參數(shù)資料
型號(hào): CD1865
廠商: Intel Corp.
英文描述: Intelligent Eight-Channel Communications Controller
中文描述: 智能八通道通信控制器
文件頁數(shù): 38/150頁
文件大?。?/td> 871K
代理商: CD1865
CD1865
Intelligent Eight-Channel Communications Controller
38
Datasheet
5.5.2
Method 1b
Full Interrupt
Type B, Three-Level
Interrupt with Single-Level Acknowledge
This method is illustrated in
Figure 9
. It is useful with 80X86 systems that use the 8259A Interrupt
Controller. Since the 8259A supplies its own vector to the host when an INTA cycle occurs, the
host can simply read the CD1865
s vector by the method described in the polled interface example
or a separate device select decode can be provided to drive the ACKIN* input.
After the 8259A supplies a vector to the 80X86 host CPU, the host performs a software
acknowledgment to the CD1865, and transfers the CD1865 vector to the host. This allows the
service request to be processed.
Figure 8. Three-Level Interrupt with Three-Level Acknowledge Example
EIGHT-LEVEL
PRIORITY
ENCODER
CD1865 # 2
CD1865 # 1
D0
D7
M68000
MICROPROCESSOR
ADDRESS
DECODE
LOGIC
A1
A3
D0
D7
A8
A23
A4
A7
AS*
IPL1
IPL2
IPL3
A0
A2
A3
A6
CS*
D0
D7
RREQ*
TREQ*
MREQ*
A0
A2
A3
A6
CS*
RREQ*
TREQ*
MREQ*
ACKIN* ACKOUT*
ACKOUT* ACKIN*
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