參數(shù)資料
型號: MC68EN302CAG20BT
廠商: Freescale Semiconductor
文件頁數(shù): 4/8頁
文件大?。?/td> 0K
描述: IC MPU NETWORK 20MHZ 144-LQFP
標(biāo)準(zhǔn)包裝: 60
系列: M683xx
處理器類型: M683xx 32-位
速度: 20MHz
電壓: 5V
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應(yīng)商設(shè)備封裝: 144-LQFP(20x20)
包裝: 托盤
MC68EN302 PRODUCT INFORMATION
MODULE BUS CONTROLLER
The MC68EN302 module bus controller provides basic interface capabilities to the module bus as well as basic
system responsibilities. The features of the module bus controller are:
Interface Between Internal 68000 bus and the Module Bus.
Provision for Dynamic Bus Sizing, Using the Chip Select Logic of the 68302 Core.
Handling of Interrupts for the Ethernet Controller and DRAM Controller.
Coordination of Bus Mastership from External Sources, the Module Bus, and the MC68EN302 Core.
Figure 3. BusStructure
DRAM CONTROLLER
Provides two CAS lines
Provides two RAS lines (two banks supported)
DRAM address multiplexing on standard address bus
Programmable up to three wait states
100 nS DRAM for zero wait states at 20 MHz
80 nS DRAM for zero wait states at 25 MHz
CAS before RAS refresh and refresh support during system reset
MC68EN302
MODULE
BUS
CONTROLLER
ETHERNET AND
MODULE BUS
68000 BUS
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INTERNAL
68000 BUS
EXTERNAL
302 BUS
INTERNAL
B
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F
E
R
S
DRAM CONTROLLER
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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