module TxFifoPtrSync #( parameter WIDTH = 8, parameter STAGES = 3 ) ( input ClkFast_i, input ClkSlow_i, input [WIDTH-1:0] TxFifoWrPtr_i, output [WIDTH-1:0] TxFifoWrPtr_o ); //lauch registers reg [WIDTH-1:0] txFifoWrPtrReg; // capture registers (* ASYNC_REG = "TRUE" *) reg [STAGES*WIDTH-1:0] txFifoWrPtrReg_c; assign TxFifoWrPtr_o = txFifoWrPtrReg_c[STAGES*WIDTH-1:(STAGES-1)*WIDTH]; always @(posedge ClkFast_i) begin txFifoWrPtrReg <= TxFifoWrPtr_i; end always @(posedge ClkSlow_i) begin txFifoWrPtrReg_c <= {txFifoWrPtrReg_c[(STAGES-1)*WIDTH-1:0], txFifoWrPtrReg}; end endmodule