2.4.2. Output Read Data in Simultaneous Read and Write
If you perform a simultaneous read/write to the same address location using the read or write clock mode, the output read data is unknown. If you want the output read data to be a known value, use single-clock or input/output clock mode and then select the appropriate read-during-write behavior in the RAM: 1-PORT and RAM: 2-PORT IP cores.
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