EclaireXL

GENERIC

(

low_memory : integer := 0 -- if 0, we assume 8MB SDRAM, if 1, we assume 1MB 'SDRAM'.

);

gen_normal_memory : if low_memory=0 generate

end generate;

gen_low_memory : if low_memory=1 generate

-- SRAM memory map (512k)

-- base 64k RAM - banks 0-3 "000 0000 1111 1111 1111 1111" (TOP)

-- to 512k RAM - banks 4-31 "000 0111 1111 1111 1111 1111" (TOP)

-- SDRAM memory map (8MB)

-- base 64k RAM - banks 0-3 "000 0000 1111 1111 1111 1111" (TOP)

-- to 512k RAM - banks 4-31 "000 0111 1111 1111 1111 1111" (TOP)

-- to 576k RAM - banks 32-35

-- CARTS - "101 YYYY YYY0 0000 0000 0000" (BOT) - 2MB! 8kb banks

-- TODO, Dmitriy set these correctly!

SDRAM_CART_ADDR <= "101"&cart_select& "0000000000000";

-- BASIC/OS ROM - "111 XXXX XX00 0000 0000 0000" (BOT) (BASIC IN SLOT 0!), 2nd to last 512K

SDRAM_BASIC_ROM_ADDR <= "111"&"000000" &"00000000000000";

SDRAM_OS_ROM_ADDR <= "111"&rom_select &"00000000000000";

-- SYSTEM - "111 1000 0000 0000 0000 0000" (BOT) - LAST 512K

end generate;