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| 91C94 |
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6 page 
6 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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