XRT72L13 datasheet(110/370 Pages) EXAR

110 / 370 page

XRT72L13

MULTIPLEXER/FRAMER IC

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PRELIMINARY

REV. 1.0.6

received and the PMDL message has been extracted

and written into the "Receive LAPD Message" buffer.

Writing a "0" to this bit-field disables this interrupt (the

default condition). Writing a "1" to this bit-field en-

ables this interrupt.

Bit 0 RxLAPD (Message Reception Complete) In-

terrupt Status

This "Read-Only" bit field indicates whether or not the

"LAPD Message Reception Complete" interrupt has

occurred since the last read of this register. The

"LAPD Message Reception Complete" interrupt will

occur once the LAPD Receiver has received the last

bit of a complete LAPD Message frame, extracted the

PMDL message from this LAPD Message frame and

has written this (PMDL) message frame into the "Re-

ceive LAPD Message" buffer. The purpose of this in-

terrupt is to notify the local µP that the "Receive

LAPD Message" buffer contains a new PMDL mes-

sage, that needs to be read and/or processed.

A "0" in this bit-field indicates that the "LAPD Mes-

sage Reception Complete" interrupt has NOT oc-

curred since the last read of this register. A "1" in this

bit-field indicates that the "LAPD Message Reception

Complete" interrupt has occurred since the last read

of this register.

NOTE: For more information on the LAPD Receiver, please

see Section _.

2.3.2.23 RxDS3 LAPD Status Register

Bit 6 - RxAbort (Receive Abort Sequence)

This "Read-Only" bit-field indicates whether or not the

LAPD Receiver has detected the occurrence of an

"Abort Sequence" (e.g., a string of seven or more

consecutive "1s") from the "far-end" LAPD Transmit-

ter. A "0" in this bit-field indicates that no "Abort-Se-

quence" has been detected. A "1" in this bit-field indi-

cates that the "Abort-Sequence" has been detected.

NOTE: For more information on the LAPD Receiver, please

see Section _.

Bits, 5 and 4 - RxLAPDType[1, 0]

These two "Read Only" bit-fields combine to indicate

the "type" of LAPD Message frame that has been re-

ceived by the LAPD Receiver. The relationship be-

tween these two bit-fields and the LAPD Message

Type follows:

Bit 3 - RxCR (Command/Response) Type

This "Read Only" bit field indicates the value of the C/

R (Command/Response) bit-field of the latest re-

ceived LAPD Message.

Bit 2 - Rx FCS (Frame Check Sequence) Error

This "Read-Only" bit-field indicates whether or not the

LAPD Receiver has detected a "Frame Check Se-

quence" (FCS) error in the newly received LAPD

Message Frame. A "0" in this bit-field indicates that

the FCS for the latest received LAPD Message Frame

is correct. A "1" in this bit-field indicates that the FCS

for the latest received LAPD Message Frame is incor-

rect.

NOTE: For more information on the LAPD Receiver, please

see Section _.

Bit 1 - End Of Message

This "Read-Only" bit-field indicates whether or not the

LAPD Receiver has completed its reception of the lat-

est incoming LAPD Message frame. The local µP

can poll the progress of the LAPD Receiver by peri-

odically reading this bit-field.

A "0" in this bit-field indicates that the LAPD Receiver

is still receiving the latest message from the "far end"

LAPD Transmitter. A "1" in this bit-field indicates that

the LAPD Receiver has finished receiving the com-

plete LAPD Message Frame.

RXDS3 LAPD STATUS REGISTER (ADDRESS = 0X19)

BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0

Not Used

RxAbort

RxLAPDType[1:0}

RxCR Type

RxFCS Error

End of

Message

Flag Present

000

BIT 5BIT 4MESSAGE TYPE

MESSAGE LENGTH

Test Signal Identification

76 Bytes

Idle Signal Identification

76 Bytes

CL Path Identification

76 Bytes

ITU-T Path Identification

82 Bytes

XRT72L13 Datasheet(PDF) 110 Page - Exar Corporation

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