update code style

10 files changed, 244 insertions, 243 deletions

diff --git a/basys3/basys3.srcs/apu.vhd b/basys3/basys3.srcs/apu.vhd
index 4a594ab..1fff1e8 100644
--- a/basys3/basys3.srcs/apu.vhd
+++ b/basys3/basys3.srcs/apu.vhd
@@ -3,29 +3,29 @@ use ieee.std_logic_1164.all;
 --use ieee.numeric_std.all;
 
 entity apu is port(
-	CLK100: in std_logic; -- system clock
-	RESET: in std_logic; -- global (async) system reset
-	DATA: in std_logic_vector(15 downto 0);
-	SOUND: out std_logic);
+	CLK100 : in std_logic; -- system clock
+	RESET : in std_logic; -- global (async) system reset
+	DATA : in std_logic_vector(15 downto 0);
+	SOUND : out std_logic);
 
-	-- EN: in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
-	-- WEN: in std_logic; -- PPU VRAM write enable
-	-- ADDR: in std_logic_vector(15 downto 0); -- PPU VRAM ADDR
-	-- R,G,B: out std_logic_vector(3 downto 0);
-	-- NVSYNC, NHSYNC: out std_logic; -- native VGA out
-	-- TVSYNC, TVBLANK, THSYNC, THBLANK: out std_logic); -- tiny VGA out
+	-- EN : in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
+	-- WEN : in std_logic; -- PPU VRAM write enable
+	-- ADDR : in std_logic_vector(15 downto 0); -- PPU VRAM ADDR
+	-- R,G,B : out std_logic_vector(3 downto 0);
+	-- NVSYNC, NHSYNC : out std_logic; -- native VGA out
+	-- TVSYNC, TVBLANK, THSYNC, THBLANK : out std_logic); -- tiny VGA out
 end apu;
 
 architecture Behavioral of apu is
 	component apu_note_to_frequency port(
-		data: in std_logic_vector(7 downto 0);
-		freq: out std_logic_vector(7 downto 0)); --frequency
+		data : in std_logic_vector(7 downto 0);
+		freq : out std_logic_vector(7 downto 0)); --frequency
 	end component;
 	component apu_LUT_reader port(
-		clk: in std_logic;
-		rst: in std_logic;
-		wave: in std_logic_vector(1 downto 0);
-		level: out std_logic_vector(7 downto 0));
+		clk : in std_logic;
+		rst : in std_logic;
+		wave : in std_logic_vector(1 downto 0);
+		level : out std_logic_vector(7 downto 0));
 	end component;
 begin
 
diff --git a/basys3/basys3.srcs/apu_note_to_frequency.vhd b/basys3/basys3.srcs/apu_note_to_frequency.vhd
index 7e02c75..1e47b8e 100644
--- a/basys3/basys3.srcs/apu_note_to_frequency.vhd
+++ b/basys3/basys3.srcs/apu_note_to_frequency.vhd
@@ -10,9 +10,9 @@ entity apu_note_to_frequency is port (
 end entity;
 
 architecture Behavioral of apu_note_to_frequency is
-	signal buff_small: std_logic_vector(7 downto 0) := (others => '0');
-	signal buff: std_logic_vector(15 downto 0) := (others => '0');
-	signal shift: integer;
+	signal buff_small : std_logic_vector(7 downto 0) := (others => '0');
+	signal buff : std_logic_vector(15 downto 0) := (others => '0');
+	signal shift : integer;
 begin
 	shift <= to_integer(unsigned(data(2 downto 0)));
 	buff_small <= 
diff --git a/basys3/basys3.srcs/apu_note_to_frequency_tb.vhd b/basys3/basys3.srcs/apu_note_to_frequency_tb.vhd
index 6814c1f..f48a40c 100644
--- a/basys3/basys3.srcs/apu_note_to_frequency_tb.vhd
+++ b/basys3/basys3.srcs/apu_note_to_frequency_tb.vhd
@@ -10,20 +10,20 @@ end entity;
 
 architecture Behavioral of apu_note_to_frequency_tb is
 	component apu_note_to_frequency is port(
-		data: in std_logic_vector(7 downto 0);
-		freq: out std_logic_vector(11 downto 0)); -- frequency
+		data : in std_logic_vector(7 downto 0);
+		freq : out std_logic_vector(11 downto 0)); -- frequency
 	end component;
 
-	signal data: std_logic_vector(7 downto 0) := (others => '0');
-	signal freq: std_logic_vector(11 downto 0) := (others => '0');
+	signal data : std_logic_vector(7 downto 0) := (others => '0');
+	signal freq : std_logic_vector(11 downto 0) := (others => '0');
 
