FORESEE NCEFAT28-08G – NAND or eMMC? Discover here the true about this efSD memory


I have read some comments about Foresee NCEFAT28-08G memory. Some said it is a NAND Flash, others said it is an eMMC memory. None of them are true (or not at all).

I just got NCEFAT28-08G Datasheet and I could confirm that this is an hybrid memory called efSD memory with eMMC 4.51 specification compatibility.

FORESEE efSD is an embedded storage solution designed in the BGA package. The FORESEE efSD consists of NAND flash and eMMC controller. The controller could manage the interface protocols, wear-leveling, bad block management and ECC. FORESEE efSD has high performance at a competitive cost, high quality and low power consumption, and efSD is compatible with JEDEC standard eMMC 4.51 specifications.

FORESEE diagram
FORESEE diagram


  • eMMC4.51 specification compatibility (Backward compatible to eMMC4.41)

Bus mode:

  • Data bus width: 1 bit (default), 4 bits, 8 bits
  • Data transfer rate: up to 104MB/s (High Speed DDR)
  • MMC I/F Clock frequency : 0~52MHz

Operating voltage range:

  • Vcc(NAND) : 2.7 – 3.6V
  • Vccq(Controller) : 1.7 – 1.95V / 2.7 – 3.6V


  • Operation (-25 ℃ ~ +85℃)
  • Storage without operation (-40 ℃ ~ +85℃)


  • Compliance with the RoHS  directive

Preventing from Sudden-Power-Off

Hardware ECC engine

Unique firmware backup mechanism


Supported features:

  • High Speed DDR, up to DDR mode at 52MHz
  • Partitioning, RPMB
  • Boot feature, boot partition
  • HW Reset/SW Reset
  • Discard, Trim, Erase, Sanitize
  • Background operations, HPI
  • Enhanced reliable write
  • Sleep / awake

We probably should call these memories “eMMC” anyway, as they are using same package and controller.

You can contact Shenzhen Longsys Electronics Co.Ltd and look at their products from their website: FORESEE eMMC Memory

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