CD1865 datasheet(39/150 Pages) INTEL

部件名	CD1865

功能描述	Intelligent Eight-Channel Communications Controller

PDF	150 Pages

Scroll/Zoom	100%

制造商	INTEL [Intel Corporation]

网页	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 数据表(PDF) 39 Page - Intel Corporation

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CD1865 数据表(PDF) 39 Page - Intel Corporation

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