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JEDEC Updates Standards for LPDDR3 And LPDDR4

JEDEC Updates Standards for LPDDR3 And LPDDR4

Smartphones Nov 18,2015 0

JEDEC Solid State Technology Association has updated the standards for LPDDR3 And LPDDR4 mobile memory, offering enhanced performance capabilities for mobile computing devices such as smartphones, tablets, and ultra-thin notebooks. JEDEC released the JESD209-4A, Low Power Double Data Rate 4 (LPDDR4) and JESD209-3C Low Power Double Data Rate 3 SDRAM (LPDDR3).

The latest revision adds skew definitions between dies on the channel (rank to rank parameters such as tDQS2DQ_rank2rank and tDQSCK_rank2rank). These definitions address DRAM process variation and allow the SoC to better manage DRAM timing with less complexity. JESD209-4A also adds new eMCP (embedded multi-chip packages) and provides key errata missing from the original standard.

Still widely used in array of mobile products, this latest update to LPDDR3 offers new package configurations:

  • 136-ball PoP (eMMC + LPDDR3)
  • 272-ball dual-Channel POP
  • 221-ball single channel MCP

In addition, lower DRAM densities addressing has been added and a "refresh multiplier" parameter (tREFIM = RM x tREFI) was also introduced.

Tags: jedecLPDDR3LPDDR4
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