XRT86VL32IB datasheet(46/154 Pages) EXAR

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XRT86VL3X

T1/E1/J1 FRAMER/LIU COMBO - ARCHITECTURE DESCRIPTION

REV. 1.2.3

4.2.3

Configure the DS1 Receive Overhead Output Interface module as destination of the

Signaling Framing (Fs) bits in N or SLC®96 framing format mode

The Fs bits in SLC®96 and N framing format mode can be extracted to:

• DS1 Receive Overhead Output Interface Block

• DS1 Receive HDLC Controller

• DS1 Receive Serial Output Interface.

The Receive Data Link Source Select bits of the Receive Data Link Select Register (RDLSR) controls the

destination of Fs bits in N or SLC®96 framing format mode. The table below shows configuration of the

Receive Data Link Source Select bits of the Receive Data Link Select Register (RDLSR).

If the Receive Data Link Source Select bits of the Receive Data Link Select Register are set to 10, the Receive

Overhead Output Interface Block outputs Fs bits extracted from the incoming T1 data stream.

FIGURE 39. DS1 RECEIVE OVERHEAD OUTPUT INTERFACE MODULE IN ESF FRAMING FORMAT MODE

RECEIVE DATA LINK SELECT REGISTER (TDLSR) (ADDRESS = 0XN10AH)

BIT

NUMBER

BIT NAME

BIT TYPE

BIT DESCRIPTION

1-0

Receive Data Link

Source Select

R/W

00 - The extracted Facility Data Link bits are stored in either the LAPD con-

troller or the SLC®96 buffer. At the same time, the extracted Facility Data

Link bits are outputted from the framer through the Receive Serial Data

Output Interface via the RxSer_n pins.

01 - The extracted Facility Data Link bits are outputted from the framer

through the Receive Serial Data Output Interface via the RxSer_n pins.

10 - The extracted Facility Data Link bits are outputted from the framer

through the Receive Overhead Output Interface via the RxOH_n pins. At

the same time, the extracted Facility Data Link bits are outputted from the

framer through the Receive Serial Data Output Interface via the RxSer_n

pins.

11 - The Facility Data Link bits are forced to one by the framer.

RxOhClk

(2KHz,even)

RxOh

(2KHz,even)

RxOh

(4KHz)

RxOhClk

(2KHz,odd)

RxOh

(2KHz,odd)

Frame#

RxSync

RxOhClk

(4KHz)

XRT86VL32IB Datasheet(PDF) 46 Page - Exar Corporation

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