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<                     SPEC  = 6'b011100;
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<      reg register_op;
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<           register_op  = ( opcode == SPEC );
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<           else if (register_op) begin
<                ex_alu_op      = 2'b11; // operation defined by func code
<                ex_dst_reg_sel = 1'b1;  // rd dest
<                wb_mem_to_reg  = 1'b0;   // alu_out
<                wb_reg_write   = 1'b1;  // write to rd
<           end