XRT83VSH28IB datasheet(61/74 Pages) EXAR

61 / 74 page

PRELIMINARY

XRT83VSH28

REV. P1.0.0

8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

NOTE: Any change in status will generate an interrupt (if enabled in channel register 0x04h and GIE is set to "1" in the

global register 0x80h). The status registers are reset upon read (RUR).

RLOSIS

Receiver Loss of Signal Status

0 = No change

1 = Change in status occurred

RUR

QRPDIS

Quasi Random Pattern Detection Status

0 = No change

1 = Change in status occurred

RUR

TABLE 26: MICROPROCESSOR REGISTER 0X08H BIT DESCRIPTION

CHANNEL 0-7 (0X08H-0X78H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

Reserved

This Register Bit is Not Used

1SEG6

1SEG5

1SEG4

1SEG3

1SEG2

1SEG1

1SEG0

Arbitrary Pulse Generation

The transmit output pulse is divided into 8 individual segments.

This register is used to program the first segment which corre-

sponds to the overshoot of the pulse amplitude. There are four

segments for the top portion of the pulse and four segments for the

bottom portion of the pulse. Segment number 5 corresponds to

the undershoot of the pulse. The MSB of each segment is the sign

bit.

Bit 6 = 0 = Negative Direction

Bit 6 = 1 = Positive Direction

R/W

TABLE 27: MICROPROCESSOR REGISTER 0X09H BIT DESCRIPTION

CHANNEL 0-7 (0X09H-0X79H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

Reserved

This Register Bit is Not Used

D[6:0]

2SEG[6:0]

Segment Number Two, Same Description as Register 0x08h

R/W

TABLE 25: MICROPROCESSOR REGISTER 0X06H BIT DESCRIPTION

CHANNEL 0-7 (0X06H-0X76H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

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