XRT94L33 datasheet(9/465 Pages) EXAR

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XRT94L33

3-CHANNEL DS3/E3/STS-1 TO STS-3/STM-1 MAPPER IC DATA SHEET

Rev.1.2.0.

PIN #

SIGNAL NAME

I/O

SIGNAL

TYPE

DESCRIPTION

AF21

PDBEN_L

TTL

Bi-directional Data Bus Enable Input pin:

This input pin permits the user to either enable or tri-state the Bi-

Directional Data Bus pins (D[7:0]), as described below.

Setting this input pin “low” enables the Bi-directional Data bus.

Setting this input “high” tri-states the Bi-directional Data Bus.

AF20

PBLAST_L

TTL

Last Burst Transfer Indicator input pin:

If the Microprocessor Interface is operating in the Intel-I960

Mode,

then

this

input

used to indicate

(to

the

Microprocessor Interface block) that the current data transfer is

the last data transfer within the current burst operation.

The Microprocessor should assert this input pin (by toggling it

“Low”) in order to denote that the current READ or WRITE

operation (within a BURST operation) is the last operation of this

BURST operation.

Note:

The user should connect this input pin to GND

whenever the Microprocessor Interface has been

configured to operate in the Intel-Async, Motorola 68K

and IBM PowerPC 403 modes.

AG22

PINT_L

CMOS

Interrupt Request Output:

This open-drain, active-low output signal will be asserted when

the Mapper/Framer device is requesting interrupt service from

the Microprocessor.

This output pin should typically be

connected to the “Interrupt Request” input of the Microprocessor.

AB24

RESET_L

TTL

Reset Input:

When this “active-low” signal is asserted, the XRT94L33 will be

asynchronously reset. When this occurs, all outputs will be “tri-

stated” and all on-chip registers will be reset to their “default”

values.

AE18

DIRECT_ADD_SEL

TTL

Address Location Select input pin:

This input pin must be pulled “HIGH” in order to permit normal

operation of the Microprocessor Interface.

SONET/SDH SERIAL LINE INTERFACE PINS

RXLDAT_P

LVPECL

Receive STS-3/STM-1 Data – Positive Polarity PECL Input:

This input pin, along with RXLDAT_N functions as the

Recovered Data Input, from the Optical Transceiver or as the

Receive Data Input from the system back-plane

Note:

For APS (Automatic Protection Switching) purposes,

this input pin, along with “RXLDAT_N” functions as the

“Primary” STS-3/STM-1 Receive Data Input Port.

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