AM79C976 datasheet(3/309 Pages) AMD

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8/01/00

Am79C976

P R E L I M INARY

GENERAL DESCRIPTION

The Am79C976 controller is a highly-integrated 32-bit

full-duplex, 10/100-Megabit per second (Mbps) Ether-

net controller solution, designed to address high-

performance system application requirements. It is a

flexible bus mastering device that can be used in any

application, including network-ready PCs and bridge/

router designs. The bus master architecture provides

high data throughput and low CPU and system bus uti-

lization. The Am79C976 controller is fabricated with

advanced low-power 3.3-V CMOS process to provide

low operating current for power sensitive applications.

The Am79C976 controller also has several enhance-

ment s o ver its p r edecessor, th e Am79C971

PCnet-FAST device. In addition to providing access to

a larger SSRAM, it further reduces system implemen-

tation cost by the addition of a new EEPROM program-

mable pin (PHY_RST) and the integration of the PAL

function needed for Magic Packet application. The

PHY_RST pin is implemented to reset the external

PHY without increasing the load to the PCI bus and to

block RST to the PHY when PG input is LOW.

The 32-bit multiplexed bus interface unit provides a di-

rect interface to the PCI local bus, simplifying the de-

sign of an Ether net node in a PC system. The

Am79C976 controller provides the complete interface

to an Expansion ROM or Flash device allowing add-on

card designs with only a single load per PCI bus inter-

face pin. With its built-in support for both little and big

endian byte alignment, this controller also addresses

non-PC applications. The Am79C976 controller’s

advanced CMOS design allows the bus interface to be

connected to either a +5-V or a +3.3-V signaling envi-

ronment. An IEEE 1149.1-compliant JTAG test inter-

face for board-level testing is also provided.

The Am79C976 controller is also compliant with the

PC97, PC98, PC99, and Network PC (Net PC) specifi-

cations. It includes the full implementation of the Mi-

crosoft OnNow and ACPI specifications, which are

backward compatible with the Magic Packet technol-

ogy, and it is compliant with the PCI Bus Power Man-

agement Interface Specification by supporting the four

power management states (D0, D1, D2, and D3), the

optional PME pin, and the necessary configuration and

data registers.

The Am79C976 controller is ideally suited for Net PC,

motherboard, network interface card (NIC), and em-

bedded designs. It is available in a 208-pin Plastic

Quad Flat Pack (PQFP) package.

The Am79C976 controller contains a bus interface unit,

a DMA Buffer Management Unit, an ISO/IEC 8802-3

(IEEE 802.3)-compliant Media Access Controller

(MAC), and an IEEE 802.3-compliant MII. An interface

to an external RAM of up to 4 Mbytes is provided for

frame storage. The MII supports IEEE 802.3-compliant

full-duplex and half-duplex operations at 10 Mbps or

100 Mbps. The MII TX and RX clock signals can be

stopped independently for home networking applica-

tions.

The Am79C976 controller is register compatible with

the LANCE™ (Am7990) and C-LANCE™ (Am79C90)

Ethernet controllers, and all Ethernet controllers in the

PCnet Family except ILACC™ (Am79C900), including

t he

PC net ™- ISA

cont r o ller

( A m 79C 960) ,

PC n e t ™ -I SA+ (A m79 C 96 1), PC n e t ™ -ISA II

(Am79C961A), PCnet™-32 (Am79C965), PCnet™-

PCI (Am79C970), PCnet™-PCI II (Am79C970A), and

the PCnet™-FAST (Am79C971).

The Buffer Management Unit supports the LANCE and

PCnet descriptor software models.

The Am79C976 controller supports auto-configuration

in the PCI configuration space. Additional Am79C976

controller configuration parameters, including the

unique IEEE physical address, can be read from an ex-

ternal nonvolatile memory (EEPROM) immediately fol-

lowing system reset.

In addition, the device provides programmable on-chip

LED drivers for transmit, receive, collision, link integrity,

Magic Packet status, activity, address match, full-

duplex, or 100 Mbps status. The Am79C976 controller

also provides an EADI to allow external hardware ad-

dress filtering in internetworking applications and a

receive frame tagging feature.

With the rise of embedded networking applications op-

erating in harsh environments where temperatures

may exceed the normal commercial temperature (0

to +70

C) window, an industrial temperature (-40 C to

+85

C) version is available. This industrial temperature

version of the PCnet-PRO Ethernet controller is char-

acterized across the industrial temperature range (-40

C to +85

C) within the published power supply specifi-

cation (4.75V to 5.25V;

±5% Vcc). Thus, conformance

of the PCnet-PRO performance over this temperature

range is guaranteed by a design and characterization

monitor.

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