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

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Anonymous
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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.

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1 Reply
Anonymous
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 Hi,

   

Thanks for sharing your debugging experience here. Appreciate it.

   

Regards,

   

Anand

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