Added CPLD-based synchronization

This is a proof of concept and it's still very crude
For more info read (http://spcomnav.uab.es/docs/conferences/Bartolucci_NAVITEC_2016.pdf)

firmware/cpld/sgpio_if/README.md

@@ -1,6 +1,18 @@
 CPLD interface between LPC43xx microcontroller SGPIO peripheral and MAX5864
 RF codec.
 
+CPLD-based triggered capture
+============================
+
+Code related to the paper:
+
+[M. Bartolucci, J. A. del Peral-Rosado, R. Estatuet-Castillo, J. A. Garcia-Molina, M. Crisci, G. E. Corazza, "Synchronisation of low-cost open source SDRs for navigation applications", Proc. 8th ESA Workshop on Satellite Navigation User Equipment Technologies (NAVITEC), Dec 16 2016](http://spcomnav.uab.es/docs/conferences/Bartolucci_NAVITEC_2016.pdf)
+
+Please read the paper for hardware correction and additional details.
+
+* If you don't want to build use `code]default_sync.xsvf` to flash the CPLD
+* This is still a very rough implementation. Synchronization can't be disabled!
+
 Requirements
 ============
 

firmware/cpld/sgpio_if/top.jed

@@ -1,5 +1,5 @@
 Programmer Jedec Bit Map
-Date Extracted: Wed Aug 20 08:36:47 2014
+Date Extracted: Fri Jul  8 16:10:08 2016
 
 QF25812*
 QP100*
@@ -375,14 +375,14 @@ L012944 1111111111111111*
 L012960 1111111010110111*
 L012976 1111111011010111*
 L012992 1110101011111111*
-L013008 1100111011111111*
+L013008 0110111011111111*
 L013024 1110101011111111*
 L013040 1111111010110111*
 L013056 1110101011111111*
 L013072 1111111010110111*
 L013088 1111111010110111*
 L013104 1111111111111111*
-L013120 1111111010110111*
+L013120 1100111011111111*
 L013136 1111111011010111*
 L013152 1111111111111111*
 L013168 1111111111111111*
@@ -395,7 +395,7 @@ L013264 1111111011010111*
 L013280 1111111011010111*
 L013296 1111111111111111*
 L013312 1111111111111111*
-L013328 1111111111111111*
+L013328 1111111010110111*
 L013344 1111111111111111*
 L013360 1111111111111111*
 L013376 1111111111111111*
@@ -410,15 +410,15 @@ L013504 1111111111111111*
 L013520 1111111111111111*
 
 Note Block 2 PLA AND array *
-L013536 11110111110111111111111111111111111111111111111111111111111111111011111111111111*
+L013536 11110111110111011111111111111111111111111111111111111111111111111011111111111111*
-L013616 11011011111001110111111111111111111111111111111111111111111111111011111111111111*
+L013616 11011011111001010111111111111111111111111111111111111111111111111011111111111111*
-L013696 11110111111011011111111111111111111111111111111111111111111111111111111111111111*
+L013696 11110111111011111111111111110111111111111111111111111111111111111111111111111111*
-L013776 11111011110111011111111111111111111111111111111111111111111111111111111111111111*
+L013776 11111011110111111111111111110111111111111111111111111111111111111111111111111111*
 L013856 11111111111111111101011111111111111111111111111111111111111111111111111111111111*
 L013936 11111111111111111110101111111111111111111111111111111111111111111111111111111111*
-L014016 11111111111111111111011111110111111111111111111111111111111111111111111111111111*
+L014016 11111111111111111111011111111111111111111111111111111101111111111111111111111111*
 L014096 11111111111011111111111111111111111111111111111111111111111111111111111111111111*
-L014176 11111111111111111111101111111011111111111111111111111111111111111111111111111111*
+L014176 11111111111111111111101111111111111111111111111111111110111111111111111111111111*
 L014256 11111111011111111111011111111111111111111111111111111111111111111111111111111111*
 L014336 11111111101111111111101111111111111111111111111111111111111111111111111111111111*
 L014416 11111111111111111111011101111111111111111111111111111111111111111111111111111111*
@@ -552,8 +552,8 @@ L019376 1111111111111111*
 L019392 1111111111111111*
 L019408 1111111111111111*
 L019424 1111111111111111*
-L019440 1111111111111111*
+L019440 1111111011100111*
-L019456 1111111111111111*
+L019456 1111111010110111*
 L019472 1111111111111111*
 L019488 1111111111111111*
 L019504 1111111111111111*
@@ -592,8 +592,8 @@ L019984 111111111111111111111111111111111111111111111111111111111111111111111111
 L020064 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L020144 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L020224 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
-L020304 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
+L020304 11111111111111011111111111111111111111111111111111111111111111111111111111111111*
-L020384 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
+L020384 11111111111101111111111111111111111111111111111111111111111111111111111111111111*
 L020464 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L020544 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L020624 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
@@ -637,7 +637,7 @@ L023584 111111111111111111111111111111111111111111111111111111111111111111111111
 L023664 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L023744 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L023824 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
-L023904 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
+L023904 11111111111110111111111111111111111111111111111111111111111111111111111111111111*
 L023984 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L024064 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
 L024144 11111111111111111111111111111111111111111111111111111111111111111111111111111111*
@@ -717,8 +717,8 @@ L025576 000001111001111110011111100*
 L025603 000001111001111110011111100*
 L025630 000001111001111110011111100*
 L025657 000001111001111110011111100*
-L025684 000001111001111110011111100*
+L025684 101101011000010000011111101*
-L025711 000001111001111110011111100*
+L025711 000001111001111101010000011*
 L025738 000001111001111110011111100*
 L025765 000001111001111110011111100*
 
