PEF22504HT datasheet(39/255 Pages) INFINEON

39 / 255 page

Data Sheet

Rev. 1.3, 2006-01-25

QuadLIU

PEF 22504

Pin Descriptions

BHE

IPU

Bus High Enable

Intel bus mode.

If 16-bit bus interface mode is enabled, this signal indicates

a data transfer on the upper byte of the data bus D(15:8). In

8-bit bus interface mode this signal has no function and

should be tied to VDD or left open.

BLE

IPU

Bus Low Enable

Motorola bus mode.

If 16-bit bus interface mode is enabled, this signal indicates

a data transfer on the lower byte of the data bus D(7:0). In 8-

bit bus interface mode this signal has no function and should

be tied to VDD or left open.

IPU

Chip Select

Low active chip select.

INT

–

Interrupt Request

INT serves as general interrupt request for all interrupt

sources. These interrupt sources can be masked via

registers IMR(7:0). Interrupt status is reported via registers

GIS (Global Interrupt Status) and ISR(7:0).

Output characteristics (push-pull active low/high, open drain)

are determined by programming register IPC.

READY

OoD

(PU)

Data Ready

oD output only if activated by READY_EN = 1

B and if Intel

bus mode is selected. If not activated (READY_EN = 0

B) the

pull-up resistor is active.

Asynchronous handshake signal to indicate successful read

or write cycle.

DTACK

OoD

(PU)

Data Acknowledge

oD output only if activated by READY_EN = 1

B and if

motorola bus mode is selected. If not activated (READY_EN

= 0

B) the pull-up resistor is active.

Asynchronous handshake signal to indicate successful read

or write cycle.

READY_EN

Ready Enable

Activates the oD functionality of READY/ DTACK.

B: READY/ DTACK is not activated (only pull-up resistor is

active). Pin READY/ DTACK can be connected to VDD.

B: READY/ DTACK is an active oD output

Table 2

I/O Signals for P-TQFP-144-8 (cont’d)

Pin No.

Name

Pin Type

Buffer

Type

Function

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