91C94 Datasheet, PDF (101/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

A 0-15
(ISA )
AEN ,
nSB HE
nIOCS16
nIORD
Z
IOC HRDY
D 0 -D 1 5
VALID A DDRESS
t9
t18
Z
t19
VALID DATA
OUT
Parameter
mi n
t yp
max
t 9 Cont rol Active to IOCHRDY Low
15
t18 IOC HRDY Widt h when Data is Unav ai lable at
Data Register
575
t19 Valid Data to IOCHRD Y I nact ive
225
IOCHRDY is used inst ead of meet ing t20 and t44.
"No Wait St' bi t is 1 - IOCH RDY only negated if needed and only for Data Register access.
units
ns
ns
ns
FIGURE 26 - DATA REGISTER SPECIAL READ ACCESS
101