hi:
Now,I have being study the DE2_TV,which is one of the DE2 board demo,in I2C_controller module,I have some problem as follows:
//////////////////////////////////////////////////
wire I2C_SDAT=SDO?1'bz:0 ;
case (SD_COUNTER)
6'd0 : begin ACK1=0 ;ACK2=0 ;ACK3=0 ; END=0; SDO=1; SCLK=1;end
//start
6'd1 : begin SD=I2C_DATA;SDO=0;end
6'd2 : SCLK=0;
//SLAVE ADDR
6'd3 : SDO=SD[23];
6'd4 : SDO=SD[22];
6'd5 : SDO=SD[21];
6'd6 : SDO=SD[20];
6'd7 : SDO=SD[19];
6'd8 : SDO=SD[18];
6'd9 : SDO=SD[17];
6'd10 : SDO=SD[16];
6'd11 : SDO=1'b1;//ACK
///////////////////////////////////////////////////
in the code above: I cannot understand the code "SDO=SD
",because if sd==1,I2C_SDAT will be "z",so how to output slave address?
thanks
