Sign in

Search adsp

Subscribe to adsp

adsp by Keywords

Discussion Groups

Discussion Groups | Analog Devices DSPs | JTAG and processor ID

Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).

Post a new Thread

JTAG and processor ID - Michael Rinder - Jan 28 13:57:00 2004

Hi, We are designing a board with more than one Tigersharc connected. The DSP's aren't goint to share memory i.e., they aren't connected in multiprocessor mode. They are on the other hand going to have separate SDRAM connected, which implies that they all need to have processor id = 000 (only ID0 initializes SDRAM). However, we would like to be able to access them via a single ICE- emulator and the JTAG-ports. Does the multiprocessor ID have anything to do with the use of the JTAG. i.e., can we have more than one Processor ID000 connected to the same JTAG chain? -We think we can but we aren't 100% certain. Thanx and regards Michael

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )

Re: JTAG and processor ID - Mike Rosing - Jan 28 17:10:00 2004

On Wed, 28 Jan 2004, Michael Rinder wrote: > We are designing a board with more than one Tigersharc connected. > The DSP's aren't goint to share memory i.e., they aren't connected in > multiprocessor mode. > They are on the other hand going to have separate SDRAM connected, which > implies that they all need to have processor id = 000 (only ID0 > initializes SDRAM). > > However, we would like to be able to access them via a single ICE- > emulator and the JTAG-ports. > > Does the multiprocessor ID have anything to do with the use of the JTAG. > i.e., can we have more than one Processor ID000 connected to the same > JTAG chain? > -We think we can but we aren't 100% certain. I've never had the opportunity to try it, but it should be fine. The JTAG chain is totally independent of processor number, the position in the chain determines which device you talk to. So it should work ok. Patience, persistence, truth, Dr. mike

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )

Re: JTAG and processor ID - Michael Rinder - Jan 29 7:58:00 2004

Thank you for your quick responses Friedrich and Dr. Mike. -In fact, I had my assumptions validated shortly after writing the mail by searching in comp.dsp. Thanx again Michael, Denmark

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )

Re: JTAG and processor ID - Kenneth Porter - Jan 30 19:31:00 2004

--On Wednesday, January 28, 2004 9:10 AM -0800 Mike Rosing <> wrote: > I've never had the opportunity to try it, but it should be fine. The JTAG > chain is totally independent of processor number, the position in the > chain determines which device you talk to. So it should work ok. My dual-21065L target actually had the processor ID's reversed from the JTAG order. Works fine, but confused the guy bringing up the board for the first time. ;)

(You need to be a member of adsp -- send a blank email to adsp-subscribe@yahoogroups.com )