参数资料
型号: 85C30
厂商: Advanced Micro Devices, Inc.
英文描述: Enhanced Serial Communications Controller
中文描述: 增强的串行通信控制器
文件页数: 24/68页
文件大小: 528K
代理商: 85C30
AMD
24
Am85C30
Interrupt Acknowledge Cycle Timing
NO TAG illustrates Interrupt Acknowledge cycle timing.
Between the time
INTACK
goes Low and the falling
edge of
RD
, the internal and external IEI/IEO daisy
chains settle. If there is an interrupt pending in the ESCC
and IEI is High when
RD
falls, the Acknowledge cycle is
intended for the SCC. In this case, the ESCC may be
programmed to respond to
RD
Low by placing its inter-
rupt vector on D
7
–D
0
; it then sets the appropriate Inter-
rupt-Under-Service latch internally.
Address Valid
Data Valid
A/
B
, D/
C
INTACK
CE
WR
D
7
–D
0
Figure 10. Read Cycle Timing
10216F-14
Address Valid
Data Valid
A/
B
, D/
C
INTACK
CE
WR
D
7
–D
0
Figure 11. Write Cycle Timing
10216F-15
Vector
INTACK
RD
D
7
–D
0
Figure 12. Interrupt Acknowledge Cycle Timing
10216F-16
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