AM79C940VCW datasheet(2/122 Pages) AMD

2 / 122 page

AMD

Am79C940

Additional features also enhance over-all system

design. The individual transmit and receive FIFOs

optimize

system

overhead,

providing

substantial

latency during packet transmission and reception, and

minimizing intervention during normal network error

recovery. The integrated Manchester encoder/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

General Purpose Serial Interface (GPSI) allows direct

access to/from the MAC. In addition, the Digital Attach-

ment Interface (DAI), which is a simplified electrical

attachment specification, allows implementation of

MAUs that do not require DC isolation between the MAU

and DTE. The DAI port can also be used to indicate

transmit, receive, or collision status by connecting LEDs

to the port. The MACE device also provides an External

Address Detection Interface (EADI) to allow external

hardware

address

filtering

internetworking

applications.

The Am79C940 MACE chip is offered in a Plastic Lead-

less Chip Carrier (84-pin PLCC), a Plastic Quad Flat

Package (100-pin PQFP), and a Thin Quad Flat Pack-

age (TQFP 80-pin). There are several small functional

and physical differences between the 80-pin TQFP and

the 84-pin PLCC and 100-pin PQFP configurations.

Because of the smaller number of pins in the TQFP con-

figuration versus the PLCC configuration, four pins are

not bonded out. Though the die is identical in all three

package configurations, the removal of these four pins

does cause some functionality differences between the

TQFP and the PLCC and PQFP configurations. De-

pending on the application, the removal of these pins will

or will not have an effect.

BLOCK DIAGRAM

DBUS 15-0

ADD 4-0

FDS

DTV

EOF

RDTREQ

TDTREQ

BE 1–0

INTR

SCLK

EDSEL

SLEEP

RESET

16235C-1

XTAL1

FIFO

Control

EADI Port

Bus

Interface

Unit

802.3

MAC

Core

ENCODER/

DECODER

(PLS)

XMT FIFO

RCV FIFO

Command

& Status

Registers

JTAG

PORT CNTRL

TCK

TDI

TMS

TDO

XTAL2

EADI

Port

Control

AUI

Port

10BASE-T

MAU

DAI

Port

GPSI

Port

DXCVR

CLSN

SRDCLK

SRD

SF/BD

EAM/R

TXD

TXP

RXD

LNKST

RXPOL

TXDAT

TXEN

RXDAT

RXCRS

STDCLK

TXDAT+

TXEN

SRDCLK

RXDAT

RXCRS

CLSN

AUI

10BASE-T

DAI Port

GPSI

Notes:

1. Only one of the network ports AUI, 10BASE-T, DAI port or GPSI can be active at any time. Some shared signals are active

regardless of which network port is active, and some are reconfigured.

2. The EADI port is active at all times.

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