參數(shù)資料
型號(hào)： 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(yè)數(shù)： 3/24頁(yè)
文件大小： 220K
代理商： A8259
Altera Corporation
59
a8259 Programmable Interrupt Controller Data Sheet
Functional
Description
Figure 2
shows the
a8259
block diagram.
Figure 2. a8259 Block Diagram
The
a8259
int
microprocessor via the
the microprocessor’s interrupt input. Whenever the
valid interrupt request on an
goes high.
int
to signal the microprocessor. The
signal and receives an acknowledgment of acceptance from the
ninta
signal. The
and
ninta
signals provide the handshaking mechanism for the
a8259
requests service via the
int
signal is applied directly to
a8259
receives a
through
ir7
), the
ir
pin (
ir1
int
signal
The
acknowledgment signal. The microprocessor pulses the
twice during the interrupt acknowledgment cycle, which tells the
a8259
that the interrupt request has been acknowledged. Then, the
a8259
sends
the highest priority active interrupt type number onto the
din[7..0]
bus for the microprocessor to acknowledge.
ninta
input is connected to the microprocessor’s interrupt
ninta
signal
The
ir
inputs are used by external devices to request service, and they can
be configured for level-sensitive or edge-sensitive operation.
Interrupt
Request
Register
Interrupt
Control
Logic
Read/Write
Control Logic
& Initialization/
Command
Registers
Priority
Resolution
In-Service
Register
Interrupt Vector
ir[7..0]
ninta
nsp
casin[2..0]
clk
nmrst
nrd
nwr
a0
ncs
din[7..0]
int
nen
cas_en
cas_out[2..0]
dout[7..0]
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