91C94 Просмотр технического описания (PDF) - SMSC -> Microchip

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91C94

ISA/PCMCIA Single-Chip Ethernet Controller with RAM

SMSC -> Microchip 

The LAN91C94 offers:

High integration:

Single chip adapter including:

Packet RAM

ISA bus interface

PCMCIA interface

EEPROM interface

Encoder decoder with AUI interface

10BASE-T transceiver

High performance:

Chained ("Back-to-back") packet handling

with no CPU intervention:

Queues transmit packets

Queues receive packets

Stores results in memory along with

packet

Queues interrupts

Optional single interrupt upon

completion of transmit chain.

Fast block move operation for load/unload:

CPU sees packet bytes as if stored

contiguously.

Handles 16 bit transfers regardless of

address alignment.

Access to packet through fixed window.

Fast bus interface:

Compatible with ISA type and faster buses.

Flexibility:

Flexible packet and header processing:

Can be set to Simultasking - Early

Receive and Transmit modes.

Can access any byte in the packet.

Can immediately remove undesired

packets from queue.

Can move packets from receive to

transmit queue.

Can alter receive processing order

without copying data.

Can discard or enqueue again a failed

transmission.

Resource allocation:

Memory dynamically allocated for transmit

and receive.

Can automatically release memory on

successful transmission.

Configuration:

ISA:

Uses non-volatile jumperless setup via

serial EEPROM.

PCMCIA:

Uses ROM or Flash ROM for attribute

memory storage and optional serial

EEPROM for IEEE address storage.

PCMCIA I/O ignores address lines A4-

A15 and relies on the PCMCIA host,

decoding for the slot.

nROM/nPCMCIA, on LAN91C94, is left

open with a pullup for ISA mode. This

pin is sampled at the end of RESET. If

found low, the LAN91C94 is configured

for PCMCIA mode.

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