CD1865 datasheet(39/150 Pages) INTEL

Part #	CD1865

Description	Intelligent Eight-Channel Communications Controller

PDF	150 Pages

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Manufacturer	INTEL [Intel Corporation]

Direct Link	http://www.intel.com

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39 / 150 page

Intelligent Eight-Channel Communications Controller — CD1865

Datasheet

5.5.3

Method 2b — Interrupt Interface, Single-Level

Interrupt with Single-Level Acknowledge

This method is illustrated in Figure 10. It is best-suited to host systems having a single interrupt

input. The three service request lines from the CD1865 are run through an ‘OR’ gate to the host’s

interrupt input. When an interrupt occurs, the host system polls the CD1865s, determines which of

the three levels is interrupted, and acknowledges it accordingly.

Figure 9. Three-Level Interrupt with Single-Level Acknowledge Example

INTERRUPT

CONTROLLER

(8259A OR

EQUIVALENT)

CD1865 # 1

CD1865 # 2

MICROPROCESSOR

ADDRESS

DECODE

LOGIC

A1–A3

A8–A23

A4–A7

D0–D7

ALE

INT

A0–A2

A3-A6

CS*

D0–D7

RREQ*

TREQ*

MREQ*

A0–A2

A3–A6

CS*

D0–D7

RREQ*

TREQ*

MREQ*

ACKIN*

ACKOUT*

ACKIN*

CD1865 Datasheet(PDF) 39 Page - Intel Corporation

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