DRAM and DRAM-Less Support
Yes a controller can run with or without DRAM, the OP simply wants to know if his SSD has DRAM cache.IIUC, Phison's PS311-S11/S11T flash controllers incorporate an SDRAM controller. The SDRAM is external. The PS3111-S11T can run in either DRAM or DRAM-less mode, according to Phison's press release.
Phison's block diagram shows Mask ROM, Data SRAM and Programmable SRAM. That's static RAM, not SDRAM. You don't need a controller to access SRAM.The S11 does indeed have embedded SDRAM (DRAM), 32MB in capacity. However, according to its manual (M.2 variant) this is used as a write cache rather than for metadata (pp. 4-5, or 12-13/36). It should be considered DRAM-less for all practical purposes. As fzabkar states above, it has a DRAM controller (it has to for the embedded amount), so technically could support external DRAM, but never does.
You can absolutely have DRAM on-package, but I agree there's clearly no external chip here. Although many products state 32MB of SDR. However from the S11 documents (I linked one above) it states this is utilized for write caching, so the point is moot.You can physically see the lack of a dram chip, so no dram.
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