53)
DL Bit # 2
(C52)
DL Bit # 1
(C51)
Unused
R/W
0
Transmit DS3 F-Bit Mask # 3 Register (Indirect Address = 0xnE, 0x37; Direct Address = 0x1138)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
FEBE Bit 3
(C43)
FEBE Bit 2
(C42)
FEBE Bit 1
(C41)
Unused
CP Bit # 3
(C33)
CP Bit # 2
(C32)
CP Bit # 1
(C31)
Unused
R/W
0
X
0
X