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Jeanmarc- >thank you for your help. >The hardware engineer tells me : >on the DPS's output, there is a pull-up on each EMUx. Then the signals are >buffered... EM0 and EMU1 are bi-directional signals as far as CCS software is concerned. I looked quickly this morning at the DSK C6711 schematic. TI has used a SNCBT3257PW part, but I'm not sure if this is a buffer or a bi-directional bus switch. >Here the results of our tests : >We tested the signals (on our system and on the TI DSK-board C6711) with a >logical analyser. >The both TMS are identical. Our clock TCK is OK. >The only differences between the two boards are on the data (TDI and TDO). And the buffering issue; maybe you can ask the Texas Inst. Hotline () if CCS C6000 needs to see the EMUn signals as bi-directional. I know that for CCS C5000 this is definitely the case, having had to debug some hardware with this problem before. Jeff Brower DSP sw/hw engineer Signalogic >-----Message d'origine----- >De : Jeff Brower [mailto:] >Envoye : jeudi 31 mai 2001 16:03 >A : Jeanmar ROUXEL >Cc : >Objet : Re: [c6x] Problem with CCS and JTAG >Jeanmarc- > >>we are developing an electronic card with a C6711 DSP. We have a problem to >>use Code Composer Studio with our system. However, we have implementing a >>JTAG connector on it (the same as on the DSK C6711) but Code Composer >Studio >>doesn't want to communicate with it. Does somebody know which protocol is >>using Code Composer Studio to start the connection with the DSP by the JTAG > >Make sure: > > -C6711 reset line is not held low; JTAG cannot override > reset line if your board has a grip on it > > -EMU0 and EMU1 lines are pulled-up and not buffered > >Jeff Brower >DSP sw/hw engineer >Signalogic |