RAM word lines bit cell bit lines high
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RAM의 기본 구조 word lines bit cell bit lines high (2 bits) sense amplifier low (2 bits) address (4 bits) data (1 bit) 13
메모리 - ROM l OTPROM(One Time Programmable Read-Only Memory) l l Mask ROM, Fuse ROM PROM (Programmable Read-Only Memory) l EPROM(Erasable), EEPROM(Electrically), Flash Memory(Block based I/O) Word Line Floating gate Bit Line Mask ROM Fuse ROM EPROM Bit Line EEPROM Flash Memory 14
캐쉬(Cache) 시스템 CPU 메모리 400 MHz 10 MHz 캐쉬 10 MHz Bus 66 MHz Data object transfer CPU Block transfer 캐쉬 메모리 15
인터럽트 인터페이스 임베디드 시스템의 실시간성 요구에 필수적인 요소 interrupt request 프로세서 interrupt acknowledge data address status reg data reg mechanism l 25
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