digilent/basys3

basys3's Issues

XADCdemo fails timing

After running the tcl script and generating the bitfile, the timing result shows that that there are timing violations related to the digx assignments.

            decimal = decimal * 250000;
            decimal = decimal >> 10;


            dig0 = decimal % 10;
            decimal = decimal / 10;

            dig1 = decimal % 10;
            decimal = decimal / 10;

            dig2 = decimal % 10;
            decimal = decimal / 10;

            dig3 = decimal % 10;
            decimal = decimal / 10;

            dig4 = decimal % 10;
            decimal = decimal / 10;

            dig5 = decimal % 10;
            decimal = decimal / 10; 

            dig6 = decimal % 10;
            decimal = decimal / 10; 

A better approach to this may be to use non-blocking assignments and have dedicated logic for each digit.
Other solution may be to pipeline the assignment process.

Note that I'm using Vivaod 2015.2, so this results may vary for newer versions of Vivado. Also, better timing results are obtained by changing the Syn and PAR directives

Pmod header to device pin mappings INCORRECT

The Pmod headers are commented out but if you do decide to use them, then uncommenting will lead to errors in DRC.

Example: JA[0] incorrectly maps to pin B13. The correct mapping is J1.

NOW FIXED

Need for a readme.

A readme document will enable the users to know what is contained in the repository.