diff --git a/lib/emac/src/piso.vhd b/lib/emac/src/piso.vhd
index 51152fa..037ff3f 100644
--- a/lib/emac/src/piso.vhd
+++ b/lib/emac/src/piso.vhd
@@ -88,8 +88,10 @@ begin
 	if rising_edge(clk) then
 		if rst = '1' then
 			shift_cnt_pipe	<= (others => '1');
+		elsif (din_vld = '1' and din_vld_reg = '0') then
+			shift_cnt_pipe	<= (others => '0');
 		elsif dout_en = '1' then
-			if (pre_fin = '1' and din_vld_reg = '1') or (din_vld = '1' and din_vld_reg = '0') then
+			if (pre_fin = '1' and din_vld_reg = '1') then
 				shift_cnt_pipe	<= (others => '0');
 			else
 				shift_cnt_pipe	<= shift_cnt_pipe(shift_cnt_pipe'left-1 downto 0)  & '1';