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MC68EN302 Datasheet(PDF) 5 Page - Motorola, Inc |
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MC68EN302 Datasheet(HTML) 5 Page - Motorola, Inc |
5 / 8 page MOTOROLA MC68EN302 PRODUCT INFORMATION 5 • Programmable 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 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 ADDRESS 23–ADDRESS 0 BLOCKHIT0 BLOCKHIT1 ADDRESS MULTIPLEXING DRAM ADDRESS ADDRESS DECODE CLK RFRESH TIMER RAS/CAS GENERATION AMUX RAS1, RAS0 CAS1, CAS0 DRAM_RW AS UDS LDS R/W Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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