Abstract
DRAM suffers from a growing number of errors from process scaling. System companies and DRAM vendors have introduced system ECC (Error Correcting Codes) and on-die ECC to protect memory from errors. The protection schemes, however, increase protection costs with separate redundancy. This paper proposes a unified memory protection scheme called You Code Only Once (YOCO). In YOCO, the redundancy generated by the system ECC is used for both system-level symbol-error correction and on-die bit-error correction. YOCO can reduce HB <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$M$</tex> 2E ECC redundancy overheads from 21.9% down to 12.5% with negligible yield losses.
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