At Computex 2019 this year,Realtek (Realtek) demonstrated thatRTS5261The SD Express solution of the control chip can support a maximum capacity of 128TB and a transmission rate of 1GB/s.Last year, the SD Association issued the SD 7.0 standard. Now,Realtek The chip scheme applicable to SD Express card reader is also given.at presentRTS5261It has been taped, and the actual products based on this scheme are expected to come soon.
According to the SD 7.0 specification, the SD Express memory card must support UHS-I and PCIe 3.0 x1 interface with different pin schemes (UHS-I for SD and UHS-II/III for PCIe).
Therefore, based on the traditional functions of SD, the SD 7.0 control chip also needs to support PCIe features (bus master/DMA, command queue, host memory buffer, etc.), as well as new functions (such as power status) included in NVMe 1.3.
Realtek Means that the company'sRTS5261The chip fully supports all contents required by the SD 7.0 specification, and is connected to the host using the PCIe 3.0 interface.The controller can be used together with SD UC memory card, with a maximum capacity of 128 TB and sequential read and write up to 985 MB/s.
As a comparison, the working prototype of SD Express memory card shown by WD/SanDisk seems to run slightly slower than the theoretical limit of SD 7.0 standard.
But withRTS5261With the popularization of controllers (and passing all necessary consistency tests), it is believed that developers of card readers, laptops and other devices can bring better performance to the next generation of SD cards.