LAN91C111 datasheet(41/125 Pages) MICROCHIP

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DS00002276A-page 41

LAN91C111

A special BANK (BANK7) exists to support the addition of external registers.

8.4

Bank Select Register

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 the LAN91C111.

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.

Bank 7 is a new register Bank to the Microchip LAN91C111 device. This bank has extended registers that allow the

extended feature set of the Microchip LAN91C111.

TABLE 8-1:

INTERNAL I/O SPACE MAPPING

BANK0

BANK1

BANK2

BANK3

TCR

CONFIG

MMU COMMAND

MT0-1

EPH STATUS

BASE

PNR

MT2-3

RCR

IA0-1

FIFO PORTS

MT4-5

COUNTER

IA2-3

POINTER

MT6-7

MIR

IA4-5

DATA

MGMT

RPCR

GENERAL PURPOSE

DATA

REVISION

RESERVED

CONTROL

INTERRUPT

RCV

BANK

OFFSET

NAME

TYPE

SYMBOL

BANK SELECT REGISTER

READ/WRITE

BSR

HIGH

BYTE

Reserved

001

100

LOW

BYTE

BS2

BS1

BS0

XXX

Note:

The bank select register can be accessed as a doubleword at offset 0x0Ch, as a word at offset 0x0Eh, or

as a byte at offset 0x0Eh, A doubleword write to offset 0x0Ch will write the BANK SELECT REGISTER but

will not write the registers 0x0Ch and 0x0Dh, but will only write to register 0x0Eh.

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 the LAN91C111.

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