Sample Waveforms for lpm_ram_dq0.v

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Sample behavioral waveforms for design file lpm_ram_dq0.v

The following waveforms show the behavior of altsyncram megafunction for the chosen set of parameters in design lpm_ram_dq0.v. For the purpose of this simulation, the contents of the memory at the start of the sample waveforms is assumed to be ( 3FFF0, 3FFF1, 3FFF2, 3FFF3, ...). The design lpm_ram_dq0.v has one read/write port. The read/write port has 64 words of 18 bits each. The core uses a different clock enable than the input registers. The output of the read/write port is registered by clock.

Fig. 1 : Wave showing read operation.

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. The clock enable on the read side input registers are disabled. The clock enable on the output registers are disabled.

Fig. 2 : Waveform showing write operation

The above waveform shows the behavior of the design under normal write conditions. The write cycle is assumed to be from the rising edge of the enabled clock in which wren is high till the rising edge of the next clock cycle. Actual write into the RAM happens at the rising edge or falling edge of the write clock, depending on whether the RAM blocks are assigned to M-RAM or not. In the sample waveforms, they are shown to be on the falling edge of the write clock. The clock enable on the write side input registers are disabled. The clock enable on the output registers are disabled. During a write cycle, the new data flows through to the output.