In order for the SD 7.0/7.1 (aka SD Express) ecosystem to take off, a number of things are needed, but aside from specification itself, availability of controllers for card readers as well as controllers for cards is crucial. Apparently, Phison had already developed its first controller for SD Express and microSD cards and even showcased prototypes of such cards at Computex. Phison’s PS5017 controller is compliant with the SD 7.1 specification, so it can be used both for SD Express and microSD Express cards. The chip supports various types of 3D TLC and 3D QLC NAND memory featuring ONFI or Toggle 2.0 interfaces, but total capacity is limited to 512 GB for some reason. Performance wise, the controller promises up to 900 MB/s sequential read...

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