91C94 Datasheet, PDF (103/120 Pages) SMSC Corporation – ISA/PCMCIA SINGLE CHIP ETHERNET CONTROLLER WITH RAM

A0-15
(IS A)
AEN
nIOWR
t3
nIORD
Z
D0-7
VALID ADDRE SS
t5
VALID DATA OUT
VALID ADDRE SS
t3
t7
t8
Z
VALID DATA IN
Parameter
m in
typ
max
uni ts
t3
Address, nSBHE , AEN Setup to Control Acti ve 25
t5
nIORD Low to Valid Data
t7
Data Setup to nIOWR Rising
30
t8
Data Hold after nIOWR Rising
9
ns
40
ns
ns
ns
FIGURE 28 – 8 BIT MODE REGISTER CYCLES
A0-19
t3
nMEMRD
ADDRESS VALID
D0-15
Z
Parameter
t3
Address Setup to Control Act ive
t4
Address Hold after Control Inactive
t16
nMEMRD Low to nROM Low
t17
nMEM RD High to nROM High
BALE tied high
t4
min
typ
max
units
25
ns
20
ns
0
25
ns
0
30
ns
FIGURE 29 – EXTERNAL ROM READ ACCESS
103