The Memory of a computing system holds its state information and dominates the chip area. A memory unit (RAM) may contain millions for memory addressable cells. Memory cells are organized into arrays wherein each cell is addressable by a row address and a column address. Memories are the most defect sensitive components as they are fabricated with minimal feature widths. It highly raises the total chip DPM (Defects Per Million) level and thus, calls for high quality tests and repair.
6-transistors SRAM cell
6-transistors SRAM cell
RAM Organization
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