SMC91C100 Ver la hoja de datos (PDF) - SMSC -> Microchip

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SMC91C100

FEAST™ Fast Ethernet Controller

SMSC -> Microchip 

BANK SELECT REGISTER

OFFSET

E

NAME

BANK SELECT REGISTER

HIGH BYTE

0

0

1

1

0

0

1

1

TYPE

READ/WRITE

0

0

1

0

0

1

SYMBOL

BSR

1

1

LOW BYTE

BS2

BS1 BS0

X

X

X

X

X

0

0

0

BS2, BS1, BS0 Determine the bank presently in

use. This register is always accessible and is

used to select the register bank in use.

a doubleword write to offset Ch will write the

BANK SELECT REGISTER but will not write the

registers Ch and Dh.

The upper byte always reads as 33h and can be

used to help determine the I/O location of FEAST.

The BANK SELECT REGISTER is always

accessible regardless of the value of BS0-2.

BANK 7 has no internal registers other than the

BANK SELECT REGISTER itself. On valid cycles

where BANK7 is selected (BS0=BS1=BS2=1),

and A3=0, nCSOUT is activated to facilitate

implementation of external registers.

Note that the bank select register can be

accessed as a doubleword at offset Ch, as a word

at offset Eh, or as at offset Fh, however

Note: BANK7 does not exist in SMC91C9x

devices. For backward S/W compatibility BANK7

accesses should be done if the Revision Control

register indicates the device is SMC91C100.

21

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