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ISA Bus Technical Summary(2)

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4.0 ISA Bus Timing Diagrams
8-Bit I/O Bus Cycles
________
BALE __| |_________________________________________
_ ______________________________________________ __
SA(15:0) _><______________________________________________><__
-SBHE
______________ _______
-IOR/W |______________________________|
_____________
SD(7:0) -------------------------------------<_____________>-
(READ)
__________________________________
SD(7:0) ----------------<__________________________________>-
(WRITE)
__________________ _ _ _ _ _ _ _ _ _ _ _ _ _________
I/OCHRDY |________________________|
8-Bit Memory Bus Cycles
_____
BALE ________| |______________________________________
_ ________________ ________________________________
LA(23:17) _><________________><________________________________
_______ ________________________________________ __
SA(19:0) _______><________________________________________><__
______________ _______
-MEMR/W |______________________________|
_____________
SD(7:0) -------------------------------------<_____________>-
(READ)
__________________________________
SD(7:0) ----------------<__________________________________>-
(WRITE)
__________________ _ _ _ _ _ _ _ _ _ _ _ _ _________
I/OCHRDY |________________________|
16-Bit I/O Bus Cycles
________
BALE ______________| |_____________________________
_____________ __________________________________ __
SA(15:0) _____________><__________________________________><__
_________________ ___
-IOCS16 |_______________________________|
_____________________ ______
-IOR/W |________________________|
__________________
SD(15:0) -----------------------------<__________________>----
(READ)
________________________
SD(15:0) -----------------------<________________________>----
(WRITE)
_______________________ _ _ _ _ _ _ _ _ _ _ ______
I/OCHRDY |___________________|
16-Bit Memory Bus Cycles (1 or more Wait States)
______
BALE _________________| |____________________________
___ ________________________ ______________________
LA(23:17) ___><________________________><______________________
________________ ________________________________ _
SA(19:0) ________________><________________________________><_
_______ ______________________
-MEMCS16 |______________________|
________________________ ______
-MEMR/W |_____________________|
_______________
SD(15:0) --------------------------------<_______________>----
(READ)
_____________________
SD(15:0) --------------------------<_____________________>----
(WRITE)
__________________________ _ _ _ _ _ _ _ _ __________
I/OCHRDY |_______________|
16-Bit Memory Bus Cycles (0 Wait State)
______
BALE _________________| |____________________________
___ ________________________ ______________________
LA(23:17) ___><________________________><______________________
________________ _________________________ ________
SA(19:0) ________________><_________________________><________
_______ ______________________
-MEMCS16 |______________________|
_________________________ ______________________
-0WS |____|
________________________ ________________
-MEMR/W |___________|
______
SD(15:0) --------------------------------<______>-------------
(READ)
____________
SD(15:0) --------------------------<____________>-------------
(WRITE)
DMA Read
______________
DRQ(n) __| |___________________________________
_______________ __________
-DACK(n) |__________________________|
____________________________________
AEN,BALE ________| |_______
_______________ ___________________________ _______
SA(15:0) _______________><___________________________><_______
-SBHE
________________ ________________________ _________
SA(19:16) ________________><________________________><_________
LA(23:17)
____________________ __________
-MEMR |_____________________|
____________
SD(15:0) -------------------------------<____________>--------
______________________ ___________
-IOW |__________________|
__________
TC _______________________________| |__________
________________________ _____________________
I/OCHRDY |______|
DMA Write
______________
DRQ(n) __| |___________________________________
_______________ __________
-DACK(n) |__________________________|
____________________________________
AEN,BALE ________| |_______
_______________ ___________________________ _______
SA(15:0) _______________><___________________________><_______
-SBHE
________________ ________________________ _________
SA(19:16) ________________><________________________><_________
LA(23:17)
____________________ __________
-IOR |_____________________|
____________
SD(15:0) -------------------------------<____________>--------
______________________ ___________
-MEMW |__________________|
__________
TC _______________________________| |__________
________________________ _____________________
I/OCHRDY |______|
Alternate Bus Master Cycles
___________________________________
DRQ(n) __| |______________
_______________ __________
-DACK(n) |__________________________|
__________________ _______
-MASTER |__________________________|
__________________ _______
AEN ________| |__________________________| |_
_____________________________________________________
BALE ________| |_
________________________ ___________ ______________
SA(19:0) ________________________><___________><_______________
-SBHE
________________________ ___________ ______________
LA(23:17) ________________________><___________><______________
_____________________________ _________________
-IOR,-IOW |_____|
-MEMR,-MEMW
_____
SD(15:0) -------------------------------<_____>---------------
Memory Refresh Cycles
_______________ _______________
-REFRESH |_____________________|
_________________ ____________ ____________________
SA(9:0) _________________><____________><____________________
______________________ ________________
-SMEMR |_____________|
_________________________ _ _ _ _ ___________________
I/OCHRDY |_______|
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关键词: Technical Summary
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