TAILIEUCHUNG - Bài giảng Computer Organization and Architecture: Chapter 5

Mời các bạn cùng tìm hiểu Semiconductor Memory; Semiconductor Memory Types; Memory Cell Operation;. được trình bày cụ thể trong "Bài giảng Computer Organization and Architecture: Chapter 5 - Internal Memory". | William Stallings Computer Organization and Architecture 6th Edition Chapter 5 Internal Memory Semiconductor Memory Types Semiconductor Memory RAM Misnamed as all semiconductor memory is random access Read/Write Volatile Temporary storage Static or dynamic Memory Cell Operation Dynamic RAM Bits stored as charge in capacitors Charges leak Need refreshing even when powered Simpler construction Smaller per bit Less expensive Need refresh circuits Slower Main memory Essentially analogue Level of charge determines value Dynamic RAM Structure DRAM Operation Address line active when bit read or written Transistor switch closed (current flows) Write Voltage to bit line High for 1 low for 0 Then signal address line Transfers charge to capacitor Read Address line selected transistor turns on Charge from capacitor fed via bit line to sense amplifier Compares with reference value to determine 0 or 1 Capacitor charge must be restored Static RAM Bits stored as on/off switches No .

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