第九章.ppt - 9 IC IC IC(ASIC PLD PLD PLA,PAL,GAL...

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1 概述 : 半导体存储器指能够存储大量二值数据的半导体器 件,按功能可分为: 只读存储器( READ ONLY MEMORY ROM 信息数据可长期掉电保存于器件之 随机存取存储器( RANDOM ACCESMEMORY RAM 9 章 存储器 数字 IC 通用 IC 专用 IC(ASIC) PLD PLD 存储器 PLA,PAL,GAL FPGA,CPLD
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2 Memory Construct with a binary decoder and a memory array !
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3 Memory Data bits are stored in a structured way Once a word line is selected, all the bits in this line can be in output through the bit lines !
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4 Memory Example: When a2a1a0= 000, y4y3y2y1= 1000; When a2a1a0= 101, y4y3y2y1= 0110;
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5 Memory A memory can be treated as a combinational circuit ! A truth table is stored in the memory array ! Each bit line is a function output !
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6 ROM 只读存储器 端口: 地址输入 数据输出 规格表达: 存储单元数(字数) 位数;注意与地址输 入端的关系。 Memory
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7 Memory Example: 0 1 2 1 2 4 7 1 a a a m m m m y
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