1 Reply Latest reply on May 16, 2012 11:34 PM by anand.srinivasan.asokan

    share of my debugging experience---why the transfer word are all zeros.

    yan.david

      Once I have encountered such a problem: all the bytes I write into the FIFO are zeros.

         

      I found external microprocessors  can't drive 68013A's databus easily. even the external microprocessors drive all the databits high. the voltage on the databus is only 0.7 volt. 

         

      it's so strange.

         

      so i was angry, i added the 16244a to drive the  datat bus, that time the 16244a finally drive the data bus to high as i want.

         

      however, the 68013 is very hot.

         

      it became stranger.

         

      I read the datasheet of 68013 again. i found out the 68013's digital gate is CMOS gate, it can be drive high easily theoretically.

         

      I don't know why it is so.

         

      finally one time i found out the SLOE is unconnect, immediately i understand that i set  the SLOE is active high ,but the unconnect pin is always about 2.4volt.

         

      so i pull down the SLOE pin . and the problem is resolved.