LAN91C94 datasheet(31/120 Pages) SMSC

31 / 120 page

ATTRIBUTE MEMORY SPACE

(PCMCIA mode only)

In PCMCIA mode, the attribute memory space is

an eight bit space decoded by the LAN91C94

using addresses A0-9, A15 along

with the following control signals: nREG, nCE1,

nWE, nOE.

The LAN91C94 has the following two registers

in memory space:

OFFSET

8000

NAME

CARD OPTION REGISTER

TYPE

READ/WRITE

SYMBOL

COR

This register is used to enable the PCMCIA card, allow programming of the external attribute memory,

and to generate soft reset.

SRESET

LEVIRQ

(read only)

COR2

COR0

SRESET - This bit, when set will reset the

LAN91C94. It is valid in PCMCIA mode only.

The bit does not sample the ISA/PCMCIA mode.

The bit is cleared writing it low or by a hardware

reset. It does not preserve any register. It

resembles a hardware reset, including the

PWRDWN gating.

LEVIRQ - This bit reads always high to indicate

that the LAN91C94 uses level mode interrupts.

COR2 - This bit, when set, allows writing into

the external attribute memory.

COR0 - This bit, when clear, disables the

LAN91C94

I/O

space

and

forces

nIREQ

inactive. This bit defaults low and will be set by

the host PCMCIA system to configure the card

for I/O operation.

LAN91C94 Datasheet(PDF) 31 Page - SMSC Corporation

LAN91C94 Datasheet(HTML) 31 Page - SMSC Corporation

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