diff options
Diffstat (limited to 'basys3/basys3.srcs/ppu_addr_dec.vhd')
| -rw-r--r-- | basys3/basys3.srcs/ppu_addr_dec.vhd | 28 |
1 files changed, 11 insertions, 17 deletions
diff --git a/basys3/basys3.srcs/ppu_addr_dec.vhd b/basys3/basys3.srcs/ppu_addr_dec.vhd index e0c374f..33f247c 100644 --- a/basys3/basys3.srcs/ppu_addr_dec.vhd +++ b/basys3/basys3.srcs/ppu_addr_dec.vhd @@ -4,8 +4,7 @@ use ieee.std_logic_1164.all; --use ieee.numeric_std.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) +entity ppu_addr_dec is port( -- address decoder WEN : in std_logic; -- EXT write enable TMM_WEN, BAM_WEN, @@ -13,27 +12,22 @@ entity ppu_addr_dec is port( 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)); + TMM_ADDR : out std_logic_vector(PPU_TMM_ADDR_WIDTH-1 downto 0); + BAM_ADDR : out std_logic_vector(PPU_BAM_ADDR_WIDTH-1 downto 0); + FAM_ADDR : out std_logic_vector(PPU_FAM_ADDR_WIDTH-1 downto 0); + PAL_ADDR : out std_logic_vector(PPU_PAL_ADDR_WIDTH-1 downto 0); + AUX_ADDR : 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 begin -- address MUX - TMM_AO <= ADDR(PPU_TMM_ADDR_WIDTH-1 downto 0) when EN = '1' else TMM_AI; - BAM_AO <= ADDR(PPU_BAM_ADDR_WIDTH-1 downto 0) when EN = '1' else BAM_AI; - FAM_AO <= ADDR(PPU_FAM_ADDR_WIDTH-1 downto 0) when EN = '1' else FAM_AI; - PAL_AO <= ADDR(PPU_PAL_ADDR_WIDTH-1 downto 0) when EN = '1' else PAL_AI; - AUX_AO <= ADDR(PPU_AUX_ADDR_WIDTH-1 downto 0) when EN = '1' else AUX_AI; + TMM_ADDR <= ADDR(PPU_TMM_ADDR_WIDTH-1 downto 0); + BAM_ADDR <= ADDR(PPU_BAM_ADDR_WIDTH-1 downto 0); + FAM_ADDR <= ADDR(PPU_FAM_ADDR_WIDTH-1 downto 0); + PAL_ADDR <= ADDR(PPU_PAL_ADDR_WIDTH-1 downto 0); + AUX_ADDR <= ADDR(PPU_AUX_ADDR_WIDTH-1 downto 0); -- WEN MUX TMM_WEN <= TMM_RANGE and WEN; |