LAN91C100 Просмотр технического описания (PDF) - SMSC -> Microchip

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LAN91C100

FEAST™ Fast Ethernet Controller

SMSC -> Microchip 

BANK SELECT REGISTER

OFFSET

NAME

E

BANK SELECT REGISTER

HIGH

0

0

1

1

BYTE

0

0

1

1

TYPE

READ/WRITE

SYMBOL

BSR

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. This register is always accessible 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

FEAST.

The BANK SELECT REGISTER is always

accessible regardless of the value of BS0-2.

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

a doubleword write to offset Ch will write the

BANK SELECT REGISTER but will not write the

registers Ch and Dh.

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: BANK7 does not exist in LAN91C9x

devices. For backward S/W compatibility

BANK7 accesses should be done if the Revision

Control register indicates the device is

LAN91C100.

22

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