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I speculate that the RAM cell shadows the memory contents in two halves and does some internal magic to appear as true dual port.
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That's not possible.
Review "Table 2-9: Memory Configurations for True Dual-Port Mode" in Arria 10 handbook.
It's simply the point that 512x40 configuration isn't supported for true dual port, 1kx20 is however supported. Your design uses two 1kx20 blocks, only 50% utilized. You can increase the memory size to 1kx40 and still need 2 blocks.
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I just wish Altera was more explicit about the cost for using it.
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It's suggested to review the table of available configurations when estimating memory capacity.
Honored Contributor
