XRT79L71IB datasheet(13/109 Pages) EXAR

13 / 109 page

XRT79L71

REV. 1.0.0

1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE

J16

J15

J14

PTYPE_0

PTYPE_1

PTYPE_2

Microprocessor Type Select input:

These three input pins are used to configure the Microprocessor Interface block to

readily support a wide variety of Microprocessor Interfaces. The relationship

between the settings of these input pins and the corresponding Microprocessor Inter-

face configuration is presented below.

J13

DBEN

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]).

Setting this input pin "Low" enables the Bi-directional Data bus. Setting this input

"High" tri-states the Bi-directional Data Bus.

B15

BLAST

Last Burst Transfer Indicator input pin:

If the Microprocessor Interface is operating in the Intel-I960 Mode, then this input pin

is 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:

If the user has configured the Microprocessor Interface to operate in the Intel

Asynchronous, the Motorola-Asynchronous or the Power PC 403 Mode,

then tie this input pin to GND.

H13

Direct_Ad

Direct Address Select pin:

The user should pull this input pin to the logic "High" level for normal operation.

PIN #

NAME

TYPE

DESCRIPTION

TEST AND DIAGNOSTIC

TCK

Test Clock input, Boundary Scan Clock input:

NOTE: This input pin should be pulled "Low" for normal operation.

TDI

Test Data input, Boundary Scan Test Data Input:

NOTE: This input pin should be pulled "Low" for normal operation.

PIN DESCRIPTIONS

PIN #NAME

TYPE

DESCRIPTION

PTYPE[2:0]

010

001

Intel-Asynchronous Mode

Intel i960

011

Intel X86

100

Power PC 403 Mode

IDT3051/52 (MIPS)

101

Motorola-Asynchronous Mode

(Motorola 68K)

000

Microprocessor Interface Mode

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