lan91c95 Standard Microsystems Corp., lan91c95 Datasheet - Page 42

• Manufacturer Part Number: lan91c95
• Description: Isa/pcmcia Full Duplex Single-chip Ethernet And Modem Controller With Ram
• Manufacturer: Standard Microsystems Corp.

Ethernet Function (Base Address 8000h)
8000h - Ethernet Configuration Option Register (ECOR)
BIT 7 - SRESET: This bit when set will clear all
internal registers associated with the Ethernet
function except itself.
BIT 6 - LevIREQ: This bit is read only and reads
as a one to indicate level mode interrupts are
used. Pulse mode interrupts are not supported.
BIT 5 - Not defined
BIT 4 - Not defined
BIT 3 - WRATTRIB: This bit when when set (1),
allows writting into the external attribute memory
space.
BIT 2 - Enable IREQ Routing: This bit enables
(1) or disables (0) the Ethernet function from
asserting nIREQ. The nIREQ pin on power up
and RESET is in a high (1) de-asserted state.
BIT 1 - Enable Base and Limit: This bit enables
the on board I/O base decoder. If set, the on-
SRESET
7
0
LevIREQ
6
1
PCMCIA CONFIGURATION REGISTERS DESCRIPTION
5
0
4
0
42
WRATTRIB
board decoder is used to select the function. If
cleared, the decoder is disabled and it is
assumed that the host provides for the
decoding.
function is enabled, and is configured for 16 bits
(and not in power-down mode), the signal
nIOIS16 is always asserted. It is then up to the
host to qualify the usage of nIOIS16. For
multifunction PCMCIA functionality, this bit
must be set.
BIT 0 - Enable Function: This bit enables (1) or
disables (0) the Ethernet function. While the
Ethernet function is disabled it remains in
powerdown mode, no access to the Ethernet I/O
space is allowed.
accessable). IREQ is not generated for this
function and nINPACK is not returned for
accesses to the Ethernet registers.
If the “Magic Packet” function is enabled, the
device is not completley powered down. The
MAC controller is still enabled to receive.
3
0
When the decode is disabled, the
Enable
IREQ
2
0
(ie. The bank register is not
Base and
Enable
Limit
1
0
Function
Enable
0
0