Sorgelig wrote:Your understanding is wrong. Auto-refresh is not hidden. HyperRAM has special output signal which shows refresh cycle, so host has to suspend any operations till this signal become inactive again. You cannot control it. You only can wait for it.
It's the same as DDR3 with HW memory controller used on both DE10-nano and Novtech boards. So, you don't need HyperRAM as you already have the similar DRAM with uncontrolled refresh cycles. And this RAM cannot be used in system where precise timings are required.
Sorgelig wrote:Another problem with PSRAM/HyperRAM is max of 128MBit per chip. SDRAM used in MIST/MiSTer is 256MBit. So, for compatibility you need to use 2 chips which will give more troubles. PSRAM is actually DDR requiring diff-clock and much cleaner signals to operate.
Currently, i see more troubles than advantages of these PSRAM chips.
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