XRT86VL32IB datasheet(47/154 Pages) EXAR

47 / 154 page

XRT86VL3X

REV. 1.2.3

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

Figure 40 below shows the timing diagram of the output signals associated with the DS1 Receive Overhead

Output Interface module in N or SLC®96 framing format mode.

4.2.4

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

Signaling (R) bits in T1DM framing format mode

The R bits in T1DM 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 R bits in T1DM 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 the R bits extracted from the incoming T1 data stream. Since R bit

presents in Timeslot 24 of every T1DM frame, therefore, bandwidth of T1DM data link channel is 8KHz.

FIGURE 40. DS1 RECEIVE OVERHEAD OUTPUT INTERFACE TIMING IN N OR SLC®96 FRAMING FORMAT MODE

RECEIVE DATA LINK SELECT REGISTER (RDLSR) (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.

XRT86VL32IB Datasheet(PDF) 47 Page - Exar Corporation

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