IDE knowledge anyone?

Brad Parker brad at
Mon Dec 7 17:35:51 CST 2015

On 12/7/15 6:52 AM, Oliver Lehmann wrote:

I don't have much to offer, but I have done PIO IDE accesses on lots of 
cpu's, including small ARM cpu's.  I would put the code into a "read 
loop" and "write loop" and look at the signals with a scope. Make sure 
they look good - i.e. clean edges and the width of the assertion is 
"ok".  I think the minimum is something like 300ns (I may be wrong, 
that's what I remember).   And make sure the address is stable before 
you assert WE# - I'd check that with a scope as well.  If you don't have 
a scope a simple logic analyser will work, but a scope is better.

I seem to recall some drives got unhappy if some of the signals on the 
IDE interface were not exactly right - several need to be grounded and 
several pulled up with a resistor.  You don't mention what your physical 
interface is.  If you do I can dig up my notes and tell you what I've 
done in the past (not that it's authoritative, but it's something to 
compare with).

I'm sure you'll figure it out - just keep trying :-)


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