A8259 データシートの表示（PDF） - Altera Corporation

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A8259

Programmable Interrupt Controller

Altera Corporation 

a8259 Programmable Interrupt Controller Data Sheet

Table 10 describes the interrupt levels acted upon when SL (bit 6 of

OCW 2) is asserted.

Table 10. Interrupt Levels for SL (Bit 6 of OCW 2)

Interrupt Level

0

1

2

3

4

5

6

7

Mnemonic

L2

L1

L0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

Table 11 describes the rotate and EOI commands controlled by bits 5

through 7 of the OCW 2 command register.

Table 11. Rotate & EOI Commands Controlled by Bits 5 Through 7 of OCW 2

R

SL

EOI

Command

0

0

1

Non-specific EOI command

0

1

1

Specific EOI command

1

0

1

Rotate on non-specific EOI command

1

0

0

Rotate on automatic EOI mode (set)

0

0

0

Rotate on automatic EOI mode (clear)

1

1

1

Rotate on specific EOI command (L0,

L1, and L2 are used)

1

1

0

Specific priority command (L0, L1, and

L2 are used)

0

1

0

No operation

OCW 3

OCW 3 is selected by setting the a0 pin, resetting bit 4 low, and bit 3 high.

Input data for OCW 3 is sent via the din[7..0] bus, and the data is

clocked by the rising edge of clk.

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