-	signal ok: boolean := false;
+	signal ok : boolean := false;
 begin
-	uut: apu_note_to_frequency port map(
+	uut : apu_note_to_frequency port map(
 		data => data,
 		freq => freq);
 	
-	tb: process
+	tb : process
 	begin
 		for i in 0 to 255 loop
 			data <= std_logic_vector(to_unsigned(i, 8));
diff --git a/basys3/basys3.srcs/ppu.vhd b/basys3/basys3.srcs/ppu.vhd
index 663f3ab..acf546f 100644
--- a/basys3/basys3.srcs/ppu.vhd
+++ b/basys3/basys3.srcs/ppu.vhd
@@ -6,184 +6,184 @@ use ieee.std_logic_1164.all;
 use work.ppu_consts.all;
 
 entity ppu is port(
-	CLK100: in std_logic; -- system clock
-	RESET: in std_logic; -- global (async) system reset
-	EN: in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
-	WEN: in std_logic; -- PPU VRAM write enable
-	ADDR: in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- PPU VRAM ADDR
-	DATA: in std_logic_vector(PPU_RAM_BUS_DATA_WIDTH-1 downto 0);
-	R,G,B: out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0);
-	NVSYNC, NHSYNC: out std_logic; -- native VGA out
-	TVSYNC, TVBLANK, THSYNC, THBLANK: out std_logic); -- tiny VGA out
+	CLK100 : in std_logic; -- system clock
+	RESET : in std_logic; -- global (async) system reset
+	EN : in std_logic; -- PPU VRAM enable (enable ADDR and DATA tri-state drivers)
+	WEN : in std_logic; -- PPU VRAM write enable
+	ADDR : in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- PPU VRAM ADDR
+	DATA : in std_logic_vector(PPU_RAM_BUS_DATA_WIDTH-1 downto 0);
+	R,G,B : out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0);
+	NVSYNC, NHSYNC : out std_logic; -- native VGA out
+	TVSYNC, TVBLANK, THSYNC, THBLANK : out std_logic); -- tiny VGA out
 end ppu;
 
 architecture Behavioral of ppu is
 	component ppu_pceg port( -- pipeline clock edge generator
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic; -- async reset
-		SPRITE: out std_logic; -- sprite info fetch + sprite pixel fetch
-		COMP_PAL: out std_logic; -- compositor + palette lookup
-		DONE: out std_logic); -- last pipeline stage done
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic; -- async reset
+		SPRITE : out std_logic; -- sprite info fetch + sprite pixel fetch
+		COMP_PAL : out std_logic; -- compositor + palette lookup
+		DONE : out std_logic); -- last pipeline stage done
 	end component;
 	component ppu_addr_dec port( -- pipeline clock edge generator
-		WEN: in std_logic; -- EXT write enable
+		WEN : in std_logic; -- EXT write enable
 		TMM_WEN,
 		BAM_WEN,
 		FAM_WEN,
 		PAL_WEN,
-		AUX_WEN: out std_logic; -- write enable MUX
-		EN: in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
-		ADDR: in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
-		TMM_AI: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		BAM_AI: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		FAM_AI: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-		PAL_AI: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-		AUX_AI: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
-		TMM_AO: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		BAM_AO: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		FAM_AO: out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-		PAL_AO: out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-		AUX_AO: out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
+		AUX_WEN : out std_logic; -- write enable MUX
+		EN : in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
+		ADDR : in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
+		TMM_AI : in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		BAM_AI : in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		FAM_AI : in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+		PAL_AI : in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+		AUX_AI : in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+		TMM_AO : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		BAM_AO : out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		FAM_AO : out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+		PAL_AO : out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+		AUX_AO : out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
 	end component;
 	component ppu_bam port( -- BAM block memory
-		clka: in std_logic;
-		rsta: in std_logic;
-		wea: in std_logic_vector(0 downto 0);
-		addra: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		dina: in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
-		douta: out std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
-		rsta_busy: out std_logic);
+		clka : in std_logic;
+		rsta : in std_logic;
+		wea : in std_logic_vector(0 downto 0);
+		addra : in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		dina : in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
+		douta : out std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
+		rsta_busy : out std_logic);
 	end component;
 	component ppu_tmm port( -- TMM block memory
-		clka: in std_logic;
-		rsta: in std_logic;
-		wea: in std_logic_vector(0 downto 0);
-		addra: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		dina: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
-		douta: out std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
-		rsta_busy: out std_logic);
+		clka : in std_logic;
+		rsta : in std_logic;
+		wea : in std_logic_vector(0 downto 0);
+		addra : in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		dina : in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
+		douta : out std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
+		rsta_busy : out std_logic);
 	end component;
 	component ppu_aux port(
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic; -- reset memory
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic; -- reset memory
 
