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SMC91C95

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

SMSC -> Microchip 

FUNCTIONAL DESCRIPTION

The SMC91C95 consists of an integrated Ethernet

controller mapped entirely in I/O space, as well as

support for an external Modem controller also

mapped in I/O space. In addition, PCMCIA

attribute memory space is decoded to interface an

external CIS ROM, with configuration registers as

per PCMCIA 3.X extensions implemented on-chip

in attribute space above the CIS ROM decode

area. The PCMCIA Configuration Registers are

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

dual function designs.

The Ethernet controller function includes a built-in

6kbyte RAM for packet storage. This RAM buffer

is accessed by the CPU through two sequential

access regions of 3 kbytes each. The RAM access

is internally arbitrated by the SMC91C95 and

dynamically allocated between transmit and

receive packets using 256 byte pages. The

Ethernet controller functionality is identical to the

SMC91C94 except where indicated otherwise.

Table 1 - Bus Transactions in ISA Mode

8 BIT MODE

(nEN16=1)

(16 BIT=0)

16 BIT MODE

otherwise

A0 nSBHE

D0-D7

0

X

even byte

D8-D15

-

1

X

odd byte

-

0

0

even byte

odd byte

0

1

even byte

-

1

0

-

odd byte

1

1

invalid cycle

21

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