Re: thank you: write c6416 internal memory error.

Mike-

> The problem has been solved.The clock should be
> 50MHZ for tms320c6416,but use a clock of 100MHZ.Clock
> mode is x12,so DSP works error.
> Thank you very much.

Glad to hear you figured it out! Yes, if internal clock exceeds the spec anything
can happen -- results are undefined, including internal mem.

> I have another board. one tms320c6203,one
> sdram(MT48LC4M32B2TG-7 IT),dual-ram.When poduction
> date of sdram is 0608,DSP access sdram ok.When
> poduction date of sdram is 0704,DSP access sdram
> error.For example DSP writes 0x55 to sdram,then DSP
> writes 0xaa to sdram.The data of sdram will remain
> 0x55.The data 0xaa
> can not write in sdram.DSP should read SDRAM once.The
> data 0xaa can write in sdram.

I have seen the same issue before with some Micron SDRAMs. In the DSP code framework
we use on our company's products, we have a boot-time initialization routine that
reads all external mem locations at least once before turning control over to
DSP/BIOS + CSL.

-Jeff

> --- Jeff Brower wrote:
>
> > Mike-
> >
> > > I am using CCS memory display window for this
> > basic test.Beause
> > > this error I cannot load program to internal
> > memory by CCS.There are
> > > one tms320c6416, two 16 bits SDRAM(make one 32
> > bits SDRAM),two dual-
> > > memory,two flash,one fpga.I think maybe these
> > external components
> > > affect internal memory low 8 bits.The power of
> > tms320c6416 is not
> > > good,make tms320c6416 works distable. what does
> > mfg mean? Thank you .
> >
> > External devices have no effect on internal mem
> > unless it's something dramatic like a
> > short or output contention that is impacting the
> > entire C6416 device.
> >
> > Please explain "power of tms320c6416 is not good" --
> > what do you mean? Are you
> > saying you are measuring Vcc core to the C6416 and
> > it's not correct? Are you saying
> > it exceeds the device spec for ripple? For 720 MHz
> > you should see 1.4V, for 1 GHz
> > you should have 1.2V. Which one do you have?
> >
> > -Jeff
> >
> > P.S. Please post to the group, not to me.
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