# Warning : Input Clock Period Jitter on instance DDRtest_tb.DDRtest_inst.\ddr_sdram_cont_inst/dcm_module_inst/DCM_INST1 exceeds 1.000 ns. Locked CLKIN Period = 20.000. Current CLKIN Period = 10.000.
/////////////////////////////////////////////////////////////////////////////////////
Another form of concatenation is the replication operation. The first expression shall be a non-zero, non-X
and non-Z constant expression, the second expression follows the rules for concatenations. This example
replicates "w" 4 times.
{4{w}} // This is equivalent to {w, w, w, w}
a[31:0] = {1’b1, {0{1’b0}} }; //illegal. RHS becomes {1’b1,;
a[31:0] = {1’b1, {1’bz{1’b0}} }; //illegal. RHS becomes {1’b1,;
a[31:0] = {1’b1, {1’bx{1’b0}} }; //illegal. RHS becomes {1’b1,;
/////////////////////////////////////////////////////////////////////////////////////