diff --git a/lib/filter/src/delay_line.vhd b/lib/filter/src/delay_line.vhd
index 890a93f..45edf19 100644
--- a/lib/filter/src/delay_line.vhd
+++ b/lib/filter/src/delay_line.vhd
@@ -65,10 +65,12 @@ shift_register:
 	process(clk)
 	variable delay_pipe	: delay_pipe_t;
 	begin
-		if rising_edge(clk) and ce = '1' then
-			dout			<= delay_pipe(delay);
-			if shift_en = '1' then
-				delay_pipe		:= delay_pipe(delay_pipe'left-1 downto 0) & din;
+		if rising_edge(clk) then
+			if ce = '1' then
+				dout			<= delay_pipe(delay);
+				if shift_en = '1' then
+					delay_pipe		:= delay_pipe(delay_pipe'left-1 downto 0) & din;
+				end if;
 			end if;
 		end if;
 	end process;
diff --git a/lib/filter/src/tb_fir_semi_parallel.vhd b/lib/filter/src/tb_fir_semi_parallel.vhd
index 95d7cf6..810168f 100644
--- a/lib/filter/src/tb_fir_semi_parallel.vhd
+++ b/lib/filter/src/tb_fir_semi_parallel.vhd
@@ -134,8 +134,6 @@ BEGIN
 		wait for PERIOD/2;
 	END PROCESS;
 
---	din_vld <= rdy;
-
 	tb : PROCESS
 	file fi : file_t open read_mode is "wav_in.dat";
 	variable si : sample_t;