 		-- internal memory block (AUX)
-		AUX_WEN: in std_logic; -- VRAM AUX write enable
-		AUX_ADDR: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0); -- VRAM AUX address
-		AUX_DATA: in std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0); -- VRAM AUX data
+		AUX_WEN : in std_logic; -- VRAM AUX write enable
+		AUX_ADDR : in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0); -- VRAM AUX address
+		AUX_DATA : in std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0); -- VRAM AUX data
 		
 		-- aux outputs
-		BG_SHIFT_X: out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
-		BG_SHIFT_Y: out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
-		FG_FETCH: out std_logic);
+		BG_SHIFT_X : out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
+		BG_SHIFT_Y : out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
+		FG_FETCH : out std_logic);
 	end component;
 	component ppu_sprite_bg port( -- background sprite
 		-- inputs
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic; -- reset clock counter
-		OE: in std_logic; -- output enable (of CIDX)
-		X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
-		Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic; -- reset clock counter
+		OE : in std_logic; -- output enable (of CIDX)
+		X : in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+		Y : in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
 		
 		-- aux inputs
-		BG_SHIFT_X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
-		BG_SHIFT_Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
+		BG_SHIFT_X : in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
+		BG_SHIFT_Y : in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
 
 		-- used memory blocks
-		BAM_ADDR: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		BAM_DATA: in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
-		TMM_ADDR: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		TMM_DATA: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
+		BAM_ADDR : out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		BAM_DATA : in std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
+		TMM_ADDR : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		TMM_DATA : in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
 
 		-- outputs
-		CIDX: out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0)); -- output color
+		CIDX : out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0)); -- output color
 	end component;
 	component ppu_sprite_fg port( -- foreground sprite
 		-- inputs
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic; -- reset internal memory and clock counters
-		OE: in std_logic; -- output enable (of CIDX)
-		X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
-		Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
-		FETCH: in std_logic; -- fetch sprite data from TMM (TODO: generic map, set foreground sprite component index)
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic; -- reset internal memory and clock counters
+		OE : in std_logic; -- output enable (of CIDX)
+		X : in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+		Y : in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+		FETCH : in std_logic; -- fetch sprite data from TMM (TODO : generic map, set foreground sprite component index)
 
 		-- internal memory block (FAM)
-		FAM_WEN: in std_logic; -- VRAM FAM write enable
-		FAM_ADDR: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0); -- VRAM fam address
-		FAM_DATA: in std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0); -- VRAM fam data
+		FAM_WEN : in std_logic; -- VRAM FAM write enable
+		FAM_ADDR : in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0); -- VRAM fam address
+		FAM_DATA : in std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0); -- VRAM fam data
 
 		-- used memory blocks
-		TMM_ADDR: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		TMM_DATA: in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
+		TMM_ADDR : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		TMM_DATA : in std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
 
 		-- outputs
-		CIDX: out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- output color
-		HIT: out std_logic); -- current pixel is not transparent
+		CIDX : out std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- output color
+		HIT : out std_logic); -- current pixel is not transparent
 	end component;
 	component ppu_comp port( -- compositor
-		FG_HIT: in std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
-		BG_EN: out std_logic;
-		FG_EN: out std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0));
+		FG_HIT : in std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
+		BG_EN : out std_logic;
+		FG_EN : out std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0));
 	end component;
 	component ppu_plut port( -- palette lookup table
-		CLK: in std_logic; -- system clock
-		CIDX: in std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- color in
-		RESET: in std_logic;
+		CLK : in std_logic; -- system clock
+		CIDX : in std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0); -- color in
+		RESET : in std_logic;
 
 		-- internal memory block (AUX)
-		PAL_WEN: in std_logic; -- VRAM PAL write enable
-		PAL_ADDR: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0); -- VRAM PAL address
-		PAL_DATA: in std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0); -- VRAM PAL data
+		PAL_WEN : in std_logic; -- VRAM PAL write enable
+		PAL_ADDR : in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0); -- VRAM PAL address
+		PAL_DATA : in std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0); -- VRAM PAL data
 		
-		R,G,B: out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0)); -- VGA color out
+		R,G,B : out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0)); -- VGA color out
 	end component;
 	component ppu_vga_tiny port( -- tiny vga signal generator
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic;
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic;
 