@@ -753,5 +753,5 @@ L025810 0*
 Note I/O Bank 1 Vcco *
 L025811 0*
 
-CFB93*
+CF7BB*
-AA7A
+AA74

firmware/cpld/sgpio_if/top.ucf

@@ -18,51 +18,57 @@
 # the Free Software Foundation, Inc., 51 Franklin Street,
 # Boston, MA 02110-1301, USA.
 
-NET "CODEC_CLK"    LOC="23" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "CODEC_X2_CLK" LOC="27" |IOSTANDARD=LVCMOS33;
-
 NET "CODEC_X2_CLK" TNM_NET = CODEC_X2_CLK;
 TIMESPEC TS_codec_x2_data = PERIOD "CODEC_X2_CLK" 25 ns;
 
-NET "DA<7>" LOC="35" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<6>" LOC="36" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<5>" LOC="37" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<4>" LOC="39" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<3>" LOC="40" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<2>" LOC="41" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<1>" LOC="42" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-NET "DA<0>" LOC="43" |IOSTANDARD=LVCMOS33 | TNM=adc_data;
-
-NET "DD<9>" LOC="17" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<8>" LOC="18" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<7>" LOC="19" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<6>" LOC="24" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<5>" LOC="28" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<4>" LOC="29" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<3>" LOC="30" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<2>" LOC="32" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<1>" LOC="33" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-NET "DD<0>" LOC="34" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=dac_data;
-
-NET "HOST_DIRECTION" LOC="71" |IOSTANDARD=LVCMOS33 | SLEW=SLOW;
-NET "HOST_DISABLE"   LOC="76" |IOSTANDARD=LVCMOS33 | SLEW=SLOW;
-NET "HOST_CAPTURE"   LOC="91" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<7>"   LOC="77" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<6>"   LOC="61" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<5>"   LOC="64" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<4>"   LOC="67" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<3>"   LOC="72" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<2>"   LOC="74" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<1>"   LOC="79" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-NET "HOST_DATA<0>"   LOC="89" |IOSTANDARD=LVCMOS33 | SLEW=SLOW | TNM=to_host;
-
-NET "HOST_DECIM_SEL<2>"		LOC="78" |IOSTANDARD=LVCMOS33;
-NET "HOST_DECIM_SEL<1>"		LOC="81" |IOSTANDARD=LVCMOS33;
-NET "HOST_DECIM_SEL<0>"		LOC="90" |IOSTANDARD=LVCMOS33;
-NET "HOST_Q_INVERT"			LOC="70" |IOSTANDARD=LVCMOS33;
-
 TIMEGRP "adc_data" OFFSET = IN 16 ns BEFORE "CODEC_X2_CLK";
 
 TIMEGRP "dac_data" OFFSET = OUT 15 ns AFTER "CODEC_X2_CLK";
 
