The SD Affiliation plans to formally announce its Safe Digital 7.zero specification later this month. The brand new spec will outline utilization of a PCIe protocol for SD playing cards and can due to this fact considerably enhance efficiency in comparison with present playing cards that use the united statesI or UHS-II buses.
Earlier this 12 months Western Digital demonstrated a prototype SD card that includes a PCIe three.zero x1 interface, whereas the SD Affiliation introduced plans to standardize utilization of PCI Categorical on SD playing cards. Because it seems, SDA is accelerating its PCIe with SD effort and can formally announce publication of the spec at this 12 months’s MWC Shanghai that takes place on June 26 – June 28.
Particulars concerning the spec are unknown at this level. In the meantime Western Digital’s implementation demonstrated at MWC used the prevailing UHS-II/III pins to assemble a PCIe three.zero x1 interface with the host and possibly commonplace PCIe voltage with a converter. The cardboard provided 880 MB/s sequential learn speeds in addition to as much as 430 MB/s sequential write speeds, in keeping with the CrystalDiskMark benchmark, which is significantly increased in comparison with playing cards that includes the united statesII bus (as much as 312 MB/s full duplex), and about 40% increased when in comparison with playing cards that includes the united statesIII bus (as much as 624 MB/s full duplex).
Utilization of a PCIe protocol will resolve a lot of performance-related challenges for the SD commonplace generally however will create new ones too. Firstly, it should allow SD playing cards to extend their efficiency and can guarantee a gentle and simple path for efficiency upgrades sooner or later. Secondly, it should simplify implementation of high-performance SD card readers on PCs and related gadgets that run chips that already assist PCIe. In concept, PCIe may allow the SD know-how to transcend playing cards and into highly-integrated storage modules (like eMMC, UFS, and many others.) for numerous functions. Nevertheless, there shall be challenges too: PCIe shouldn’t be precisely energy environment friendly (this may change with PCIe four.zero although), PCIe shouldn’t be supported by most smartphone/digicam SoCs due to energy and another components. Furthermore, the SDA desires PCIe-based SD playing cards (and possibly hosts) to be backward suitable, which suggests extra problems.
In any case, the aforementioned are simply theoretical results a PCIe interface may carry to the SD world. The formal announcement is simply weeks away, so we’ll study all the knowledge shortly from now.
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