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