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[/] [z80soc/] [trunk/] [V0.7.3/] [DE2115/] [vhdl/] [char_rom.VHD] - Blame information for rev 46

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Line No. Rev Author Line
1 46 rrred
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-- This design is part of:
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-- Z80SoC (Z80 System on Chip)
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-- Ronivon Candido Costa
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-- ronivon.costa@gmail.com
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--
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-- 2010 - 11 - 22
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--
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library IEEE;
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use  IEEE.STD_LOGIC_1164.all;
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use  IEEE.STD_LOGIC_ARITH.all;
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use  IEEE.STD_LOGIC_UNSIGNED.all;
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LIBRARY lpm;
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USE lpm.lpm_components.ALL;
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ENTITY Char_ROM IS
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        PORT(   clock                                           : IN    STD_LOGIC;
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                        character_address                       : IN    STD_LOGIC_VECTOR(7 DOWNTO 0);
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                        font_row, font_col                      : IN    STD_LOGIC_VECTOR(2 DOWNTO 0);
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                        rom_mux_output  : OUT   STD_LOGIC);
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END Char_ROM;
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ARCHITECTURE a OF Char_ROM IS
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        SIGNAL  rom_data: STD_LOGIC_VECTOR(7 DOWNTO 0);
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        SIGNAL  rom_address: STD_LOGIC_VECTOR(10 DOWNTO 0);
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BEGIN
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-- Small 8 by 8 Character Generator ROM for Video Display
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-- Each character is 8 8-bits words of pixel data
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 char_gen_rom: lpm_rom
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      GENERIC MAP ( lpm_widthad => 11,
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        lpm_numwords => 2048,
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        lpm_outdata => "UNREGISTERED",
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        lpm_address_control => "REGISTERED",
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-- Reads in mif file for character generator font data
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         lpm_file => "..\ROM\CHARROM.MIF",
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         lpm_width => 8)
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      PORT MAP ( inclock => clock, address => rom_address, q => rom_data);
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rom_address <= character_address & font_row;
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-- Mux to pick off correct rom data bit from 8-bit word
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-- for on screen character generation
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rom_mux_output <= rom_data ( (CONV_INTEGER(NOT font_col(2 downto 0))));
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END a;

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