The following waveforms show the behavior of altsyncram megafunction for the chosen set of parameters in design sync_rom.vhd . For the purpose of this simulation, the contents of the memory at the start of the sample waveforms is assumed to be ( F0, F1, F2, F3, F4, ...). The design sync_rom.vhd has one read port. The read port has 64 words of 8 bits each. The ram block type of the design is AUTO . The output of the read port is registered by clock.
The above waveform shows the behavior of the design under normal read conditions. The read happens at the rising edge of the enabled clock cycle. The output from the RAM is undefined until after the first rising edge of the read clock.