From 0fa4de71db978ac5bb0ab239218bd6c32558c502 Mon Sep 17 00:00:00 2001
From: Martin Prudek <prudemar@fel.cvut.cz>
Date: Fri, 27 Mar 2015 12:21:26 +0100
Subject: [PATCH 1/1] qcounter doplnen komentari

---
 pmsm-control/qcounter.vhdl | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/pmsm-control/qcounter.vhdl b/pmsm-control/qcounter.vhdl
index c8e8d77..f1378dc 100644
--- a/pmsm-control/qcounter.vhdl
+++ b/pmsm-control/qcounter.vhdl
@@ -31,6 +31,8 @@ architecture behavioral of qcounter is
 		:= "000000000000000000000000000000";
 	signal count: std_logic_vector (29 downto 0);
 begin
+	--ustaleni signalu a mezi tiky hodin
+	--reaguje na nabeznou hranu
 	dff_a: dff
 	port map (
 		clock => clock,
@@ -38,6 +40,8 @@ begin
 		q => a
 	);
 	
+	--ustaleni signalu b mezi tiky hodin
+	--reaguje na nabeznou hranu
 	dff_b: dff
 	port map (
 		clock => clock,
@@ -45,11 +49,13 @@ begin
 		q => b
 	);
   
+	--prvni dva rady kombinacne
 	qcount(0) <= a xor b;
 	qcount(1) <= b;
 	qcount(31 downto 2) <= count;
   
-	comb_event: process (a_prev, b_prev, a, b)
+	--k cemu tento prosess? jen pro prenos udalosti na piny?
+	comb_event: process (a_prev, b_prev, a, b) --proc je v sensitivity listu i stary stav?? jen kvuli nulovani?
 	begin
 		a_rise <= '0';
 		a_fall <= '0';
@@ -57,29 +63,32 @@ begin
 		b_fall <= '0';
 		ab_event <= '0';
 		ab_error <= '0';
-		if ((a xor a_prev) and (b xor b_prev)) = '1' then
+		if ((a xor a_prev) and (b xor b_prev)) = '1' then -- a i b se zmenily zaroven
 			-- forbidden double transition
 			ab_error <= '1';
 		else
-			a_rise <= (a xor a_prev) and a;
-			a_fall <= (a xor a_prev) and not a;
-			b_rise <= (b xor b_prev) and b;
-			b_fall <= (b xor b_prev) and not b;
-			ab_event <= (a xor a_prev) or (b xor b_prev);
+			a_rise <= (a xor a_prev) and a; --a nabezna
+			a_fall <= (a xor a_prev) and not a; --a sestupna
+			b_rise <= (b xor b_prev) and b; --b nabezna
+			b_fall <= (b xor b_prev) and not b; --b sestupna
+			ab_event <= (a xor a_prev) or (b xor b_prev); --a nebo b se zmenily
 		end if;
 	end process;
 
-	comb_count: process (a_prev, b_prev, a, b, count)
+	--prechod do 3. radu (binarne)
+	comb_count: process (a_prev, b_prev, a, b, count) --proc jsou v sensitivity prev stavy?
 	begin
-		if (a_prev = '0') and (b_prev = '1') and (a = '0') and (b = '0') then
+		if (a_prev = '0') and (b_prev = '1') and (a = '0') and (b = '0') then --posun dopredu 
 			count <= count_prev + 1;
-		elsif (a_prev = '0') and (b_prev = '0') and (a = '0') and (b = '1') then
+		elsif (a_prev = '0') and (b_prev = '0') and (a = '0') and (b = '1') then --posun dozadu
 			count <= count_prev - 1;
 		else
 			count <= count_prev;
 		end if;
 	end process;
 
+	--s nabeznou hranou hodin ulozime stare (prev) hodnoty, pripadne synchronni reset
+	--proc resuteje count_prev misto count?? neprojevi se tato zmena az pri pruchodu comb_count??
 	seq: process
 	begin
 		wait until clock'event and clock = '1';
@@ -93,3 +102,5 @@ begin
 	end process;
 	
 end behavioral;
+--Poznamky
+	--proc pouzivan count_prev a neprirazuji rovnou do count?
-- 
2.39.2