 TIMEGRP "to_host" OFFSET = OUT 20 ns AFTER "CODEC_X2_CLK";
+#PACE: Start of Constraints generated by PACE
+
+#PACE: Start of PACE I/O Pin Assignments
+NET "CODEC_CLK"  LOC = "P23" | IOSTANDARD = LVCMOS33 ; 
+NET "CODEC_X2_CLK"  LOC = "P27" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<0>"  LOC = "P43" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<1>"  LOC = "P42" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<2>"  LOC = "P41" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<3>"  LOC = "P40" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<4>"  LOC = "P39" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<5>"  LOC = "P37" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<6>"  LOC = "P36" | IOSTANDARD = LVCMOS33 ; 
+NET "DA<7>"  LOC = "P35" | IOSTANDARD = LVCMOS33 ; 
+NET "DD<0>"  LOC = "P34" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<1>"  LOC = "P33" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<2>"  LOC = "P32" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<3>"  LOC = "P30" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<4>"  LOC = "P29" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<5>"  LOC = "P28" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<6>"  LOC = "P24" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<7>"  LOC = "P19" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<8>"  LOC = "P18" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "DD<9>"  LOC = "P17" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_CAPTURE"  LOC = "P91" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<0>"  LOC = "P89" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<1>"  LOC = "P79" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<2>"  LOC = "P74" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<3>"  LOC = "P72" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<4>"  LOC = "P67" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<5>"  LOC = "P64" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<6>"  LOC = "P61" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DATA<7>"  LOC = "P77" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+NET "HOST_DECIM_SEL<0>"  LOC = "P90" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_DECIM_SEL<1>"  LOC = "P81" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_DECIM_SEL<2>"  LOC = "P78" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_DIRECTION"  LOC = "P71" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_DISABLE"  LOC = "P76" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_Q_INVERT"  LOC = "P70" | IOSTANDARD = LVCMOS33 ; 
+NET "HOST_SYNC"  LOC = "P55" | IOSTANDARD = LVCMOS33; 
+NET "HOST_SYNC_CMD"  LOC = "P56" | IOSTANDARD = LVCMOS33  | SLEW = SLOW ; 
+
+#PACE: Start of PACE Area Constraints
+
+#PACE: Start of PACE Prohibit Constraints
+
+#PACE: End of Constraints generated by PACE

firmware/cpld/sgpio_if/top.vhd

@@ -30,6 +30,8 @@ entity top is
     Port(
         HOST_DATA       : inout std_logic_vector(7 downto 0);
         HOST_CAPTURE    : out   std_logic;
+		HOST_SYNC_CMD	: out	  std_logic;
+		HOST_SYNC			: in	  std_logic;
         HOST_DISABLE    : in    std_logic;
         HOST_DIRECTION  : in    std_logic;
         HOST_DECIM_SEL  : in    std_logic_vector(2 downto 0);
@@ -56,6 +58,9 @@ architecture Behavioral of top is
 
     signal host_data_enable_i : std_logic;
     signal host_data_capture_o : std_logic;
+	signal host_sync_o : std_logic := '0';
+	signal host_sync_i : std_logic := '0';
+	signal host_sync_latched : std_logic := '0';
 
     signal data_from_host_i : std_logic_vector(7 downto 0);
     signal data_to_host_o : std_logic_vector(7 downto 0);
@@ -95,6 +100,9 @@ begin
     data_from_host_i <= HOST_DATA;
 
     HOST_CAPTURE <= host_data_capture_o;
+	host_sync_i <= HOST_SYNC;
+	HOST_SYNC_CMD <= host_sync_o;
+	 
     host_data_enable_i <= not HOST_DISABLE;
     transfer_direction_i <= to_dac when HOST_DIRECTION = '1'
                                    else from_adc;
@@ -149,18 +157,30 @@ begin
             end if;
         end if;
     end process;
+	 
+	process (host_data_enable_i, host_sync_i)
+	begin
+		host_sync_o <= host_data_enable_i;
+		if host_data_enable_i = '1' then
+			if rising_edge(host_sync_i) then
+				host_sync_latched <= host_sync_i;
+			end if;
+		else
+			host_sync_latched <= '0';
+		end if;
+	end process;
     
     process(host_clk_i)
     begin
         if rising_edge(host_clk_i) then
             if transfer_direction_i = to_dac then
                 if codec_clk_i = '1' then
-                    host_data_capture_o <= host_data_enable_i;
+                    host_data_capture_o <= host_data_enable_i and host_sync_latched;
                 end if;
             else
-                if codec_clk_i = '0' then
+					if codec_clk_i = '0' then
-                    host_data_capture_o <= host_data_enable_i and decimate_en;
+						host_data_capture_o <= host_data_enable_i and decimate_en and host_sync_latched;
-                end if;
+					end if; 
             end if;
         end if;
     end process;