Revision 366
Added by markw over 10 years ago
| common/a8core/address_decoder.vhdl | ||
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end if;
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when "100" => -- 576k compy shop
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if (extended_access_cpu_or_antic='1') then
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extended_bank(4 downto 0) <= portb(7 downto 6)&portb(3 downto 1);
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extended_bank(5) <= not(or_reduce(portb(7 downto 6)&portb(3)));
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extended_bank(5 downto 0) <= '1'&portb(7 downto 6)&portb(3 downto 1);
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extended_self_test <= '0';
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end if;
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when "101" => -- 576k rambo
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if (extended_access_either='1') then
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extended_bank(4 downto 0) <= portb(6 downto 5)&portb(3 downto 1);
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extended_bank(5) <= not(or_reduce(portb(6 downto 5)&portb(3)));
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extended_bank(5 downto 0) <= '1'&portb(6 downto 5)&portb(3 downto 1);
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end if;
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when "110" => -- 1088k rambo
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if (extended_access_either='1') then
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| ... | ... | |
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end generate;
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gen_low_memory1 : if low_memory=1 generate
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-- TODO, check we can use 576k extended RAM ok (PROB NOT)
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-- SRAM memory map (1024k) for Aeon Lite
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SDRAM_CART_ADDR <= "000" & "111" & emu_cart_address(16 downto 0);
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SDRAM_BASIC_ROM_ADDR <= "000" & "110" & "00000000000000000";
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SDRAM_OS_ROM_ADDR <= "000" & "110" & "00100000000000000";
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-- SRAM memory map (1024k) for Aeon lite
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SDRAM_CART_ADDR <= "0000" & "1"&emu_cart_address(17 downto 0);
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SDRAM_BASIC_ROM_ADDR <= "000" & x"68000";
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SDRAM_OS_ROM_ADDR <= "000" & x"6c000";
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SDRAM_FREEZER_RAM_ADDR <= "000" & "001" & freezer_access_address;
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SDRAM_FREEZER_ROM_ADDR <= "000" & x"7" & freezer_access_address(15 downto 0);
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-- 0x10000-0x1FFFF (0x810000 in zpu space) = freeze backup - 64k
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-- 0x20000-0x3FFFF (0x820000 in zpu space) = freezer ram (128k)
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-- 0x40000-0x67FFF (0x840000 in zpu space) = carts - 160k
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-- 0x48000-0x67FFF (0x848000 in zpu space) = directory cache - 128k
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-- 0x68000-0x6FFFF (0x868000 in zpu space) = os rom/basic rom - 32k
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-- 0x70000-0x7FFFF (0x870000 in zpu space) = freezer rom (64k)
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end generate;
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gen_low_memory2 : if low_memory=2 generate
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-- TODO, check we can use 320k extended RAM ok (THINK SO)
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-- SRAM memory map (512k) for Papilio duo
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SDRAM_CART_ADDR <= "0000" & "01"&emu_cart_address(16 downto 0);
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Also available in: Unified diff
Aeon lite memory map improvements.