XRT86VL32IB datasheet(38/65 Pages) EXAR

38 / 65 page

XRT86VL32

DUAL T1/E1/J1 FRAMER/LIU COMBO - HARDWARE DESCRIPTION

REV. V1.2.0

ADDR0

ADDR1

ADDR2

ADDR3

ADDR4

ADDR5

ADDR6

ADDR7

ADDR8

ADDR9

ADDR10

ADDR11

ADDR12

ADDR13

R10

V11

Microprocessor Interface Address Bus Input

These pins permit the Microprocessor to identify on-chip regis-

ters and Buffer/Memory locations within the XRT86VL32

device whenever it performs READ and WRITE operations with

the XRT86VL32 device.

NOTE:

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

resistor, except ADDR [8:13].

DBEN

Data Bus Enable Input pin.

This active-low 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 pin “high” tri-states the Bi-directional Data

Bus.

ALE

Address Latch Enable Input Address Strobe

The exact behavior of this pin depends upon the type of Micro-

processor/Microcontroller the XRT86VL32 has been configured

to operate in, as defined by the PTYPE[2:0] pins.

Intel-Asynchronous Mode - ALE

This active-high input pin is used to latch the address (present

at the Microprocessor Interface Address Bus pins (A[14:0]) into

the XRT86VL32 Microprocessor Interface block and to indicate

the start of a READ or WRITE cycle.

Pulling this input pin “high” enables the input bus drivers for the

Address Bus input pins (A[14:0]). The contents of the Address

Bus will be latched into the XRT86VL32 Microprocessor Inter-

face circuitry, upon the falling edge of this input signal.

Motorola-Asynchronous (68K) Mode - AS*

This active-low input pin is used to latch the data residing on

the Address Bus, A[14:0] into the Microprocessor Interface cir-

cuitry of the XRT86VL32 device.

Pulling this input pin “low” enables the input bus drivers for the

Address Bus input pins. The contents of the Address Bus will

be latched into the Microprocessor Interface circuitry, upon the

rising edge of this signal.

Power PC 403 Mode - No Function -Tie to GND:

This input pin has no role nor function and should be tied to

GND.

MICROPROCESSOR INTERFACE

SIGNAL NAME

BALL #TYPE

OUTPUT

DRIVE (MA)

DESCRIPTION

XRT86VL32IB Datasheet(PDF) 38 Page - Exar Corporation

XRT86VL32IB Datasheet(HTML) 38 Page - Exar Corporation

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