library IEEE;

use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;

use work.common_pkg.all;


package extension_pkg is

constant EXTWORDL : integer := log2c(4);
constant BYTEADDR : integer := log2c(4);
constant PCOUNT   : integer := log2c(4);
constant EXTWORDS : integer := EXTWORDL + BYTEADDR;

subtype ext_addrid_t  is std_logic_vector(gp_register_t'high - EXTWORDS downto 0);
subtype ext_addr_t    is std_logic_vector((gp_register_t'high-BYTEADDR) downto 0);    
subtype pointer_count is std_logic_vector(PCOUNT-1 downto 0);   

        type extmod_rec is record
                sel   : std_logic;
                wr_en : std_logic;
                byte_en : std_logic_vector(gp_register_t'length/byte_t'length-1 downto 0); 
                data : gp_register_t;
                addr : ext_addr_t;     
        end record; 




constant EXT_7SEG_ADDR:   ext_addrid_t := x"FFFFFFA";
constant EXT_EXTMEM_ADDR: ext_addrid_t := x"FFFFFFB";
constant EXT_TIMER_ADDR:  ext_addrid_t := x"FFFFFFC";
constant EXT_AC97_ADDR:   ext_addrid_t := x"FFFFFFD";
constant EXT_UART_ADDR:   ext_addrid_t := x"FFFFFFE";
constant EXT_GPM_ADDR:    ext_addrid_t := x"FFFFFFF";





end package extension_pkg;