XRT83VSH38 データシートの表示（PDF） - Exar Corporation

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XRT83VSH38

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

Exar Corporation 

XRT83VSH38

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

TRANSMIT SECTION

REV. 1.0.7

SIGNAL NAME

BGA

LEAD #

TCLKE/µPTS2 L15

TTIP0

E3

TTIP1

G4

TTIP2

F17

TTIP3

C16

TTIP4

R2

TTIP5

N2

TTIP6

N16

TTIP7

P16

TRING0

E2

TRING1

F3

TRING2

F15

TRING3

E16

TRING4

P2

TRING5

N4

TRING6

R15

TRING7

P17

TPOS0

C5

TPOS1

A4

TPOS2

B14

TPOS3

D14

TPOS4

V4

TPOS5

U5

TPOS6

V15

TPOS7

T14

TNEG0

C4

TNEG1

B5

TNEG2

D13

TNEG3

B15

TNEG4

U4

TNEG5

V5

TNEG6

U14

TNEG7

R14

TYPE

DESCRIPTION

I Transmit Clock Edge

Hardware Mode

This pin is used to select which edge of the transmit clock is used to sample data

on the transmitter on the TPOS/TNEG inputs. By default, data is sampled on the

falling edge. To sample data on the rising 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

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

O Transmit Differential Tip Output

TTIP is the positive differential output to the line interface. Along with the TRING

signal, these pins should be coupled to a 1:2 step up transformer for proper opera-

tion.

O Transmit Differential Ring Output

TRING is the negative differential output to the line interface. Along with the TTIP

signal, these pins should be coupled to a 1:2 step up transformer for proper opera-

tion.

I TPOS/TDATA Input

Transmit digital input pin. In dual rail mode, this pin is the transmit positive data

input. In single rail mode, this pin is the transmit non-return to zero (NRZ) data

input.

NOTE: Internally pulled "Low" with a 50KΩ resistor.

I Transmitter Negative NRZ Data Input

In dual rail mode, this signal is the negative-rail input data for the transmitter. In

single rail mode, this pin can be left unconnected while in Host mode. However, in

Hardware mode, this pin is used to select the type of encoding/decoding for the E1/

T1 data format. Connecting this pin “Low” enables HDB3 in E1 or B8ZS in T1.

Connecting this pin “High” selects AMI data format.

NOTE: Internally pulled “Low” with a 50kΩ resistor.

7

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