XRT79L71IB datasheet(76/434 Pages) EXAR

76 / 434 page

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

BIT 3

BIT 2

BIT 1

BIT 0

Disable

TxLOC

LOC

Disable

RxLOC

Reserved

Reframe

R/W

R/O

R/W

R/O

R/W

BIT NUMBER

NAME

TYPE

DESCRIPTION

Disable TxLOC

R/W

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.

LOC

R/O

Loss of Clock Indicator:

This READ-ONLY bit-field indicates that the Channel has experi-

ences a Loss of Clock event.

Disable RxLOC

R/W

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.

4 - 1

Reserved

the User must make sure that each of these bits are set to "0" in

order to ensure proper operation.

Reframe

R/W

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.

XRT79L71IB Datasheet(PDF) 76 Page - Exar Corporation

XRT79L71IB Datasheet(HTML) 76 Page - Exar Corporation

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