SMC Networks SMC91C95 - Manual (Page 22)

22
Table 2 - Bus Transactions in PCMCIA Mode
A0 nCE1 nCE2 D0-D7 D8-D15
8 BIT MODE
((IOis8=1) + (nEN16=1).(16BIT=0))
0 0 X even byte -
1 0 X odd byte -
X 1 X NO CYCLE
16 BIT MODE 0 0 0 even byte odd byte
otherwise 0 0 1 even byte -
1 0 1 odd byte
X 1 0 - odd byte
X 1 1 NO CYCLE
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)