Two of these are USB 3.2 solutions, but the really high attention will probably accompany the PSM21-E21T with NVMe.
Phison was looking forward to this year’s CES with SSD controllers in a way worthy of their main profile, and they also brought some interesting developments that are sure to find their place in the market.
First, take a look at the USB 3.2 enhancements labeled PS2251-17 U17 and PS2251-18 U18. The former offers a USB 3.2 Gen2x1, while the latter offers a Gen2x2 host interface, but that’s not the only difference, as the PS2251-17 U17 is a two-channel solution and cannot be built into a TCG OPAL compliant driver. The PS2251-18 U18, on the other hand, already supports a four-channel controller, TCG OPAL, and can be designed for up to 4 TB SSDs, compared to the smaller model’s 1 TB limit, simply because of its more robust design.
Recent enhancements uniformly offer fourth-generation LDPC error correction and do not support DRAM memory. In terms of performance, the supported host interface is highly limiting, so the PS2251-17 U17 is only capable of a sequential read speed of 1 GB / s at a write speed of 0.8 GB / s, but the PS2251- which also handles USB 3.2 Gen2x2 18 The U18 can now display 1.9 and 1.7 GB / s respectively. Properly with NAND flash chips, random read and write speeds performed on 4 kB blocks can typically be between 200-300 MB / s.
Perhaps the market will be a little more interested in the Phison PS5021-E21T, which will try to bring x4 PCI Express 4.0, M.2 2280 format SSDs to a more friendly price level. It does this with support for the NVMe 1.4 protocol, with fourth-generation LDPC error correction.
The PS5021-E21T, like its larger E18 sibling, is built on 12nm manufacturing technology, but has only one ARM Cortex-A5 processor core instead of three, does not support DRAM cache, and the NAND interface has four channels instead of eight, although band performance has improved , to 1600 MT / s. In fact, they all serve to bring out an extremely fast SSD in M.2 2280 format at a lower cost. In return, the data transfer performance will not reach the limits offered by x4 PCI Express 4.0, but the maximum sequential read speed of 5 GB / s specified by Phison still does not sound bad.
Of course, the actual specifications will largely depend on what NAND flash chips are included with the controller. The company was counting on Micron’s 176-cell QLC solutions for which an SSD with a capacity of 0.5-4 TB could be designed with the PS5021-E21T chip. Sequential read speeds can range from 4.5 to 4.8 GB / s, depending on capacity, and from 1.65 to 4.5 GB / s when writing, while random data access is between 250 and 800,000 IOPS. eshet.
USB controllers will be ready sooner and products may arrive in the summer or fall in the fall at the latest. Samples of the Phison PS5021-E21T will only be shipped by the company in the fall, so the actual SSDs may hit stores sometime later this year.
Source: Hírek és cikkek – PROHARDVER! by prohardver.hu.
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