-		X: out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
-		Y: out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+		X : out std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+		Y : out std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
 		
 		VSYNC, VBLANK,
-		HSYNC, HBLANK: out std_logic); -- VGA sync outputs
+		HSYNC, HBLANK : out std_logic); -- VGA sync outputs
 	end component;
 	component ppu_vga_native port( -- native vga signal generator (upscaler)
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic;
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic;
 
-		X: in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
-		Y: in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
-		PREADY: in std_logic; -- current pixel ready (pixel color is stable)
-		RI,GI,BI: in std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color in
+		X : in std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+		Y : in std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+		PREADY : in std_logic; -- current pixel ready (pixel color is stable)
+		RI,GI,BI : in std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color in
 		
-		RO,GO,BO: out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color out
-		VSYNC, HSYNC: out std_logic); -- VGA sync outputs
+		RO,GO,BO : out std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- VGA color out
+		VSYNC, HSYNC : out std_logic); -- VGA sync outputs
 	end component;
 
 	-- signals
-	signal SYSCLK, SYSRST: std_logic; -- system clock and reset
-	signal PL_SPRITE, PL_COMP_PAL, PL_DONE: std_logic; -- pipeline stages
-	signal TMM_WEN, BAM_WEN, FAM_WEN, PAL_WEN, AUX_WEN: std_logic;
-	signal TMM_AI, TMM_AO: std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-	signal BAM_AI, BAM_AO: std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-	signal FAM_AI, FAM_AO: std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-	signal PAL_AI, PAL_AO: std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-	signal AUX_AI, AUX_AO: std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
-	signal TMM_DO: std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
-	signal BAM_DO: std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
-	signal FAM_DO: std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0);
-	signal PAL_DO: std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0);
-	signal AUX_DO: std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0);
-	signal CIDX: std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0);
-	signal BG_EN: std_logic;
-	signal FG_EN, FG_HIT: std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
-	signal X: std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
-	signal Y: std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
-	signal UR,UG,UB: std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- unstable RGB (to be buffered)
-	signal SR,SG,SB: std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- stable RGB (buffered until PL_COMP_PAL)
-	signal BG_SHIFT_X: std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
-	signal BG_SHIFT_Y: std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
-	signal FG_FETCH: std_logic;
+	signal SYSCLK, SYSRST : std_logic; -- system clock and reset
+	signal PL_SPRITE, PL_COMP_PAL, PL_DONE : std_logic; -- pipeline stages
+	signal TMM_WEN, BAM_WEN, FAM_WEN, PAL_WEN, AUX_WEN : std_logic;
+	signal TMM_AI, TMM_AO : std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+	signal BAM_AI, BAM_AO : std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+	signal FAM_AI, FAM_AO : std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+	signal PAL_AI, PAL_AO : std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+	signal AUX_AI, AUX_AO : std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+	signal TMM_DO : std_logic_vector(PPU_TMM_DATA_WIDTH-1 downto 0);
+	signal BAM_DO : std_logic_vector(PPU_BAM_DATA_WIDTH-1 downto 0);
+	signal FAM_DO : std_logic_vector(PPU_FAM_DATA_WIDTH-1 downto 0);
+	signal PAL_DO : std_logic_vector(PPU_PAL_DATA_WIDTH-1 downto 0);
+	signal AUX_DO : std_logic_vector(PPU_AUX_DATA_WIDTH-1 downto 0);
+	signal CIDX : std_logic_vector(PPU_PALETTE_CIDX_WIDTH-1 downto 0);
+	signal BG_EN : std_logic;
+	signal FG_EN, FG_HIT : std_logic_vector(PPU_FG_SPRITE_COUNT-1 downto 0);
+	signal X : std_logic_vector(PPU_POS_H_WIDTH-1 downto 0); -- current screen pixel x
+	signal Y : std_logic_vector(PPU_POS_V_WIDTH-1 downto 0); -- current screen pixel y
+	signal UR,UG,UB : std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- unstable RGB (to be buffered)
+	signal SR,SG,SB : std_logic_vector(PPU_COLOR_OUTPUT_DEPTH-1 downto 0); -- stable RGB (buffered until PL_COMP_PAL)
+	signal BG_SHIFT_X : std_logic_vector(PPU_POS_H_WIDTH-1 downto 0);
+	signal BG_SHIFT_Y : std_logic_vector(PPU_POS_V_WIDTH-1 downto 0);
+	signal FG_FETCH : std_logic;
 begin
 	SYSCLK <= CLK100;
 	SYSRST <= RESET;
@@ -197,14 +197,14 @@ begin
 	FAM_AI <= (others => '0');
 	PAL_AI <= (others => '0');
 
