LAN91C95 Ver la hoja de datos (PDF) - SMSC -> Microchip

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LAN91C95

ISA/PCMCIA Full Duplex Single-Chip Ethernet and Modem Controller with RAM

SMSC -> Microchip 

FUNCTIONAL DESCRIPTION

The LAN91C95 consists of an integrated Ethernet The Ethernet controller function includes a built-in

controller mapped entirely in I/O space, as well as 6kbyte RAM for packet storage. This RAM buffer is

support for an external Modem controller also accessed by the CPU through two sequential

mapped in I/O space. In addition, PCMCIA attribute access regions of 3 kbytes each. The RAM access

memory space is decoded to interface an external is internally arbitrated by the LAN91C95 and

CIS ROM, with configuration registers as per dynamically allocated between transmit and

PCMCIA 3.X extensions implemented on-chip in receive packets using 256 byte pages. The

attribute space above the CIS ROM decode area. Ethernet controller functionality is identical to the

The PCMCIA Configuration Registers are also LAN91C94 except where indicated otherwise.

accessible in I/O space to allow non-PCMCIA dual

function designs.

Table 1 - Bus Transactions In Isa Mode

A0 nSBHE

D0-D7

D8-D15

8 BIT MODE

0

X

even byte

-

(nEN16=1)

(16 BIT=0)

1

X

odd byte

-

16 BIT MODE

0

0

even byte

odd byte

otherwise

0

1

even byte

-

1

0

-

odd byte

1

1

invalid cycle

20

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