Setting registers using a one-hot signal

Question

I have a set of registers : reg [7:0] dataRegs [3:0] and I have a one-hot signal: reg [3:0] oneHot. I want to write a value to just the register indicated by the one-hot signal. So if oneHot = 4'b0010, that would write to dataRegs[2]. What would be the best way to do that?

So to read from a specific register, I have tri-state buffers as follows:

for (i=0; i<4; i++) begin
  output = oneHot[i]?dataRegs[i]:'bz;
end 

But, I'm not sure how I could use the same oneHot signal to also write to this register. I'm wondering if there is a way to avoid converting oneHot to a binary number just to index into the reg array. Could I do something using a write enable for the registers?

Answer 1

When i=0, write only to reg[0]. When i=1, write only to reg[1], etc.

always @(posedge clk) begin
    for (i=0; i<4; i++) begin
        if (oneHot[i]) dataRegs[i] <= wdata;
    end 
end