-	pipeline_clock_edge_generator: component ppu_pceg port map(
+	pipeline_clock_edge_generator : component ppu_pceg port map(
 		CLK => SYSCLK,
 		RESET => SYSRST,
 		SPRITE => PL_SPRITE,
 		COMP_PAL => PL_COMP_PAL,
 		DONE => PL_DONE);
 
-	address_decoder: component ppu_addr_dec port map(
+	address_decoder : component ppu_addr_dec port map(
 		EN => EN,
 		WEN => WEN,
 		ADDR => ADDR,
@@ -224,7 +224,7 @@ begin
 		PAL_WEN => PAL_WEN,
 		AUX_WEN => AUX_WEN);
 
-	background_attribute_memory: component ppu_bam port map(
+	background_attribute_memory : component ppu_bam port map(
 		clka => SYSCLK,
 		rsta => SYSRST,
 		wea => (others => BAM_WEN),
@@ -232,7 +232,7 @@ begin
 		dina => DATA(PPU_BAM_DATA_WIDTH-1 downto 0),
 		douta => BAM_DO,
 		rsta_busy => open);
-	tilemap_memory: component ppu_tmm port map(
+	tilemap_memory : component ppu_tmm port map(
 		clka => SYSCLK,
 		rsta => SYSRST,
 		wea => (others => TMM_WEN),
@@ -241,7 +241,7 @@ begin
 		douta => TMM_DO,
 		rsta_busy => open);
 
-	aux: component ppu_aux port map(
+	aux : component ppu_aux port map(
 		CLK => SYSCLK,
 		RESET => SYSRST,
 		AUX_WEN => AUX_WEN,
@@ -251,7 +251,7 @@ begin
 		BG_SHIFT_Y => BG_SHIFT_Y,
 		FG_FETCH => FG_FETCH);
 
-	background_sprite: component ppu_sprite_bg port map(
+	background_sprite : component ppu_sprite_bg port map(
 		CLK => PL_SPRITE,
 		RESET => SYSRST,
 		OE => BG_EN,
@@ -265,8 +265,8 @@ begin
 		TMM_DATA => TMM_DO,
 		CIDX => CIDX);
 
-	foreground_sprites: for FG_IDX in 0 to PPU_FG_SPRITE_COUNT-1 generate
-		foreground_sprite: component ppu_sprite_fg port map(
+	foreground_sprites : for FG_IDX in 0 to PPU_FG_SPRITE_COUNT-1 generate
+		foreground_sprite : component ppu_sprite_fg port map(
 			CLK => PL_SPRITE,
 			RESET => SYSRST,
 			OE => FG_EN(FG_IDX),
@@ -282,12 +282,12 @@ begin
 			HIT => FG_HIT(FG_IDX));
 	end generate;
 
-	compositor: component ppu_comp port map( -- compositor
+	compositor : component ppu_comp port map( -- compositor
 		FG_HIT => FG_HIT,
 		BG_EN => BG_EN,
 		FG_EN => FG_EN);
 
-	palette_lookup: component ppu_plut port map( -- palette lookup table
+	palette_lookup : component ppu_plut port map( -- palette lookup table
 		CLK => SYSCLK,
 		CIDX => CIDX,
 		RESET => SYSRST,
@@ -312,7 +312,7 @@ begin
 		end if;
 	end process;
 
-	tiny_vga_signal_generator: component ppu_vga_tiny port map( -- tiny vga signal generator
+	tiny_vga_signal_generator : component ppu_vga_tiny port map( -- tiny vga signal generator
 		CLK => SYSCLK,
 		RESET => SYSRST,
 		X => X,
@@ -322,7 +322,7 @@ begin
 		HSYNC => THSYNC,
 		HBLANK => THBLANK);
 
