i2creginout.tdf

基于fpga的屏幕测试程序

INCLUDE "i2cRegInOut";
INCLUDE "posedge";

PARAMETERS
   (
   SUBADDRESS=0,
   SUBADDRESSBITS=8,
   INOUTBITS=8
   );

CONSTANT I2CBUSWIDTH = SUBADDRESSBITS+20;

SUBDESIGN i2cRegInOut
   (
   i2cBusIn[I2CBUSWIDTH-1..0]: INPUT;
   i2cBusOut[I2CBUSWIDTH-1..0]: OUTPUT;
   in[INOUTBITS-1..0]: INPUT;
   out[INOUTBITS-1..0]: OUTPUT;
   read: OUTPUT;
   write: OUTPUT;
   )

VARIABLE
   IF (INOUTBITS>8) GENERATE
      highI2cOutReg: i2cRegInOut WITH (SUBADDRESS=SUBADDRESS+1,SUBADDRESSBITS=SUBADDRESSBITS,INOUTBITS=INOUTBITS-8);
      lowI2cOutReg:  i2cRgeInOut WITH (SUBADDRESS=SUBADDRESS  ,SUBADDRESSBITS=SUBADDRESSBITS,INOUTBITS=8);
   END GENERATE;
   IF (INOUTBITS<=8) GENERATE
      regOut[INOUTBITS-1..0]: DFFE;
      regIn[INOUTBITS-1..0]: DFFE;
      add[SUBADDRESSBITS-1..0]: NODE;
      dat[INOUTBITS-1..0]: NODE;
      clk,wr,rd: NODE;
      sel: SOFT;
   END GENERATE;

BEGIN
IF (INOUTBITS>8) GENERATE
   lowI2CInOutReg.i2cBusIn[]=i2cBusIn[];
   highI2CInOutReg.i2cBusIn[]=lowI2CInOutReg.i2cBusOut[];   
   i2cBusOut[]=highI2CInOutReg.i2cBusOut[];
   out[]=(highI2CInOutReg.out[],lowI2CInOutReg.out[]);
   highI2CInOutReg.in[]=in[INOUTBITS-1..8];
   lowI2CInOutReg.in[]=in[7..0];
   IF used(read) GENERATE
      read=highI2COutReg.read;
   END GENERATE;
   read=highI2COutReg.read;
   IF used(write) GENERATE
      write=highI2COutReg.write;
   END GENERATE;
END GENERATE;

IF (INOUTBITS<=8) GENERATE
   clk=i2cBusIn[0];
   wr=i2cBusIn[1];
   rd=i2cBusIn[2];
   add[]=i2cBusIn[I2CBUSWIDTH-1..20];
   dat[]=i2cBusIn[INOUTBITS+3..4];
   sel=(rd # wr) & add[]==SUBADDRESS;
   regOut[].clk=clk;
   out[]=regOut[].q;
   regOut[].ena=sel & wr;
   regOut[].d=dat[];
   regIn[].clk=clk;
   regIn[].ena=sel & rd;
   regIn[].d=in[];
   IF (INOUTBITS<8) GENERATE
      i2cBusOut[19..12]=i2cBusIn[19..12] & ((0,regIn[]) # !sel # !rd);
   END GENERATE;
   IF (INOUTBITS==8) GENERATE
      i2cBusOut[19..12]=i2cBusIn[19..12] & (regIn[] # !sel # !rd);
   END GENERATE;
   i2cBusOut[11..0]=i2cBusIn[11..0];
   i2cBusOut[I2CBUSWIDTH-1..20]=i2cBusIn[I2CBUSWIDTH-1..20];
   IF used(write) GENERATE
      write=posEdge(.clk=clk, .in=!(sel & wr));
   END GENERATE;
   IF used(read) GENERATE
      read=posEdge(.clk=clk, .in=!(sel & rd));
   END GENERATE;
END GENERATE;

END;