XRT83SL28IV datasheet(39/47 Pages) EXAR

39 / 47 page

XRT83SL28

REV. 1.0.0

8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

ARAOS_n Automatic Receive All Ones

If ARAOS_n is selected, an all ones pattern will be sent to the

RPOS/RNEG outputs if the channel experiences an RLOS condi-

tion. If RLOS does not occur, ARAOS_n will remain inactive.

"0" = Disabled

"1" = Enabled

R/W

ATAOS_n

Automatic Transmit All Ones

If ATAOS_n is selected, an all ones pattern will be transmitted from

TTIP/TRING if the channel experiences an RLOS condition. If

RLOS does not occur, ATAOS_n will remain inactive.

"0" = Disabled

"1" = Enabled

R/W

TAOS_n

Transmit All Ones

If TAOS_n is selected, an all ones pattern will be transmitted from

TTIP/TRING if the transmitter is turned on. Remote Loop Back

has priority over TAOS.

"0" = Disabled

"1" = Enabled

R/W

TXOE_n

Transmit Output Enable

Upon power up, the tranmitters are tri-stated. This bit is used to

enable the transmitter for this channel if the TxOE pin is pulled

"High". If the TxOE pin is pulled "Low", all 8 transmitters are tri-

stated.

"0" = Transmitter is disabled

"1" = Transmitter is enabled if TxOE pin is pulled "High"

R/W

TERSEL1

TERSEL0

Receive Line Impedance Select

TERSEL[1:0] are used to select the internal line impedance.

"00" = 75

Ω for Tx and "High-Z" for Rx

"01" = 120

Ω for Tx and "High-Z" for Rx

"10" = 75

Ω for Tx and Rx

"11" = 120

Ω for Tx and Rx

R/W

TABLE 10: MICROPROCESSOR REGISTER BIT DESCRIPTION

CHANNEL CONTROL REGISTER (0X04H, 0X08H, 0X0CH, 0X10H, 0X14H, 0X18H, 0X1CH, 0X20H)

BIT

NAME

FUNCTION

Type

Default

Value

(HW reset)

XRT83SL28IV Datasheet(PDF) 39 Page - Exar Corporation

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