91C94 Datasheet, PDF (104/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

t4
A EN
A0-15,
nSBHE
BALE
nIOCS16
nIO RD
nIOWR
VALID
t1
t2
t15
t3
Parameter
m in
typ
max
units
t1 Address, nSBHE Setup to BALE Falling
20
t2 Address, nSBHE Hold after BALE Falling
20
t3 Address, nSBHE, AEN Setup to Control A ctive 25
t4 AEN Hold after Control Inact ive
20
t15 A4-A15, AEN Low, BALE High to nIOCS16 Low
ns
ns
ns
ns
25
ns
t4 not needed. nIOCS16 not relevant in 8-bit mode.
FIGURE 30 - ISA REGISTER ACCESS WHEN USING BALE
104