SMC Networks SMC91C95 Manuel d'utilisateur télécharger pdf (Page 39)

BANK SELECT REGISTER

OFFSET NAME TYPE SYMBOL

E BANK SELECT

READ/WRITE BSR

HIGH

BYTE

0 0 1 1 0 0 1 1

LOW

BYTE

BS2 BS1 BS0

X X X X X 0 0 0

BS2, BS1, BS0 - Determine the bank presently in

use.

The BANK SELECT REGISTER is always

accessible except in PCMCIA powerdown mode

and is used to select the register bank in use.

The upper byte always reads as 33h and can be

used to help determine the I/O location of the

SMC91C95.

The BANK SELECT REGISTER is always

accessible regardless of the value of BS0-BS2.

The SMC91C95 implements only four banks in

ISA mode, therefore, accesses to non-existing

banks (BS2=1) are ignored. All six banks are

accessible in PCMCIA mode.

BS2 BS1 BS0 BANK#

None

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 138 139

Pas de commentaire

SMC Networks SMC91C95 Manuel d'utilisateur Page 39