XRT79L71_1 Datasheet, PDF (76/434 Pages) Exar Corporation – 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC -

XRT79L71
1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION
REV. 1.0.0
I/O Control Register (Address = 0x1101)
BIT 7
BIT 6
BIT 5
BIT 4
Disable
TxLOC
LOC
Disable
RxLOC
R/W
R/O
R/W
R/O
1
0
1
0
BIT 3
BIT 2
Reserved
R/O
R/O
0
1
BIT 1
R/O
0
BIT 0
Reframe
R/W
0
BIT NUMBER
NAME
7
Disable TxLOC
6
LOC
5
Disable RxLOC
4-1
0
Reserved
Reframe
TYPE
R/W
R/O
R/W
R/W
DESCRIPTION
Disable Transmit Loss of Clock Feature:
This READ/WRITE bit-field permits the user to either enable or
disable the Transmit Loss of Clock feature.
If this feature is enabled, then the DS3/E3 Framer block will
enable some circuitry that will terminate the current READ or
WRITE access (to the Microprocessor Interface), if a Loss of
Transmit (or Frame Generator) Clock Event were to occur.
The intent behind this feature is to prevent any READ/WRITE
accesses (to the DS3/E3 Framer block) from hanging in the
event of a Loss of Clock event.
0 - Enables the Transmit Loss of Clock feature.
1 - Disables the Transmit Loss of Clock feature.
Loss of Clock Indicator:
This READ-ONLY bit-field indicates that the Channel has experi-
ences a Loss of Clock event.
Disable Receive Loss of Clock Feature:
This READ/WRITE bit-field permits the user to either enable or
disable the Receive Loss of Clock feature.
If this feature is enabled, then the DS3/E3 Framer block will
enable some circuitry that will terminate the current READ or
WRITE access (to the Microprocessor Interface), if a Loss of
Receiver Clock Event were to occur.
The intent behind this feature is to prevent any READ/WRITE
accesses (to the DS3/E3 Framer block) from hanging in the
event of a Loss of Clock event.
0 - Enables the Receive Loss of Clock feature.
1 - Disables the Receive Loss of Clock feature.
the User must make sure that each of these bits are set to "0" in
order to ensure proper operation.
Receive DS3/E3 Framer Block - Reframe Command:
A "0" to "1" transition, within this bit-field commands the Receive
DS3/E3 Framer block to exit the Frame Maintenance Mode, and
go back and enter the Frame Acquisition Mode
NOTE: The user should go back and set this bit-field to "0"
following execution of the Reframe Command.
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