XRT79L71IB datasheet(74/434 Pages) EXAR

74 / 434 page

XRT79L71

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - REGISTER/MAP DESCRIPTION

REV. 1.0.0

Internal LOS Enable

R/W

Internal LOS Enable:

This READ/WRITE bit-field permits the user to enable or disable

the Internal LOS Detector, within the Receive DS3/E3 Framer

block. If the user disables the Internal LOS Detector then the

Receive Section of the XRT79L71 will only declare the LOS

defect condition, whenever the Receive DS3/E3 LIU block

declares the LOS defect condition.

0 - Internal LOS Detector is disabled.

1 - Internal LOS Detector is enabled.

RESET

R/W

Software RESET Input:

A "0" to "1" transition in this bit-field commands a Software

RESET to the XRT79L71. Once the user executes a Software

reset to the frame, all of the internal state machines will be reset

and the Receive DS3/E3 Framer block will execute a Reframe

operation.

NOTE: For a Software Reset, the contents of the Command

Direct Map ATM

R/W

Direct Map ATM:

This READ/WRITE bit-field permits the user to configure the

XRT79L71 to operate in either the Direct Map ATM mode or in

the PLCP Mode. If the user configures the XRT79L71 to operate

in the Direct Map ATM Mode, then both the Transmit PLCP Pro-

cessor and the Receive PLCP Processor blocks will be

bypassed and will not process any ATM cell traffic. In this case,

ATM cells will be DIRECTlY mapped into the payload bits within

each outbound DS3 or E3 frame, without first being mapped into

PLCP frames.

If the user configures the XRT79L71 to operate in the Direct Map

ATM Mode, then both the Transmit PLCP Processor and

Receive PLCP Processor blocks will be enabled and will be pro-

cessing ATM cell traffic.

0 - Configures the XRT79L71 to operate in the PLCP Mode.

1 - Configures the XRT79L71 to operate in the Direct Map ATM

Mode.

NOTE: This bit-field is only active if the XRT79L71 has been

configured to operate in the ATM UNI Mode.

BIT NUMBER

NAME

TYPE

DESCRIPTION

XRT79L71IB Datasheet(PDF) 74 Page - Exar Corporation

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