XRT86VL34 datasheet(72/156 Pages) EXAR

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XRT86VL34

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

REV. V1.2.0

TABLE 50: TRANSMIT CHANNEL CONTROL REGISTER 0-23 (TCCR 0-23)

HEX ADDRESS: 0Xn300 TO 0Xn317

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

LAPDcntl[1]

R/W

Transmit LAPD Control

These bits select which one of the three Transmit LAPD controller is config-

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

The following table presents the different settings of these two bits.

NOTE:

All three Transmit LAPD Controllers can use D/E timeslots for

transmission. However, only Transmit LAPD Controller 1 can use

datalink for transmission. Register 0xn300 represents D/E time slot

0, and 0xn317 represents D/E time slot 23.

LAPDcntl[0]

R/W

5 - 4 TxZERO[1:0]

R/W

Selects Type of Zero Suppression

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

XRT86VL34 device

LAPDCNTL[1:0]

LAPD CONTROLLER SELECTED

Transmit LAPD Controller 1

Transmit LAPD Controller 2

The TxDE[1:0] bits in the Transmit Signaling and

Data Link Select Register (TSDLSR - Register

Address - 0xn10A, bit 3-2) determine the data

source for D/E time slots.

Transmit LAPD Controller 3

TXZERO[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-sig-

naling 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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