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用altera的EPM7128做地址译码和IO扩展，代码如下：<br /><br />`define IOCADDR 9'h1f8 // IO_C地址, (0x1F800-0x1F8FF), input<br />`define IOFADDR 9'h1f9 // IO_F地址, (0x1F900-0x1F9FF), input<br />`define IOAADDR 9'h1fa // IO_A地址, (0x1FA00-0x1FAFF), output<br />`define IOBADDR 9'h1fb // IO_B地址, (0x1FB00-0x1FBFF), output<br />`define IODADDR 9'h1fc // IO_D地址, (0x1FC00-0x1FCFF), output<br />`define IOEADDR 9'h1fd // IO_E地址, (0x1FD00-0x1FDFF), output<br /><br />`define CSRAM 9'h1f8 // 外部扩展RAM选通信号, 126k空间 (0x00000-0x1F7FF)<br /><br /><br />module Main (lowAddrData, highAddr, lowAddr, ale, wr, rd, <br /> csRAM, ioaVector, iobVector, iocVector, <br /> iodVector, ioeVector, iofVector) ;<br /> inout [7:0] lowAddrData ;<br /> input [16:8] highAddr ;<br /> input ale, wr, rd ;<br /> output [7:0] lowAddr = 8'hff ;<br /> output csRAM = 'b1 ;<br /> output [7:0] ioaVector = 8'hff ;<br /> output [7:0] iobVector = 8'hff ;<br /> input [7:0] iocVector ;<br /> output [7:0] iodVector = 8'hff ;<br /> output [7:0] ioeVector = 8'hff ;<br /> input [7:0] iofVector ;<br /><br /> wire [7:0] lowAddrData ;<br /> reg [7:0] lowAddrData_Input ;<br /> reg csRAM ;<br /> reg [7:0] lowAddr ;<br /> reg [7:0] ioaVector ;<br /> reg [7:0] iobVector ;<br /> wire [7:0] iocVector ;<br /> reg [7:0] iodVector ;<br /> reg [7:0] ioeVector ;<br /> wire [7:0] iofVector ;<br /><br /> always // 锁存低8位地址<br /> @ (negedge ale)<br /> begin<br /> lowAddr = lowAddrData ;<br /> end<br /> <br /> always // 地址译码，RAM CS为低电平 <br /> @ (ale or highAddr) // 电平触发<br /> begin<br /> if ( ale == 1 )<br /> csRAM = 'b1 ;<br /> else<br /> if ( highAddr < `CSRAM )<br /> csRAM = 'b0 ;<br /> else<br /> csRAM = 'b1 ;<br /> end<br /><br /> always // 写数据<br /> @ (negedge wr) // 下降沿触发<br /> begin<br /> if ( highAddr >= `IOEADDR )<br /> ioeVector[7:0] = lowAddrData[7:0] ;<br /> else if ( highAddr >= `IODADDR )<br /> iodVector[7:0] = lowAddrData[7:0] ;<br /> else if ( highAddr >= `IOBADDR )<br /> iobVector[7:0] = lowAddrData[7:0] ;<br /> else if ( highAddr >= `IOAADDR )<br /> ioaVector[7:0] = lowAddrData[7:0] ;<br /> end<br /><br /> assign lowAddrData[7:0] = lowAddrData_Input[7:0] ;<br /><br /> always // read data<br /> @ (negedge rd) // negedge trig<br /> begin<br /> if ( highAddr >= `IOFADDR )<br /> lowAddrData_Input[7:0] = iofVector[7:0] ;<br /> else if ( highAddr >= `IOCADDR )<br /> lowAddrData_Input[7:0] = iocVector[7:0] ;<br /> end<br /><br /><br />endmodule <br /><br /><br />用quartus 5.0时正常，但在quartus 7.1中出现很多警告，大家看看有没有问题？<br /><br /> |
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