-	native_vga_signal_generator: component ppu_vga_native port map( -- native vga signal generator (upscaler)
+	native_vga_signal_generator : component ppu_vga_native port map( -- native vga signal generator (upscaler)
 		CLK => SYSCLK,
 		RESET => SYSRST,
 		X => X,
diff --git a/basys3/basys3.srcs/ppu_addr_dec.vhd b/basys3/basys3.srcs/ppu_addr_dec.vhd
index 28c22fc..df83964 100644
--- a/basys3/basys3.srcs/ppu_addr_dec.vhd
+++ b/basys3/basys3.srcs/ppu_addr_dec.vhd
@@ -5,28 +5,28 @@ use ieee.std_logic_1164.all;
 use work.ppu_consts.all;
 
 entity ppu_addr_dec is port(
-	EN: in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
-	WEN: in std_logic; -- EXT write enable
+	EN : in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
+	WEN : in std_logic; -- EXT write enable
 	TMM_WEN,
 	BAM_WEN,
 	FAM_WEN,
 	PAL_WEN,
-	AUX_WEN: out std_logic; -- write enable MUX
-	ADDR: in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
-	TMM_AI: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-	BAM_AI: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-	FAM_AI: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-	PAL_AI: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-	AUX_AI: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
-	TMM_AO: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-	BAM_AO: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-	FAM_AO: out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-	PAL_AO: out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-	AUX_AO: out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
+	AUX_WEN : out std_logic; -- write enable MUX
+	ADDR : in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
+	TMM_AI : in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+	BAM_AI : in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+	FAM_AI : in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+	PAL_AI : in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+	AUX_AI : in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+	TMM_AO : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+	BAM_AO : out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+	FAM_AO : out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+	PAL_AO : out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+	AUX_AO : out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
 end ppu_addr_dec;
 
 architecture Behavioral of ppu_addr_dec is
-	signal TMM_RANGE, BAM_RANGE, FAM_RANGE, PAL_RANGE, AUX_RANGE: std_logic := '0'; -- ADDR in range of memory area
+	signal TMM_RANGE, BAM_RANGE, FAM_RANGE, PAL_RANGE, AUX_RANGE : std_logic := '0'; -- ADDR in range of memory area
 begin
 	-- address MUX
 	TMM_AO <= ADDR(PPU_TMM_ADDR_WIDTH-1 downto 0) when EN = '1' else TMM_AI;
diff --git a/basys3/basys3.srcs/ppu_addr_dec_tb.vhd b/basys3/basys3.srcs/ppu_addr_dec_tb.vhd
index 5c7119d..f31ee67 100644
--- a/basys3/basys3.srcs/ppu_addr_dec_tb.vhd
+++ b/basys3/basys3.srcs/ppu_addr_dec_tb.vhd
@@ -12,41 +12,41 @@ end ppu_addr_dec_tb;
 
 architecture behavioral of ppu_addr_dec_tb is
 	component ppu_addr_dec port(
-		EN: in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
-		WEN: in std_logic; -- EXT write enable
+		EN : in std_logic; -- EXT *ADDR enable (switch *AO to ADDR instead of *AI)
+		WEN : in std_logic; -- EXT write enable
 		TMM_WEN,
 		BAM_WEN,
 		FAM_WEN,
 		PAL_WEN,
-		AUX_WEN: out std_logic; -- write enable MUX
-		ADDR: in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
-		TMM_AI: in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		BAM_AI: in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		FAM_AI: in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-		PAL_AI: in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-		AUX_AI: in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
-		TMM_AO: out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-		BAM_AO: out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-		FAM_AO: out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-		PAL_AO: out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-		AUX_AO: out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
+		AUX_WEN : out std_logic; -- write enable MUX
+		ADDR : in std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0); -- address in
+		TMM_AI : in std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		BAM_AI : in std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		FAM_AI : in std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+		PAL_AI : in std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+		AUX_AI : in std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+		TMM_AO : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+		BAM_AO : out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+		FAM_AO : out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+		PAL_AO : out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+		AUX_AO : out std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0));
 	end component;
-	signal EN: std_logic;
-	signal WEN: std_logic;
-	signal TMM_WEN, BAM_WEN, FAM_WEN, PAL_WEN, AUX_WEN: std_logic;
-	signal ADDR: std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0);
-	signal TMM_AI: std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-	signal BAM_AI: std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-	signal FAM_AI: std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-	signal PAL_AI: std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-	signal AUX_AI: std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
-	signal TMM_AO: std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
-	signal BAM_AO: std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
-	signal FAM_AO: std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
-	signal PAL_AO: std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
-	signal AUX_AO: std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+	signal EN : std_logic;
+	signal WEN : std_logic;
+	signal TMM_WEN, BAM_WEN, FAM_WEN, PAL_WEN, AUX_WEN : std_logic;
+	signal ADDR : std_logic_vector(PPU_RAM_BUS_ADDR_WIDTH-1 downto 0);
+	signal TMM_AI : std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+	signal BAM_AI : std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+	signal FAM_AI : std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+	signal PAL_AI : std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+	signal AUX_AI : std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
+	signal TMM_AO : std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0);
+	signal BAM_AO : std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0);
+	signal FAM_AO : std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0);
+	signal PAL_AO : std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0);
+	signal AUX_AO : std_logic_vector(PPU_AUX_ADDR_WIDTH-1 downto 0);
 begin
-	uut: ppu_addr_dec port map(
+	uut : ppu_addr_dec port map(
     EN => EN,
     WEN => WEN,
     TMM_WEN => TMM_WEN,
@@ -75,7 +75,7 @@ begin
   PAL_AI <= (others => '0');
   AUX_AI <= (others => '0');
 
