GENERAL DESCRIPTION
   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 Attachment 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 transceive

DISTINCTIVE CHARACTERISTICS
■ Integrated Controller with Manchester
   encoder/decoder and 10BASE-T transceiver
   and AUI port
■ Supports IEEE 802.3/ANSI 8802-3 and Ethernet
   standards
■ 84-pin PLCC and 100-pin PQFP Packages
■ 80-pin Thin Quad Flat Pack (TQFP) package
   available for space critical applications such as
   PCMCIA
■ Modular architecture allows easy tuning to
   specific applications
■ High speed, 16-bit synchronous host system
   interface with 2 or 3 cycles/transfer
■ Individual transmit (136 byte) and receive (128
   byte) FlFOs provide increase of system latency
   and support the following features:
   — Automatic retransmission with no FIFO
      reload
   — Automatic receive stripping and transmit
      padding (individually programmable)
   — Automatic runt packet rejection
   — Automatic deletion of collision frames
   — Automatic retransmission with no FIFO
      reload
■ Direct slave access to all on board
   configuration/status registers and transmit/
   receive FlFOs
■ Direct FIFO read/write access for simple
   interface to DMA controllers or l/O processors
■ Arbitrary byte alignment and little/big endian
   memory interface supported
■ Internal/external loopback capabilities
■ External Address Detection Interface (EADI)
   for external hardware address filtering in
   bridge/router applications
■ JTAG Boundary Scan (IEEE 1149.1) test access
   port interface for board level production test
■ Integrated Manchester Encoder/Decoder
■ Digital Attachment Interface (DAI) allows
   by-passing of differential Attachment Unit
   Interface (AUI)
■ Supports the following types of network
   interface:
   — AUI to external 10BASE2, 10BASE5 or
      10BASE-F MAU
   — DAI port to external 10BASE2, 10BASE5,
      10BASE-T, 10BASE-F MAU
   — General Purpose Serial Interface (GPSI) to
      external encoding/decoding scheme
   — Internal 10BASE-T transceiver with
      automatic selection of 10BASE-T or AUI port
■ Sleep mode allows reduced power 
   consumption for critical battery powered applications
■ 5 MHz-25 MHz system clock speed
■ Support for operation in industrial temperature
   range (–40°C to +85°C) available in all three
   packages