3 use IEEE.std_logic_1164.all;
4 use IEEE.numeric_std.all;
6 use work.common_pkg.all;
9 package extension_uart_pkg is
11 constant EXTWORDL : integer := log2c(4);
12 constant BYTEADDR : integer := log2c(4);
13 constant PCOUNT : integer := 3;
14 constant EXTWORDS : integer := EXTWORDL + BYTEADDR;
16 subtype ext_addrid_t is std_logic_vector(gp_register_t'high - EXTWORDS downto 0);
17 subtype ext_addr_t is std_logic_vector((gp_register_t'high-BYTEADDR) downto 0);
18 subtype paddr_t is std_logic_vector(log2c(PCOUNT)-1 downto 0);
20 type extmod_rec is record
23 byte_en : std_logic_vector(gp_register_t'length/byte_t'length-1 downto 0);
29 type status_rec is record
36 constant EXT_7SEG_ADDR: ext_addrid_t := x"FFFFFFA";
37 constant EXT_EXTMEM_ADDR: ext_addrid_t := x"FFFFFFB";
38 constant EXT_TIMER_ADDR: ext_addrid_t := x"FFFFFFC";
39 constant EXT_AC97_ADDR: ext_addrid_t := x"FFFFFFD";
40 constant EXT_UART_ADDR: ext_addrid_t := x"FFFFFFE";
41 constant EXT_GPMP_ADDR: ext_addrid_t := x"FFFFFFF";
43 constant UART_WIDTH : integer := 8;
44 subtype uart_data is std_logic_vector(UART_WIDTH-1 downto 0);
46 constant CLK_FREQ_MHZ : real := 33.33;
47 constant BAUD_RATE : integer := 115200;
48 constant CLK_PER_BAUD : integer := integer((CLK_FREQ_MHZ * 1000000.0) / real(BAUD_RATE) - 0.5);
50 component extension_uart is
51 --some modules won't need all inputs/outputs
54 RESET_VALUE : std_logic
60 -- general extension interface
61 ext_reg : in extmod_rec;
62 data_out : out gp_register_t;
66 bus_tx : out std_logic
68 end component extension_uart;
74 sys_clk : in std_logic;
75 sys_res_n : in std_logic;
78 bus_tx : out std_logic;
81 new_tx_data : in std_logic;
82 tx_data : in uart_data;
83 tx_rdy : out std_logic
85 end component rs232_tx;
87 end package extension_uart_pkg;