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reg [63:0]A;

reg [1023:0]SaveA_1;

reg [3:0] counter=0;

SaveA_1[(counter+1)*64-1:counter*64]<=A[63:0];

想用counter变量来指定寄存器的位置，结果显示错误如下：

[Synth 8-1002] counter is not a constant ["D:/vivadoworkspace/project_2/project_2.srcs/sources_1/new/matri16.v":88]

该怎么办？