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It is possible, but with a few caveats. Not every device on the market is truly "ready" when it clears BSY and sets RDY. There are devices which set status 50h, then do some other stuff, then hit the INTRQ line when they are really done. This includes some recently produced devices. Depending on your product, you may or may not run into this problem. The other thing to ask yourself is whether you can afford to poll the drive's status register to see when it is done with a command. Certainly in a personal computer you wouldn't want to, but in some kinds of embedded applications you might have plenty of cpu cycles or even hardware you can dedicate to this task. At 3:53 PM -0800 1/21/02, liman Munandar wrote: >This message is from the T13 list server. > > >Dear T13: > >Does anyone know where I can get more info on the use of the interrupt? The >question I have is whether the INTRQ pin is optional or not. I have a design >using a chip with ATA/ATAPI interface. The INTRQ pin was left open. I wonder >if this is ok. Can an ATA/ATAPI device operate without any interrupt >service? > >Thank you in advance. > >Regards, > >Liman Munandar >Associate Engineer >Dura Micro > > >Subscribe/Unsubscribe instructions can be found at www.t13.org. -- --------------------- I make stuff go. --------------------- Larry Barras Apple Computer Inc. 1 Infinite Loop MS: 306-2TC Cupertino, CA 95014 (408) 974-3220 Subscribe/Unsubscribe instructions can be found at www.t13.org.
