Basic Problems with altlvds_rx ipcore on CycloneV

There are some mysteries in this problem.

In the megawizard the rx clk is set to 300MHz (period of 3.333 as megawizard shows).

If we now set rx_clk period in sdc as:

3.330 warning

3.331

3.332

3.333

3.335

3.336 warning

we get warning message if it is 3.330 or 3.336 but not others(i.e. sdc/wizard discrepancy of +/-.002 is not reported).

The warning implies that TQ is aware that rx clk is actually entered as 3.333

yet if we set sdc to 3.333 we get this funny violations which disappear on other values.

On a separate issue: The original post's setup of data rate of 500Mbps and rx clk of 250MHz does not show any problem. Yet the reduced example given in a later post was set to data rate of 600Mbps and rx clk of 300MHz whih showed the problem on sdc entery of 3.333.