This message is from the T13 list server.
Hi Gana, Yes that is correct. Software still sees a DEV bit, as before. The manipulation of what cycle goes to which port (as per DEV bit) is done by the HBA. The master-slave framework held by software still holds. Everything that software expects on a parallel ATA channel with a master device and slave device on the parallel cable can be emulated by an HBA with two devices on two serial cables. But, pointed out by Edwin J. Pole II, that is outside the scope of the serialATA specification, so it's more of an issue of what the HBA supports. T.E. -----Original Message----- From: Gana Pat [mailto:[EMAIL PROTECTED]] Sent: Thursday, July 25, 2002 6:35 PM To: Ooi, Thien Ern; [EMAIL PROTECTED] Subject: Re: [t13] SATA Hi Thien Ern, If this is the case, then the software would be making use of the device bit in the Device Selection Register to switch between the devices in two ports ? And for the software, the master/slave terminology holds good, am I correct ? Thanks, Gana ----- Original Message ----- From: "Ooi, Thien Ern" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, July 25, 2002 5:20 PM Subject: RE: [t13] SATA > This message is from the T13 list server. > > > The host controller does whatever it takes to emulate the appearance of a > master-slave pair to software; while simultaneously doing what it takes to > make each device think that it is in a "master-only" configuration on the > serialATA cable. This is left as an exercise to the HBA implementer, and > can be derived from the parallel ATA specification as to what software > expects from a "master-slave" configuration, while simultanenously treating > both devices as "master-only" from a hardware perspective - even though one > of them may in fact be a slave device, as far as software is concerned. > > Regards, > T.E. > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] > Sent: Thursday, July 25, 2002 4:26 PM > To: [EMAIL PROTECTED]; [EMAIL PROTECTED]; [EMAIL PROTECTED] > Cc: [EMAIL PROTECTED] > Subject: RE: [t13] SATA > > > This message is from the T13 list server. > > > The draft version of the SATA spec. that I have describes "Master-only > emulation" in section 5.2.1, but unfortunately it also describes an optional > "Master/Slave emulation" in section 5.2.2. > > Regards, > Wendell > > -----Original Message----- > From: Harlan Andrews [mailto:[EMAIL PROTECTED]] > Sent: Thursday, July 25, 2002 6:06 PM > To: Brian A. Berg; Mark Overby > Cc: T13 List Server > Subject: Re: [t13] SATA > > This message is from the T13 list server. > > > As I understand it, the proposal is for master ONLY. No slave on the > SATA bus. > > ...Harlan > > > >This message is from the T13 list server. > > > > > >I think the original question was > > "Does SATA support only a master and slave on each bus?" > >___________________________________________________________________ > > Brian A. Berg [EMAIL PROTECTED] Voice: 408.741.5010 > > Berg Software Design FAX: 408.741.5234 > > P.O. Box 3488 visit the Storage Cornucopia at www.bswd.com > > 14500 Big Basin Way, Suite F Consulting: SCSI/FC/SAN/storage > > Saratoga, CA 95070 USA > > > > > >> You've hit on one of the great flaws of storage adapters. There isn't a > host > >> controller standard for serial - ata (yet, cross fingers). > >> > >> -----Original Message----- > >> From: Gana Pat [mailto:[EMAIL PROTECTED]] > >> Sent: Thursday, July 25, 2002 11:39 AM > >> To: Gary Laatsch > >> Cc: [EMAIL PROTECTED] > >> Subject: Re: [t13] SATA > >> > >> Thanks Gary, > >> > >> But the Serial ATA spec does not talk about the software much. It says > its > >> software compatible with the predecessors. But I am not sure how it is > done. > >> Do you know any pointers where I can get more details on the Serial ATA > HBAs > >> and their standards ? > >> > >> Gana > >> > >> ----- Original Message ----- > >> > >> From: Gary <mailto:[EMAIL PROTECTED]> Laatsch > >> To: Gana Pat <mailto:[EMAIL PROTECTED]> > >> Sent: Thursday, July 25, 2002 10:25 AM > >> Subject: RE: [t13] SATA > >> > >> www.serialata.org <http://www.serialata.org> . You can find the spec. > >> there. > >> > >> gary laatsch > >> > >> -----Original Message----- > >> From: Gana Pat [mailto:[EMAIL PROTECTED]] > >> Sent: Thursday, July 25, 2002 10:02 AM > >> To: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > >> Subject: [t13] SATA > >> > >> Hi , > >> > >> Can I discuss regarding Serial ATA here ? > >> > >> If yes here goes my questions. > >> > >> I heard that the SATA is software compatible with Parallel ATA. But how > far > >> it holds good in terms of devices per channel (port) ? I heard that they > are > >> also working on the Hubs with which you can connect more devices per > >> channel. Is this true ? > >> > >> Anyone knows any info on this ? > >> > >> Your help is highly appreciated. > >> > >> Thanks, > >> > >> Gana >
