sram_rd.vhd

数字示波器的FPGA实现 VHDL编写 Quartus7.1测试通过

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY SRAM_RD IS
PORT(
      CLK: IN STD_LOGIC;
      DATASIN: IN STD_LOGIC_VECTOR(7 DOWNTO 0);
      DATAMOUT: OUT STD_LOGIC_VECTOR(7 DOWNTO 0);
      ADDRESSIN: IN STD_LOGIC_VECTOR(13 DOWNTO 0);
      ADDRESSOUT: OUT STD_LOGIC_VECTOR(13 DOWNTO 0);
      RD,CS,WR: IN STD_LOGIC;
      RDS: OUT STD_LOGIC
);
END ;

ARCHITECTURE ART OF SRAM_RD IS
SIGNAL ADDRESS: STD_LOGIC_VECTOR(13 DOWNTO 0);
BEGIN

DATAMOUT<=DATASIN;
ADDRESSOUT<=ADDRESS;
RDS<=RD;

PROCESS(CLK,WR,RD,CS)
BEGIN
IF CLK'EVENT AND CLK='1' THEN
    IF (WR='0')AND CS='0' THEN
        ADDRESS<=ADDRESSIN-1;
    ELSIF (RD='0') AND CS='0' THEN
        ADDRESS<=ADDRESS+1;
    END IF;
END IF;
END PROCESS;

--PROCESS(RD,CS)
--BEGIN
--IF RD'EVENT AND RD='0' THEN
--    IF CS='0' THEN
--
 --   END IF;
--END IF;
--END PROCESS;

END ART;