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參數(shù)資料
| 型號： | a8259 |
| 廠商： | Altera Corporation |
| 英文描述： | Programmable Interrupt Controller(可編程中斷控制器) |
| 中文描述： | 可編程中斷控制器（可編程中斷控制器） |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 220K |
| 代理商： | A8259 |
Altera Corporation
61
a8259 Programmable Interrupt Controller Data Sheet
Figure 3. a8259 Initialization Sequence Flow Diagram
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 “dont care.” DV indicates “data valid.”
ICW 1
ICW 2
ICW 3
ICW 4
Ready to
accept
interrupts
Is SINGLE
low
Note (1)
Is
IC4
high
Note (1)
Yes
Yes
No
No
Note:
(1) For more information on SINGLE and IC4, see Table 3 on page 62.
X
X
DV
clk
nwr
ncs
din[7..0]
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