-	tb: process
+	tb : process
 	begin
 		for i in 0 to 65535 loop
       ADDR <= std_logic_vector(to_unsigned(i,16));
diff --git a/basys3/basys3.srcs/ppu_consts.vhd b/basys3/basys3.srcs/ppu_consts.vhd
index c063586..3e7d46d 100644
--- a/basys3/basys3.srcs/ppu_consts.vhd
+++ b/basys3/basys3.srcs/ppu_consts.vhd
@@ -1,22 +1,22 @@
 package ppu_consts is
-	constant PPU_RAM_BUS_ADDR_WIDTH: natural := 16; -- RAM bus address width
-	constant PPU_RAM_BUS_DATA_WIDTH: natural := 16; -- RAM bus data width
-	constant PPU_FG_SPRITE_COUNT: natural := 128; -- amount of foreground sprites
-	constant PPU_COLOR_OUTPUT_DEPTH: natural := 4; -- VGA output channel depth
-	constant PPU_PALETTE_IDX_WIDTH: natural := 3; -- palette index width (within sprite)
-	constant PPU_PALETTE_WIDTH: natural := 3; -- palette index width (palette table)
-	constant PPU_PALETTE_CIDX_WIDTH: natural := PPU_PALETTE_IDX_WIDTH + PPU_PALETTE_WIDTH; -- global palette index width
-	constant PPU_TMM_ADDR_WIDTH: natural := 16;
-	constant PPU_TMM_DATA_WIDTH: natural := 16;
-	constant PPU_BAM_ADDR_WIDTH: natural := 11;
-	constant PPU_BAM_DATA_WIDTH: natural := 15;
-	constant PPU_FAM_ADDR_WIDTH: natural := 8;
-	constant PPU_FAM_DATA_WIDTH: natural := 16;
-	constant PPU_PAL_ADDR_WIDTH: natural := 6;
-	constant PPU_PAL_DATA_WIDTH: natural := 12;
-	constant PPU_AUX_ADDR_WIDTH: natural := 2;
-	constant PPU_AUX_DATA_WIDTH: natural := 16;
-	constant PPU_POS_H_WIDTH: natural := 9; -- amount of bits for horizontal screen offset
-	constant PPU_POS_V_WIDTH: natural := 8; -- amount of bits for vertical screen offset
+	constant PPU_RAM_BUS_ADDR_WIDTH : natural := 16; -- RAM bus address width
+	constant PPU_RAM_BUS_DATA_WIDTH : natural := 16; -- RAM bus data width
+	constant PPU_FG_SPRITE_COUNT : natural := 128; -- amount of foreground sprites
+	constant PPU_COLOR_OUTPUT_DEPTH : natural := 4; -- VGA output channel depth
+	constant PPU_PALETTE_IDX_WIDTH : natural := 3; -- palette index width (within sprite)
+	constant PPU_PALETTE_WIDTH : natural := 3; -- palette index width (palette table)
+	constant PPU_PALETTE_CIDX_WIDTH : natural := PPU_PALETTE_IDX_WIDTH + PPU_PALETTE_WIDTH; -- global palette index width
+	constant PPU_TMM_ADDR_WIDTH : natural := 16;
+	constant PPU_TMM_DATA_WIDTH : natural := 16;
+	constant PPU_BAM_ADDR_WIDTH : natural := 11;
+	constant PPU_BAM_DATA_WIDTH : natural := 15;
+	constant PPU_FAM_ADDR_WIDTH : natural := 8;
+	constant PPU_FAM_DATA_WIDTH : natural := 16;
+	constant PPU_PAL_ADDR_WIDTH : natural := 6;
+	constant PPU_PAL_DATA_WIDTH : natural := 12;
+	constant PPU_AUX_ADDR_WIDTH : natural := 2;
+	constant PPU_AUX_DATA_WIDTH : natural := 16;
+	constant PPU_POS_H_WIDTH : natural := 9; -- amount of bits for horizontal screen offset
+	constant PPU_POS_V_WIDTH : natural := 8; -- amount of bits for vertical screen offset
 end package ppu_consts;
 
