R EG P LANE 0P LANE 1P LANE 2P LANE 3 D IE 0 R EG P LANE 0P LANE 1P LANE 2P LANE 3 D IE 1 R EG Data Register4 KB Page Size4 KB Block Size256 KB Plane512 MB Die Size2 GB Erase Cycles100K Page Read25μs Page Program200μs Serial Access100μs Block Erase1.5ms MLC (multiple bits in cell): slower, less durable ’09? 20μs

P P0P0 Block(P) P P1P1

PQ P0P0 Q0Q0 Page(P) Page(Q) P P1P1

PQR Q0Q0 Page(R) Page(P) P P0P0 R0R0 P0P0 Q R Q0Q0 R0R0

R EG D IE 0 R EG D IE 1 R EG

Controller

R EG D IE 0 R EG D IE 1 R EG

Shared-bus gang Shared-control gang

With faster serial connect, intra- chip ops are less important

P0P0 Q0Q0 R0R0 QR Q0Q0 R0R0 Q R Block A Cold content If Remaining(A) < Migrate-Threshold, clean A, but migrate cold data into A If Remaining(A) < Throttle-Threshold, reduce probability of cleaning A Expiry Meter for block A P Block B If Remaining(A) >= Migrate-Threshold, clean A

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