Memory Basics Chapter 8.

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Presentation transcript:

Memory Basics Chapter 8

Memory definitions RAM Random access memory ROM Read-only memory

RAM

Control inputs to a memory chip

Properties of memory Static RAM (SRAM) Dynamic RAM (DRAM) Consists of internal latches that store the binary information Dynamic RAM (DRAM) Stores the binary information in the form of electric charges on capacitors

若Bit select為1，則接通1, 2 gates。 𝑊𝑟𝑖𝑡𝑒 為1，寫入資料，3, 4接通。Data in之後產生B, 𝐵 ，再選word，選到的5,6,7,8接通，此時不是Set就是Reset，傳入C或 𝐶 。在Read logic S, R其一為1，經2輸出。

Three-state buffer IN EN OUT EN IN OUT X Hi-Z 1 16-word by 1-bit RAM chip

16x1 RAM using a 4x4 RAM cell array Reduce number of Decoder gates Inputs per gate RAM cells per slice

8x2 RAM using a 4x4 RAM cell array

Example A 32K x 8 RAM 32K x 8=215*23=218 Each column 29 9-29 decoder 6-26 decoder

64K x 8 RAM

256K x 8 RAM

64K x 16 RAM