XRT83SH38 データシートの表示（PDF） - Exar Corporation

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XRT83SH38

14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

Exar Corporation 

XRT83SH38

8-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT

REV. 1.0.7

SIGNAL NAME

RXRES1

RXRES0

RCLKE/

µPTS1

BGA

LEAD #

R10

V10

J16

TYPE

DESCRIPTION

I 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 240Ω 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" = 240Ω

"10" = 210Ω

"11" = 150Ω

NOTE: These pins are internally pulled “Low” with a 50kΩ resistor. This feature is

available in Host mode by programming the appropriate channel register.

I 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

"10" = x86 Intel Synchronous

"11" = 860 Motorola Synchronous

NOTE: This pin is internally pulled “Low” with a 50kΩ resistor.

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