XRT83VSH28IB datasheet(56/74 Pages) EXAR

56 / 74 page

XRT83VSH28

PRELIMINARY

8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

REV. P1.0.0

JABW

Jitter Bandwidth

The jitter bandwidth is a global setting that is applied to both the

receiver and transmitter jitter attenuator.

0 = 10Hz

1 = 1.5Hz

R/W

FIFOS

FIFO Depth Select

The FIFO depth select is used to configure the part for a 32-bit or

64-bit FIFO (within the jitter attenuator blocks). The delay of the

FIFO is equal to ½ the FIFO depth. This is a global setting that is

applied to both the receiver and transmitter FIFO.

0 = 32-Bit

1 = 64-Bit

R/W

TABLE 21: MICROPROCESSOR REGISTER 0X02H BIT DESCRIPTION

CHANNEL 0-7 (0X02H-0X72H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

INVQRSS

QRSS inversion

INVQRSS is used to invert the transmit QRSS pattern set by the

TxTEST[2:0] bits. By default, INVQRSS is disabled and the QRSS

will be transmitted with normal polarity.

0 = Disabled

1 = Enabled

R/W

TxTEST2

TxTEST1

TxTEST0

Test Code Pattern

TxTEST[2:0] are used to select a diagnostic test pattern to the line

(transmit outputs).

0XX = No Pattern

100 = Tx QRSS

101 = Tx TAOS

110 = Reserved

111 = Reserved

R/W

TABLE 20: MICROPROCESSOR REGISTER 0X01H BIT DESCRIPTION

CHANNEL 0-7 (0X01H-0X71H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

XRT83VSH28IB Datasheet(PDF) 56 Page - Exar Corporation

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