XRT79L71_1 Datasheet, PDF (227/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

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XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
BIT
NUMBER
4
RLB
NAME
TYPE
R/W
DEFAULT
VALUE
0
DESCRIPTION
Loop-Back Select - RLB Bit:
This READ/WRITE bit-field along with the corresponding
LLB bit-field permits the user to configure the XRT79L71
into any of the following loop-back modes.
• Normal (No-Loop-back) Mode·
• LIU Remote Loop-back Mode
• LIU Analog Local Loop-back Mode·
• LIU Digital Local Loop-back Mode
The relationship between the settings for this input pin, the
corresponding LLB bit-field and the resulting Loop-back
Mode is presented below.
LLB RLB
Loop-back Mode
0
0
Normal (No Loop-back) Mode
0
1
LIU Remote Loop-back Mode
1
0 LIU Analog Local Loop-back Mode
1
1 LIU Digital Local Loop-back Mode
3
LLB
2 - 0 Unused
R/W
0
Loop-Back Select - LLB Bit-field:
Please see the description (above) for RLB.
R/O
0
Jitter Attenuator Control Register (Address = 0x1307)
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
Unused
DFL
Jitter
Attenuator
FIFO
Pointer
RESET
R/O
R/O
R/O
R/W
R/W
0
0
0
0
0
BIT 2
Jitter
Attenuator
PLL/FIFO
Operating
Mode - Bit 1
R/W
0
BIT 1
Jitter
Attenuator
in Transmit
Path
BIT 0
Jitter
Attenuator
PLL/FIFO
Operating
Mode - Bit 0
R/W
R/W
0
0
BIT
NUMBER
NAME
7 - 5 Unused
TYPE
R/O
DEFAULT
VALUE
0
DESCRIPTION
218