XRT83VSH316 Просмотр технического описания (PDF) - Exar Corporation

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XRT83VSH316

IC LIU SH T1/E1/J1 16CH 316STBGA

Exar Corporation 

XRT83VSH316

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

REV. 1.0.2

RECEIVER SECTION

NAME

PIN

RxON

Y16

RxTSEL

A16

RLOS

T4

SRLOS

T5

TYPE

I

I

DESCRIPTION

Receive On/Off Input

Upon power up, the receivers are powered off. Turning the receivers On or Off

can be selected through the microprocessor interface by programming the

appropriate channel register if the hardware pin is pulled "High". If the hard-

ware pin is pulled "Low", all channels are automatically turned off.

NOTE: Internally pulled "Low" with a 50K resistor.

Receive Termination Control

Upon power up, the receivers are in "High" impedance. Switching to internal

termination can be selected through the microprocessor interface by program-

ming the appropriate channel register. However, to switch control to the hard-

ware pin, RxTCNTL must be programmed to "1" in the appropriate global

register. Once control has been granted to the hardware pin, it must be pulled

"High" to switch to internal termination.

NOTE: Internally pulled "Low" with a 50kresistor.

RxTSEL (pin)

Rx Termination

0

External

1

Internal

Note: RxTCNTL (bit) must be set to "1"

O

Receive Loss of Signal (Global Pin for All 16-Channels)

When a line side receive loss of signal occurs for any one of the 16-channels

according to ITU-T G.775, the RLOS pin will go "High" for a minimum of one

RCLK cycle. RLOS will remain "High" until the loss of signal condition clears.

See the Receive Loss of Signal section of this datasheet for more details.

NOTE: This pin is for redundancy applications to initiate an automatic switch to

the backup card. For individual channel RLOS, see the register map.

O

System Receive Loss of Signal (Global Pin for All 16-Channels)

When a system side receive loss of signal occurs for any one of the 16-chan-

nels according to ITU-T G.775, the SRLOS pin will go "High" for a minimum of

one TCLK cycle. SRLOS will remain "High" until the loss of signal condition

clears. See the Receive Loss of Signal section of this datasheet for more

details.

5

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