SMC Networks SMC91C95 Product Manual page 22

8 BIT MODE
((IOis8=1) + (nEN16=1).(16BIT=0))
16 BIT MODE
otherwise
16BIT = CONFIGURATION REGISTER bit 7
IOis8 = ECSR register bit 5
nEN16 = pin nEN16
For the modem function, the transactions are similarxcept that the modem is assumed to be 8 bit wide
unless (IOis8=0) and (nMIS16=0).
NOTE: The IOis8 value should be identical in MCSR and ECSR if both functions are enabled.
8 Bit mode = (IOis8=1)+(nMIS16=1)
Table 2 - Bus Transactions in PCMCIA Mode
A0 nCE1
0
1
X
0
0
1
X
X
22
nCE2 D0-D7
0 X even byte
0 X odd byte
1 X
0 0 even byte
0 1 even byte
0 1 odd byte
1 0
1 1
D8-D15
-
-
NO CYCLE
odd byte
-
- odd byte
NO CYCLE