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CD1865 データシート(PDF) 39 Page - Intel Corporation

部品番号 CD1865
部品情報  Intelligent Eight-Channel Communications Controller
PDF  150 Pages
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メーカー  INTEL [Intel Corporation]
ホームページ  http://www.intel.com
Logo INTEL - Intel Corporation

CD1865 データシート(HTML) 39 Page - Intel Corporation

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Intelligent Eight-Channel Communications Controller — CD1865
Datasheet
39
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*
ACKOUT*
ACKIN*



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