fpga: Clean up clocking code

fpga/constraints.pcf

@@ -23,7 +23,7 @@ set_io pmod[7] 31
 
 set_io uart_rx 37
 set_io uart_tx 36
-set_io clk_50m 35
+set_io clk_in 35
 
 #set_io eth_rx_n 38
 set_io eth_rx_p 42

fpga/hdl/design/pll0.vhd

@@ -16,6 +16,7 @@ use generics.ice40_components.all;
 
 entity pll0 is
 	generic(
+		F_IN      : in integer;
 		F_CLK     : in integer;
 		F_CLK_PHY : in integer
 	);
@@ -29,42 +30,23 @@ end pll0;
 
 architecture Structure of pll0 is
 	signal clk_int_osc : std_logic;
+	signal clk_out_i   : std_logic;
 begin
-	SB_HFOSC_inst : component SB_HFOSC
-		generic map(
-			CLKHF_DIV => "0b01"         -- 24 MHz
-		)
-		port map(
-			CLKHFPU => '1',
-			CLKHFEN => '1',
-			CLKHF   => clk_int_osc
-		);
-
-	--	SB_PLL40_PAD_inst : component SB_PLL40_PAD
-	--		generic map(
-	--			FEEDBACK_PATH => "SIMPLE",
-	--			DIVR          => "0000",
-	--			DIVF          => "1000010",
-	--			DIVQ          => "100",
-	--			FILTER_RANGE  => "001"
-	--		)
-	--		port map(
-	--			RESETB     => '1',
-	--			BYPASS     => '0',
-	--			PACKAGEPIN => clk_in,
-	--			PLLOUTCORE => clk_out_phy
-	--		);
-
-	clk_out_phy <= clk_in;
-
 	-- Not clean, but it works...
 	ckdiv2 : process(clk_out_phy) is
 	begin
 		if rising_edge(clk_out_phy) then
-			clk_out <= not clk_out;
+			clk_out_i <= not clk_out_i;
 		end if;
 	end process ckdiv2;
 
+	SB_GB_inst : component SB_GB
+		port map(
+			USER_SIGNAL_TO_GLOBAL_BUFFER => clk_out_i,
+			GLOBAL_BUFFER_OUTPUT         => clk_out
+		);
+
+	assert F_IN = 50000000 report "clk_in: PLL expects clock different from specified." severity failure;
 	assert F_CLK = 25000000 report "clk: PLL generates clock different from specified." severity failure;
 	assert F_CLK_PHY = 50000000 report "clk_phy: PLL generates clock different from specified." severity failure;
 end Structure;

fpga/hdl/design/top.vhd

@@ -20,12 +20,13 @@ use generics.ice40_components.all;
 entity top is
 	generic(
 		-- System configuration
+		F_IN      : integer := 50000000;
 		F_CLK     : integer := 25000000;
 		F_CLK_PHY : integer := 50000000;
 		UART_BAUD : integer := 250000
 	);
 	port(
-		clk_50m          : in    std_logic; -- System clock
+		clk_in           : in    std_logic; -- System clock
 
 		-- UART
 		uart_tx          : out   std_logic; -- UART TX
@@ -173,11 +174,12 @@ begin
 	else generate
 		pll_inst : entity work.pll0
 			generic map(
+				F_IN      => F_IN,
 				F_CLK     => F_CLK,
 				F_CLK_PHY => F_CLK_PHY
 			)
 			port map(
-				clk_in      => clk_50m,
+				clk_in      => clk_in,
 				clk_out     => clk,
 				clk_out_phy => clk_phy,
 				locked      => pll_locked

fpga/hdl/generics/ice40_components.vhd

@@ -14,10 +14,47 @@ package ice40_components is
 			RESETB       : in  std_logic;
 			BYPASS       : in  std_logic;
 			PACKAGEPIN   : in  std_logic;
-			PLLOUTCORE : out std_logic
+			PLLOUTCORE   : out std_logic;
+			PLLOUTGLOBAL : out std_logic
 		);
 	end component SB_PLL40_PAD;
 
+	component SB_PLL40_2_PAD
+		generic(
+			FEEDBACK_PATH : string;
+			DIVR          : std_logic_vector(3 downto 0);
+			DIVF          : std_logic_vector(6 downto 0);
+			DIVQ          : std_logic_vector(2 downto 0);
+			FILTER_RANGE  : std_logic_vector(2 downto 0)
+		);
+		port(
+			RESETB        : in  std_logic;
+			BYPASS        : in  std_logic;
+			PACKAGEPIN    : in  std_logic;
+			PLLOUTCOREA   : out std_logic;
+			PLLOUTCOREB   : out std_logic;
+			PLLOUTGLOBALA : out std_logic;
+			PLLOUTGLOBALB : out std_logic
+		);
+	end component SB_PLL40_2_PAD;
+
+	component SB_PLL40_2_CORE
+		generic(
+			FEEDBACK_PATH : string;
+			DIVR          : std_logic_vector(3 downto 0);
+			DIVF          : std_logic_vector(6 downto 0);
+			DIVQ          : std_logic_vector(2 downto 0);
+			FILTER_RANGE  : std_logic_vector(2 downto 0)
+		);
+		port(
+			RESETB       : in  std_logic;
+			BYPASS       : in  std_logic;
+			REFERENCECLK : in  std_logic;
+			PLLOUTCOREA  : out std_logic;
+			PLLOUTCOREB  : out std_logic
+		);
+	end component SB_PLL40_2_CORE;
+
 	component SB_PLL40_CORE
 		generic(
 			FEEDBACK_PATH : string := "SIMPLE";
@@ -36,7 +73,7 @@ package ice40_components is
 		);
 		port(
 			REFERENCECLK : in  std_logic;
-			--			PLLOUTCORE      : out std_logic;
+			PLLOUTCORE   : out std_logic;
 			PLLOUTGLOBAL : out std_logic;
 			--			EXTFEEDBACK     : in  std_logic;
 			--			DYNAMICDELAY    : in  std_logic_vector(7 downto 0);