Post by thread:[PIC]: JTAG

Hello piclister, Sorry to post this in the list. Anyone have an article of JTAG ? Protocol, Hardware interface, programs, etc.. ? Thanks in advance. Gus -- Digiled spam_OUTmailTakeThisOuTdigiled.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

I googled for this recently and came up with a lot of good info. Cheers, -Neil. On Tuesday 03 June 2003 11:45, Digiled dot com scribbled: > Hello piclister, > Sorry to post this in the list. > > Anyone have an article of JTAG ? Protocol, Hardware interface, > programs, etc.. ? > Thanks in advance. > Gus -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

google search should find a source, but look on Altera's website for a programmer, etc serial in, serial out, clock is about it {Quote hidden}>From: Digiled dot com <.....mailKILLspam@spam@DIGILED.COM> >Reply-To: pic microcontroller discussion list <PICLISTKILLspamMITVMA.MIT.EDU> >To: .....PICLISTKILLspam.....MITVMA.MIT.EDU >Subject: [PIC]: JTAG >Date: Tue, 3 Jun 2003 13:45:18 -0300 > >Hello piclister, > Sorry to post this in the list. > > Anyone have an article of JTAG ? Protocol, Hardware interface, > programs, etc.. ? > Thanks in advance. > Gus > >-- > Digiled EraseMEmailspam_OUTTakeThisOuTdigiled.com > >-- >http://www.piclist.com hint: The PICList is archived three different >ways. See http://www.piclist.com/#archives for details. _________________________________________________________________ -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

> -----Original Message----- > From: Tim Webb [SMTP:tim_webbspam_OUTAGILENT.COM] > Sent: Tuesday, June 03, 2003 5:58 PM > To: @spam@PICLISTKILLspamMITVMA.MIT.EDU > Subject: Re: [PIC]: JTAG > > What is JTAG? > > I keep seeing this word somewhere and I keep wondering what it is or > stands for. > > What is is used for? > JTAG = Joint Test Action Group. It is a defined five pin hardware and serial communication protocol to primarily allow JTAG equipped complex IC's to be daisy chained together and functionaly tested in circuit. It is also used as a programming protocol for some devices. Regards Mike ======================================================================= This e-mail is intended for the person it is addressed to only. The information contained in it may be confidential and/or protected by law. If you are not the intended recipient of this message, you must not make any use of this information, or copy or show it to any person. Please contact us immediately to tell us that you have received this e-mail, and return the original to us. Any use, forwarding, printing or copying of this message is strictly prohibited. No part of this message can be considered a request for goods or services. ======================================================================= Any questions about Bookham's E-Mail service should be directed to KILLspampostmasterKILLspambookham.com. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.

>Sounds interesting, would you happen to know where I could see a simple example of a JTAG circuit application or any part numbers of IC's using JTAG so that I can look up the data sheet. >Thanks, >Tim >JTAG = Joint Test Action Group. It is a defined five pin hardware and >serial communication protocol to primarily allow JTAG equipped complex IC's >to be daisy chained together and functionaly tested in circuit. It is also >used as a programming protocol for some devices. >Regards >Mike JTAG is a lot like SPI. In fact, it has the same reset-clock-data-in/out connections. The one I saw ran at 10 MHz. There may be some kind of command/data protocol but I think most of the protocol is specific to the JTAG hardware inside each processor. It can be used to read out the state of each pin, some or all registers, and anything else the manufacturer/designer saw fit to connect it to. Likewise you can write to these things to pre set them. The way JTAG can load a program is by using memory write cycles to place a program in memory...usually a loader program. ARM processors have it. So did the Pentium II (but not the AMD). Probably later Pentium chips but I don't know. Barry -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email RemoveMElistservTakeThisOuTmitvma.mit.edu with SET PICList DIGEST in the body

Altera 7xxx series use JTAG and JAM >From: Tim Webb <spamBeGonetim_webbspamBeGoneAGILENT.COM> >Reply-To: pic microcontroller discussion list <TakeThisOuTPICLISTEraseMEspam_OUTMITVMA.MIT.EDU> >To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU >Subject: Re: [PIC]: JTAG >Date: Wed, 4 Jun 2003 10:33:55 -0600 > >Thanks Mike, > >Sounds interesting, would you happen to know where I could see a simple >example of a JTAG circuit application or any part numbers of IC's using >JTAG so that I can look up the data sheet. > >Thanks, > >Tim > >{Original Message removed}