XRT83VSH28IB datasheet(10/74 Pages) EXAR

10 / 74 page

XRT83VSH28

PRELIMINARY

8-CHANNEL E1 SHORT-HAUL LINE INTERFACE UNIT

REV. P1.0.0

RXRES1

RXRES0

R10

V10

Receive External Resistor Control Pins

Hardware mode Only

These pins are used in the Receive Internal Impedance mode for unique applica-

tions where an accurate resistor can be used to achieve optimal return loss. When

RxRES[1:0] are used, the LIU automatically sets the internal impedance to match

the line build out. For example: if 240

Ω is selected, the LIU chooses an internal

impedance such that the parallel combination equals the impedance chosen by

TERSEL[1:0].

"00" = No External Fixed Resistor

"01" = 240

Ω

"10" = 210

Ω

"11" = 150

Ω

NOTE: These pins are internally pulled “Low” with a 50k

Ω resistor. This feature is

available in Host mode by programming the appropriate channel register.

RCLKE/

µPTS1

J16

Receive Clock Edge

Hardware Mode

This pin is used to select which edge of the recovered clock is used to update data to

the receiver on the RPOS/RNEG outputs. By default, data is updated on the risinge

edge. To udpdate data on the falling edge, this pin must be pulled "High".

Host Mode

µPTS[2:1] pins are used to select the type of microprocessor to be used for Host

communication.

"00" = 8051 Intel Asynchronous

"01" = 68K Motorola Asynchronous

"11" = MPC8xx Power PC Synchronous

NOTE: This pin is internally pulled “Low” with a 50k

Ω resistor.

SIGNAL NAME

BGA

LEAD #

TYPE

DESCRIPTION

XRT83VSH28IB Datasheet(PDF) 10 Page - Exar Corporation

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