ModelSim + for loop generation + nonresolved signal has multiple sources error

Altera_Forum · ‎12-03-2012

Hello All,

I am trying to compile the following code in modelsim and getting "nonresolved signal RX_CH_A has multiple sources.


-- In process 1
            for i in 0 to 5 loop
                RX_CH_A(11 - 2*i) <= PA(6 - i);
                RX_CH_B(11 - 2*i) <= PB(6 - i);
                RX_CH_C(11 - 2*i) <= PC(6 - i);
                RX_CH_D(11 - 2*i) <= PD(6 - i);
            end loop;
-- In process 2
            for i in 0 to 5 loop
                RX_CH_A(10 - 2*i) <= NA(6 - i);
                RX_CH_B(10 - 2*i) <= NB(6 - i);
                RX_CH_C(10 - 2*i) <= NC(6 - i);
                RX_CH_D(10 - 2*i) <= ND(6 - i);
            end loop;

Since process1 uses odd bits and process2 uses even bits, there should not be a "multiple source" error.

Quartus compiles and synthesises the code just fine.

Only modelsim reports this error.

Any help / pointers would be appreciated.

Ram

Altera_Forum · ‎12-03-2012

--- Quote Start ---

Hello All,

I am trying to compile the following code in modelsim and getting "nonresolved signal RX_CH_A has multiple sources.


-- In process 1
            for i in 0 to 5 loop
                RX_CH_A(11 - 2*i) <= PA(6 - i);
                RX_CH_B(11 - 2*i) <= PB(6 - i);
                RX_CH_C(11 - 2*i) <= PC(6 - i);
                RX_CH_D(11 - 2*i) <= PD(6 - i);
            end loop;
-- In process 2
            for i in 0 to 5 loop
                RX_CH_A(10 - 2*i) <= NA(6 - i);
                RX_CH_B(10 - 2*i) <= NB(6 - i);
                RX_CH_C(10 - 2*i) <= NC(6 - i);
                RX_CH_D(10 - 2*i) <= ND(6 - i);
            end loop;

Since process1 uses odd bits and process2 uses even bits, there should not be a "multiple source" error.

Quartus compiles and synthesises the code just fine.

Only modelsim reports this error.

Any help / pointers would be appreciated.

Ram

--- Quote End ---

try put them in one process. Should have same functionality.

Altera_Forum · ‎12-03-2012

--- Quote Start ---

try put them in one process. Should have same functionality.

--- Quote End ---

Hi Kaz,

Thanks for quick reply.

I am clocking in the odd bits at rising edge and the even bits at falling edge. That was why I separated them in different processes.

regards.

Ram