91C94 Datasheet, PDF (102/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

A0-15
(ISA)
AEN,
nSBHE
nIOCS16
nIOWR
IOCHRDY
Z
VALID ADDRESS
t9
t18
Z
D0-D15
VALI D DATA IN
Parameter
min
typ
max uni ts
t9 Control Active to IO CHRDY Low
t18 IOCHRDY Width when Data Register
is Full
15
ns
425
ns
IOCHRDY i s used instead of meeting t20 and t44.
'No Wait St' bit is 1 - IOCHRDY only negated if needed and only for Data Register
access.
FIGURE 27 - DATA REGISTER SPECIAL WRITE ACCESS
102