XRT79L71 datasheet(52/109 Pages) EXAR

52 / 109 page

XRT79L71

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

REV. 1.0.0

RxUData_0/

RxPData_0

RxUData_1/

RxPData_1

RxUData_2/

RxPData_2

RxUData_3/

RxPData_3

RxUData_4/

RxPData_4

RxUData_5/

RxPData_5

RxUData_6/

RxPData_6

RxUData_7/

RxPData_7

RxUData_8/

RxPData_8

RxUData_9/

RxPData_9

RxUData_10/

RxPData_10

RxUData_11/

RxPData_11

RxUData_12/

RxPData_12

RxUData_13/

RxPData_13

RxUData_14/

RxPData_14

RxUData_15/

RxPData_15

Receive UTOPIA Data Bus Input/Receive POS:

The function of these output pins depends upon whether the XRT79L71 has

been configured to operate in the ATM UNI or in the PPP Mode.

ATM UNI Mode - RxUData[15:0]-PHY Data Bus Output pins - Receive UTO-

PIA Interface Data Bus Output pins:

These output pins function as the Receive UTOPIA Data Bus output pins.

Whenever the ATM Layer Processor wishes to read out ATM cell data that has

been received from the Remote Terminal Equipment, the Receive UTOPIA

Interface block will output this data via the Receive UTOPIA Data Bus, where it

can be read and processed by the ATM Layer Processor.

PPP Mode - RxPData[15:0]:

These output pins function as the Receive POS-PHY Data Bus output pins.

PPP Packet data that has been received from the Remote Terminal Equipment

is output on the Receive POS-PHY Data Bus, where it can be reads and pro-

cessed by the Link Layer Processor.

RxMod

Receive PPP Data Bus - Modulus Indicator:

The XRT79L71 will indicate the number of valid packet octets that are being

read out of the RxPData[15:0] output pins.

The XRT79L71 will drive this output pin "Low" when both bytes of the RxP-

Data[15:0] data bus consists of valid packet data.

Conversely, the XRT79L71 will drive this output pin "High" when only the upper

byte of the RxPData[15:0] data bus consists of valid packet data.

The Link Layer Processor is expected to validate all packet data that it reads out

of the RxPData[15:0] output pins by also reading the state of this output pin.

NOTE: This output pin is only active if the XRT79L71 has been configured to

operate in the PPP Mode.

PIN #NAME

TYPE

DESCRIPTION

XRT79L71 Datasheet(PDF) 52 Page - Exar Corporation

XRT79L71 Datasheet(HTML) 52 Page - Exar Corporation

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