A0-15 (ISA) AEN, nSBHE

nIOCS16

nIORD

Z

IOCHRDY

D0-D15

VALID ADDRESS

t9

t18

Z

 

t19

VALID DATA

OUT

 

Parameter

min

typ

max

units

 

 

 

 

 

 

t9

Control Active to IOCHRDY Low

 

 

15

ns

t18

IOCHRDY Width when Data is Unavailable at

 

 

 

 

 

Data Register

 

 

575

ns

t19

Valid Data to IOCHRDY Inactive

 

 

225

ns

 

 

 

 

 

 

IOCHRDY is used instead of meeting t20 and t43.

"No Wait St' bit is 1 - IOCHRDY only negated if needed and only for Data Register access.

FIGURE 30 - DATA REGISTER SPECIAL READ ACCESS

122

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Image 122
SMC Networks SMC91C95 manual Data Register Special Read Access, 122