Warning: Cannot meet tRTP requirement of 7.5 ns. For a Memory interface clock frequency of 133.0 MHz, the minimum is 8.2 ns. Click "Modify Parameters" to change the requirement or adjust the Memory interface clock frequency.

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Warning: Cannot meet tRTP requirement of 7.5 ns. For a Memory interface clock frequency of 133.0 MHz, the minimum is 8.2 ns. Click "Modify Parameters" to change the requirement or adjust the Memory interface clock frequency.

Timing constraints/analysis

<Warning message>
Warning: Cannot meet tRTP requirement of 7.5 ns. For a Memory interface clock frequency of 133.0 MHz, the minimum is 8.2 ns. Click "Modify Parameters" to change the requirement or adjust the Memory interface clock frequency.

The conditions under which this warning message occurs are as follows.

Device: EP4CGX150DF27I7
Quartus II v13.0
Memory Controller: DDR2/SDRAM HPC2 16bit
PHY: ALTMEMPHY

As a countermeasure, ignore the ALTMEMPHY Warning Message and refer to the following formula to determine tRTP.

Substitute tRTP = 7.5ns into the following formula and apply the tRTP that satisfies the conditional formula.
tRTP/(2 × tCK) > 1 : tRTP=7.5ns
tRTP/(2 × tCK) ? 1 : tRTP=AL + BL/2

For details, please refer to the calculation formula written in the data sheet of the memory.

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