XRT86VL34 datasheet(77/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

TABLE 53: RECEIVE CHANNEL CONTROL REGISTER 0-23 (RCCR 0-23)

HEX ADDRESS: 0Xn360 TO 0XN377

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

LAPDcntl[1]

R/W

Receive LAPD Control

These bits select which one of the three Receive LAPD controller will be

configured to use D/E time slot (Octets 0-23) for receiving LAPD messages.

NOTE: All three LAPD Controller can use D/E timeslots for receiving LAPD

messages. However, only LAPD Controller 1 can use datalink for

reception.

NOTE: Register 0xn360 represents D/E time slot 0, and 0xn377 represents

D/E time slot 23.

LAPDcntl[0]

R/W

5-4

RxZERO[1:0]

R/W

Type of Zero Suppression

These bits select the type of zero code suppression used by the

XRT86VL34 device.

LAPDCNTL[1:0]

RECEIVE LAPD CONTROLLER SELECTED

Receive LAPD Controller 1

Receive LAPD Controller 2

The RxDE[1:0] bits in the Receive Signaling

and Data Link Select Register (RSDLSR -

Address - 0xn10C) determine the data

source for Receive D/E time slots.

Receive LAPD Controller 3

RXZERO[1:0]

TYPE OF ZERO CODE SUPPRESSION

SELECTED

No zero code suppression is used

AT&T bit 7 stuffing is used

GTE zero code suppression is used. If GTE

zero code suppression is used, bit 8 is

stuffed in non-signaling frame. Otherwise,

bit 7 is stuffed in signaling frame if signaling

bit is zero.

DDS zero code suppression is used. The

value 0x98 replaces the input data

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