AM79C961 datasheet(2/173 Pages) AMD

2 / 173 page

P R E L I M I N A R Y

AMD

1-476

Am79C961

the integrated DMA controller. This configuration en-

hances

system

performance

allowing

the

PCnet-ISA+ controller to bypass the platform DMA con-

troller and directly address the full 24-bit memory space.

The implementation of Bus Master Mode allows mini-

mum parts count for the majority of PC applications. The

PCnet-ISA+ controller can be configured to perform

Shared Memory operations for compatibility with low-

end machines, such as PC/XTs that do not support Bus

Master and high-end machines that require local packet

buffering for increased system latency.

The PCnet-ISA+ controller is designed to directly inter-

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

Plug and Play bus interface unit, DMA Buffer Manage-

ment Unit, 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 Attach-

ment Unit. The PCnet-ISA+ controller is also register

compatible with the LANCE (Am7990) Ethernet control-

ler and PCnet-ISA. The DMA Buffer Management Unit

supports the LANCE descriptor software model.

External remote boot and Ethernet physical address

PROMs and Electrically Erasable 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 integrity

and activity, or jabber status. The PCnet-ISA+ controller

also provides an External Address Detection Interface

™

(EADI

™) to allow external hardware address filtering in

internetworking applications.

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