SMC Networks SMC91C95 Manuel d'utilisateur télécharger pdf (Page 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)

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 138 139

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SMC Networks SMC91C95 Manuel d'utilisateur Page 22