FPGA控制双口RAM cy7c025

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mfcn|

楼主 | 2007-3-14 01:47 | 只看该作者回帖奖励

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双口RAM, 控制, FPGA, TE, WRITE

FPGA控制双口RAM cy7c025,写数据0x5555,单片机读数据不是0x5555.
请熟悉的兄弟看看，我的程序可有错误？

RAM_WRITE:process(RAM_CURRENT_STATE,address_cnt) --DRAM写入控制状态机时序进程
begin
case RAM_CURRENT_STATE is
when START_WRITE =>           --DRAM初始化
  ram_cs <= '1';
  ram_wr <= '1';
  ram_rd <= '1';
  address_plus <= '0';
  RAM_NEXT_STATE <=  WRITE1;

  when WRITE1 =>
  ram_cs <= '0';
  ram_wr <= '1';
  codeaddress <= address_cnt;
  RAM_NEXT_STATE <=  WRITE2;

  when WRITE2 =>  --ad1数据写向DRAN
  ram_cs <= '0';
  ram_wr <= '0';
  ram_data <= X"5555";                    --addata1;
  ram_rd <= '1';

  RAM_NEXT_STATE <=  WRITE3;

  when WRITE3 =>
  ram_cs <= '0';
  ram_wr <= '1';
  ram_rd <= '1';
  address_plus <= '1';
  RAM_NEXT_STATE <= WRITE_END;

  when WRITE_END =>
  ram_cs <= '1';
  ram_wr <= '1';
  ram_rd <= '1';
  address_plus <= '0';
  RAM_NEXT_STATE <=START_WRITE;

  when others =>                  --所有闲置状态导入初始态
  RAM_NEXT_STATE <=START_WRITE;
end case;
end process;

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