AM79C971VCW datasheet(3/265 Pages) AMD

3 / 265 page

Am79C971

In addition, the device provides programmable on-chip

LED drivers for transmit, receive, collision, receive po-

larity, link integrity, activity, link active, address match,

full-duplex, MII select, 100 Mbps, or jabber status. The

Am79C971 controller also provides an EADI to allow

external hardware address filtering in internetworking

applications and a receive frame tagging feature.

For power sensitive applications where low standby

current is desired, the device incorporates two sleep

functions to reduce overall system power consumption,

excellent for notebooks and green PCs. In conjunction

with these low power modes, the PCnet-FAST control-

ler also has integrated functions to support Magic

Packet technology, an inexpensive technology that al-

lows remote wake up of networked PCs.

The controller has the capability to automatically select

either the MII, AUI, or Twisted-Pair transceiver. Only

one interface is active at any one time. Any of the net-

work interfaces can be programmed to operate in either

half-duplex or full-duplex mode (AUI full-duplex only

supports the 10BASE-F standard).

The dual Transmit and Receive FIFOs optimize system

overhead, providing sufficient latency tolerance at 10

Mbps and for 100-Mbps systems where low latencies

can be guaranteed during frame transmission and

reception.

In highly loaded 10-Mbps systems, such as servers or

when using the controller in a 100-Mbps environment,

the additional frame buffering capability provided by a

16-bit wide SRAM interface provides high performance

and high latency tolerance on the system bus and net-

work.

The Am79C971 controller can use up to 128 Kbytes of

SRAM as an extension of its dual Transmit and Receive

FIFOs. When no SRAM is used, the Am79C971 con-

troller’s FIFOs are programmed to bypass the SRAM

interface.

IMPORTANT NOTE: A “No SRAM configuration” is only

valid for 10Mb mode. In 100Mb mode, SRAM is man-

datory and must always be used.

ISO/IEC 8802-3 and IEEE 802.3 will be used inter-

changeably when referring to half-duplex 10 Mbps net-

works. IEEE 802.3 or IEEE 802.3u will be used

interchangeably only when referring to half-duplex 100-

Mbps Ethernet networks, since the IEEE standard is

not ISO approved yet. Full-duplex is a proprietary stan-

dard and is not approved by IEEE or ISO.

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