AM79C960 datasheet(2/127 Pages) AMD

2 / 127 page

P R E L I M I N A R Y

AMD

1-344

Am79C960

The PCnet-ISA controller is designed to directly inter-

face with the ISA or EISA system bus. It contains an ISA

bus interface unit, DMA Buffer Management Unit, IEEE

802.3 Media Access Control function, individual

136-byte transmit and 128-byte receive FIFOs, IEEE

802.3 defined Attachment Unit Interface (AUI), and a

Twisted Pair Transceiver Media Attachment Unit. The

PCnet-ISA controller is also register compatible with the

LANCE (Am7990) Ethernet controller. The DMA Buffer

Management Unit supports the LANCE descriptor soft-

ware model. External remote boot and Ethernet

physical address PROMs are also supported.

This advanced Ethernet controller has the built-in capa-

bility of automatically selecting either the AUI port or the

Twisted Pair transceiver. Only one interface is active at

any one time. The individual 136-byte transmit and

128-byte receive FIFOs optimize system overhead, pro-

viding sufficient latency during packet transmission and

reception, and minimizing intervention during normal

network error recovery. The integrated Manchester en-

coder/decoder eliminates the need for an external Serial

Interface Adapter (SIA) in the node system. If support

for an external encoding/decoding scheme is desired,

the embedded General Purpose Serial Interface (GPSI)

allows direct access to/from the MAC. In addition, the

device provides programmable on-chip LED drivers for

transmit, receive, collision, receive polarity, link integ-

rity, or jabber status. The PCnet-ISA controller also

provides an External Address Detection Interface

™

(EADI

™) to allow external hardware address filtering in

internetworking applications.

AM79C960 数据表(PDF) 2 Page - Advanced Micro Devices

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