[SI-LIST] Re: TMS320 DSP

Peter,

As long as TMOD is pulled up, the TAP controller will not start.  So, just 
a pull-up on TMOD is safe for the case of no external equipment connection, 
and removes the conflict of pull-up and pull-down.  The external JTAG 
controller will drive TRST to the proper level when connected.

Regards,


Steve.

At 02:27 PM 12/17/2002 +0800, peter zhu wrote:
>you should provide both pullup and pulldown for select as the datasheet said
>
>----- Original Message -----
>From: "steve weir" <weirsp@xxxxxxxxxx>
>To: <si-list@xxxxxxxxxxxxx>
>Sent: Tuesday, December 17, 2002 2:07 PM
>Subject: [SI-LIST] Re: TMS320 DSP
>
>
> >
> > Gopalakrishnan,
> >
> > It is generally OK to have the TRST pin pull down, provided that the TMOD
> > pin and TCLK pins are both pulled-up.
> >
> > Regards,
> >
> >
> > Steve.
> > At 10:54 AM 12/17/2002 +0530, Gopalakrishnan Sethuraj wrote:
> > >Hai
> > >
> > >I have one doubt on the TMS320C6414 DSP.here JTAG port used for both
> > >boundary scan emulator operation of DSP.In emulator   related document
> > >they have mentioned, the JTAG TRST pin should not be connected to pull
> > >up.This pin having internal pull down on the DSP chip itself.but
> > >boundary scan mode they have mentioned TRST pin need to be connected to
> > >pull up.
> > >
> > >My doubt is if we provide the pull-up for TRST pin, weather it affect
> > >the emulator operation?
> > >
> > >Regards
> > >Gopalakrishnan.S
> > >Project Engineer
> > >Wipro Technologies
> > >Lakshmi buliding,Begumpet,
> > >Secunderabad-500003
> > >Tel-91-40-27906008,Ext-4625
> > >Fax-91-40-27907123
> > >
> > >
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