A8259 查看數據表（PDF） - Altera Corporation

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A8259

Programmable Interrupt Controller

Altera Corporation 

a8259 Programmable Interrupt Controller Data Sheet

Figure 3. a8259 Initialization Sequence Flow Diagram

ICW 1

ICW 2

Is SINGLE Yes

low?

Note (1)

No

ICW 3

Is

IC4

Yes

high?

Note (1)

No

ICW 4

Ready to

accept

interrupts

Note:

(1) For more information on SINGLE and IC4, see Table 3 on page 62.

Figures 4 and 5 show typical write and read cycles, respectively. The ncs,

nwr, and nrd signals enable data to be written to and read from the

a8259. This data is clocked by the rising edge of clk. The ncs and nwr

signals must be held low for an entire clock cycle in order to read or write

valid data.

Figure 4. Typical Write Cycle

X indicates “don’t care.” DV indicates “data valid.”

clk

nwr

ncs

din[7..0]

X

DV

X

Altera Corporation

61

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