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PDF MC68EN302 Data sheet ( Hoja de datos )
| Número de pieza | MC68EN302 | |
| Descripción | Integrated Multiprotocol Processor | |
| Fabricantes | Motorola Semiconductors | |
| Logotipo |  |
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Freescale Semiconductor, Inc.
www.DataSheet4U.com
Microprocessor and Memory
Technologies Group
Order this document by
MC68EN302/D
MC68EN302
Product Brief
Integrated Multiprotocol Processor with Ethernet
Motorola introduces a version of the well-known MC68302 Integrated Multiprotocol Processor (IMP) with
Ethernet and DRAM controllers. It is known as the MC68EN302, and expands a family of devices based on the
MC68302.
The Ethernet controller has a 16-bit interface, resides on the 68000 bus and provides complete IEEE 802.3
compatibility. The programming model is adopted from the standard 68302 programming model. The DRAM
controller is adopted from the MC68306 product. It is enhanced to support both parity and external bus masters.
The MC68EN302 is packed in a low profile 144 TQFP.
MC68302
MC68EN302
MC68000
INTERRUPT
CONTROLLER
1 GENERAL-
PURPOSE
DMA
CHANNEL
3 TIMERS
AND
ADDITIONAL
FEATURES
68000
SYSTEM BUS
JTAG
IEEE 1149.1
MICROCODED
COMMUNICATIONS
CONTROLLER
(RISC)
6 DMA
CHANNELS
1152 BYTES
DUAL-PORT
RAM
PERIPHERAL
BUS
OTHER
SERIAL
CHANNELS
3 SERIAL
CHANNELS
MODULE BUS
CONTROLLER
ETHERNET
CONTROLLER
DRAM
CONTROLLER
Figure 1. MC68EN302 Block Diagram
This document contains information on a product under development. Motorola reserves the right to change or discontinue this product without notice.
© MOTOROLA, 1995
SEMICONDUCTOR PRODUCT INFORMATION
For More Information On This Product,
Go to: www.freescale.com
1 page  
Freescale Semiconductor, Inc.
www.Da•taSPhreoegt4raUm.commable refresh period and pre-charge period
• RAS lines are separate from the four chip selects
• Refresh hidden from bus accesses
• Write protect option
• Each bank programmable size from 128Kbytes to 8Mbytes
ADDRESS 23–ADDRESS 0
BLOCKHIT0
BLOCKHIT1
ADDRESS
MULTIPLEXING
DRAM ADDRESS
ADDRESS
DECODE
CLK RFRESH
TIMER
AMUX
AS RAS1, RAS0
UDS
RAS/CAS
CAS1, CAS0
GENERATION
LDS DRAM_RW
R/W
Figure 4. DRAM Controller
MC68EN302 APPLICATIONS
The MC68EN302 is intended for low-end bridge and router applications. It has the three SCCs from the
MC68302, plus an additional Ethernet interface giving it a total of four serial interfaces.
Since the MC68EN302 has both the three SCCs as well as an Ethernet interface, it would be an excellent
choice in an ISDN to Ethernet router.
For remote access dial-in, the MC68EN302 could be used in a dial-up modem that would connect to an
Ethernet LAN.
• Low End Bridges
MOTOROLA
MC68EN302 PRODUCT INFORMATION
5
For More Information On This Product,
Go to: www.freescale.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MC68EN302.PDF ] | |
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