This message is from the T13 list server.
On Fri, 10 Sep 2004 21:39:53 +0900, [EMAIL PROTECTED] wrote: >This message is from the T13 list server. >(1) No one should drive DD15-8 during register reads. >(2) Many host systems pull the ATA DDx signals high. >None of this is in the standard document, but... >If (1) is true, shouldn't it be MANDATORY for the host >to pull up the DD15-8 ? This is a design issue for the host system. The host system could pull DDx up or down - that has no effect on how the ATA interface operates (the DDx signals are Tri-State). This is much like the INTRQ signal - some hosts pull it high, some hosts pull it low - some hosts are level triggered and some are edge triggered - none of this effects how the ATA interface operates - these are just internal host design issues. Hale *** Hale Landis *** www.ata-atapi.com ***