diff --git a/basys3/basys3.srcs/ppu_pceg.vhd b/basys3/basys3.srcs/ppu_pceg.vhd
index 9675e5b..1aaeee4 100644
--- a/basys3/basys3.srcs/ppu_pceg.vhd
+++ b/basys3/basys3.srcs/ppu_pceg.vhd
@@ -3,18 +3,18 @@ use ieee.std_logic_1164.all;
 --use ieee.numeric_std.all;
 
 entity ppu_pceg is port(
-	CLK: in std_logic; -- system clock
-	RESET: in std_logic; -- async reset
-	SPRITE: out std_logic; -- sprite info fetch + sprite pixel fetch
-	COMP_PAL: out std_logic; -- compositor + palette lookup
-	DONE: out std_logic); -- last pipeline stage done
+	CLK : in std_logic; -- system clock
+	RESET : in std_logic; -- async reset
+	SPRITE : out std_logic; -- sprite info fetch + sprite pixel fetch
+	COMP_PAL : out std_logic; -- compositor + palette lookup
+	DONE : out std_logic); -- last pipeline stage done
 end ppu_pceg;
 
 architecture Behavioral of ppu_pceg is
-	constant PPU_PL_TOTAL_STAGES: natural := 14;
+	constant PPU_PL_TOTAL_STAGES : natural := 14;
 
 	type states is (PL_SPRITE, PL_COMP_PAL, PL_DONE);
-	signal state: states := PL_SPRITE;
+	signal state : states := PL_SPRITE;
 begin
 	-- output drivers
 	SPRITE <= CLK when RESET = '0' and state = PL_SPRITE else '0';
@@ -22,7 +22,7 @@ begin
 	DONE <= '1' when RESET = '0' and state = PL_DONE else '0';
 
 	process(CLK, RESET)
-		variable CLK_IDX: natural range 0 to PPU_PL_TOTAL_STAGES+1 := 0;
+		variable CLK_IDX : natural range 0 to PPU_PL_TOTAL_STAGES+1 := 0;
 	begin
 		if RESET = '1' then
 			state <= PL_SPRITE;
diff --git a/basys3/basys3.srcs/ppu_pceg_tb.vhd b/basys3/basys3.srcs/ppu_pceg_tb.vhd
index 137d4b4..719ec06 100644
--- a/basys3/basys3.srcs/ppu_pceg_tb.vhd
+++ b/basys3/basys3.srcs/ppu_pceg_tb.vhd
@@ -10,27 +10,27 @@ end ppu_pceg_tb;
 
 architecture behavioral of ppu_pceg_tb is
 	component ppu_pceg port(
-		CLK: in std_logic; -- system clock
-		RESET: in std_logic; -- async reset
-		SPRITE: out std_logic; -- sprite info fetch + sprite pixel fetch
-		COMP_PAL: out std_logic; -- compositor + palette lookup
-		DONE: out std_logic); -- last pipeline stage done
+		CLK : in std_logic; -- system clock
+		RESET : in std_logic; -- async reset
+		SPRITE : out std_logic; -- sprite info fetch + sprite pixel fetch
+		COMP_PAL : out std_logic; -- compositor + palette lookup
+		DONE : out std_logic); -- last pipeline stage done
 	end component;
-	signal CLK: std_logic := '0';
-	signal RESET: std_logic := '0';
-	signal SPRITE: std_logic;
-	signal COMP_PAL: std_logic;
-	signal DONE: std_logic;
+	signal CLK : std_logic := '0';
+	signal RESET : std_logic := '0';
+	signal SPRITE : std_logic;
+	signal COMP_PAL : std_logic;
+	signal DONE : std_logic;
 
 begin
-	uut: ppu_pceg port map(
+	uut : ppu_pceg port map(
 		CLK => CLK,
 		RESET => RESET,
 		SPRITE => SPRITE,
 		COMP_PAL => COMP_PAL,
 		DONE => DONE);
 
-	tb: process
+	tb : process
 	begin
 		for i in 0 to 32 loop
 			if i > 20 then
diff --git a/style.md b/style.md
index 3cbe9b8..4a65ed3 100644
--- a/style.md
+++ b/style.md
@@ -51,4 +51,5 @@ before formatting as a failsafe.
 - testbench name is the component name with `_tb` as suffix
 - vhdl filename is the same as the component name
 - vhdl files should end in the `.vhd` file extension, not `.vhdl`
+- use spaces around the colon used for setting the type of signal definitions