AM79C940JC/W AMD [Advanced Micro Devices], AM79C940JC/W Datasheet - Page 2
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AM79C940JC/W
Manufacturer Part Number
AM79C940JC/W
Description
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79C940JCW.pdf
(144 pages)
- Current page: 2 of 144
- Download datasheet (2Mb)
The MACE device provides a complete Ethernet node
solution with an integrated 10BASE-T transceiver, and
supports up to 25-MHz system clocks. The MACE
device embodies the Media Access Control (MAC)
and Physical Signaling (PLS) sub-layers of the IEEE
802.3 standard, and provides an IEEE defined Attach-
ment Unit Interface (AUI) for coupling to an external
Medium Attachment Unit (MAU). The MACE device is
compliant with 10BASE2, 10BASE5, 10BASE-T, and
10BASE-F transceivers.
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 in
internet working applications.
2
Am79C940
The Am79C940 MACE chip is offered in a Plastic
Leadless Chip Carrier (84-pin PLCC), a Plastic Quad
Flat Package (100-pin PQFP), and a Thin Quad Flat
Package (TQFP 80-pin). There are several small func-
tional and physical differences between the 80-pin
TQFP and the 84-pin PLCC and 100-pin PQFP config-
urations. Because of the smaller number of pins in the
TQFP configuration 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 differ-
ences between the TQFP and the PLCC and PQFP
configurations. Depending on the application, the
removal of these pins will or will not have an effect.
(See section: “Pins Removed for TQFP Package and
Their Effects.)
With the rise of embedded networking applications op-
erating in harsh environments where temperatures
may exceed the normal commercial temperature (0 C
to +70 C) window, an industrial temperature (-40 C to
+85 C) version is available in all three packages; 84-
pin PLCC, 100-pin PQFP and 80-pin TQFP. The indus-
trial temperature version of the MACE Ethernet control-
ler is characterized across the industrial temperature
range (-40 C to +85 C) within the published power
supply specification (4.75 V to 5.25 V; i.e., 5% V
Thus, conformance of MACE performance over this
temperature range is guaranteed by the design and
characterization monitor.
CC
).
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