XRT79L71IB datasheet(45/109 Pages) EXAR

45 / 109 page

XRT79L71

REV. 1.0.0

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

RxPFrame/

RxOHInd

Receive PLCP Frame Indicator/Receive Overhead Indicator Output:

The function of this output pin depends upon whether the XRT79L71 has been

configured to operate in the ATM/PLCP, the Clear-Channel Framer/Serial or the

Clear-Channel Framer/Nibble-Parallel Modes.

ATM/PLCP Mode - RxPFrame - Receive PLCP Frame Indicator Output:

This output pin pulses "High" when the Receive PLCP Processor is receiving

the last bit of a PLCP frame.

NOTE: This output pin is inactive if the XRT79L71 is configured to operate in the

Direct-Mapped ATM Mode.

Clear-Channel Framer/Serial Mode - RxOHInd RxOHInd - Receive Over-

head Indicator Output:

This output pin pulses "High" for one bit-period whenever an overhead bit is

being output via the RxSer output pin, by the Receive Payload Data Output

Interface block.

NOTE: If the user configures the Receive Payload Data Output Interface block

to operate in the Gapped-Clock Mode, then this output pin will provide a

demand clock to the System-Side terminal equipment In the Gapped-

Clock Mode, this output pin will only provide a clock pulse, whenever a

payload bit is being output via the RxSer output pin. This output pin will

NOT generate a clock pulse, whenever an overhead is being output via

the RxSer output pin.

Clear-Channel Framer/Nibble-Parallel - RxOHInd RxOHInd - Receive Over-

head Indicator Output:

This output pin pulse "High" for one nibble-period whenever an overhead nibble

is being output via the RxNib[3:0] output pins by the Receive Payload Data Out-

put Interface block.

NOTES:

1.If the XRT79L71 has been configured to operate in both the DS3 and

the Nibble-Parallel Modes, then the RxOHInd output pin will be in-

active and will pulled "Low" at all times.

If the XRT79L71 has been configured to operate in both the E3 and

the Nibble-Parallel Mode, then the RxOHInd output pin will be active

and will pulse "High" to denote overhead nibbles.

The purpose of this output pin is to alert the System-Side terminal

equipment that an overhead bit (or nibble) is being output via the

RxSer or RxNib[3:0] output pins and that this data should be ignored.

PIN #NAME

TYPE

DESCRIPTION

XRT79L71IB Datasheet(PDF) 45 Page - Exar Corporation

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