Error: Booting at higher frequencies!!!!

Hi

I am workin gon the customised board with ADSp 21160 and 25 MHz
crystal on it.
I am having problem in booting at higher frequency ie, at 100 Mhz(4:1
Clk cfg).

At 2:1 the boot code is working fine.

There is a slight variation in the boot code that is getting copied at
the location in 3:1 clk cfg.

Consider this part of code that is getting copied at 2:1 in the
mentioned location

0x4006A dm(0x41)=m13;
0x4006B dm(0x46)=m14;
0x4006C i15=0x40004;
0x4006D call 0x400ea;



Now, at 3:1 clk cfg on boot the following code is getting written in
the same location as

0x4006A dm(0x41)=m13;
0x4006B dm(0x46)=m14;
0x4006C i15=0x40004;
0x4006D jump 0x4006a;
The instruction at 0x4006D is jumping back to 0x4006A and this is
executing infinitely. Thus the application code not getting written.

What might be the problem? Why is the instruction at 0x4006d changing
from call to jump at 3:1 clk cfg?
At 4:1 clk cfg at location 0x40005 the following code is getting copied



0x40005 if sv jump 0x40044(db)
0x40006 nop;
0x40007 nop;
0x40008 if sv rti;
0x40009 if sv rti;



0x40051 if not lce rti(db);
0x40052 r6=0;
0x40053 if ac;
0x40054 if not lce jump(pc,0);
0x40055 r0 = 0;
0x40056 m4=0;

Here at the location 0x40005 what does the sv stand for ? Similarly in
0x40008 & 0x40009?


Thanks and Regards
Stevean

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On Tue, 12 Dec 2006, rk_stevean wrote:

> Hi
>
> I am workin gon the customised board with ADSp 21160 and 25 MHz
> crystal on it.
> I am having problem in booting at higher frequency ie, at 100 Mhz(4:1
> Clk cfg).
>
> At 2:1 the boot code is working fine.
>
> There is a slight variation in the boot code that is getting copied at
> the location in 3:1 clk cfg.
>
> Consider this part of code that is getting copied at 2:1 in the
> mentioned location
>
> 0x4006A dm(0x41)=m13;
> 0x4006B dm(0x46)=m14;
> 0x4006C i15=0x40004;
> 0x4006D call 0x400ea;
>
> Now, at 3:1 clk cfg on boot the following code is getting written in
> the same location as
>
> 0x4006A dm(0x41)=m13;
> 0x4006B dm(0x46)=m14;
> 0x4006C i15=0x40004;
> 0x4006D jump 0x4006a;
> The instruction at 0x4006D is jumping back to 0x4006A and this is
> executing infinitely. Thus the application code not getting written.
>
> What might be the problem? Why is the instruction at 0x4006d changing
> from call to jump at 3:1 clk cfg?

I'm betting it's the speed of your boot flash. First copy every thing
from flash at 25MHz, then turn on the PLL. If you have to copy code after
that, put enough wait states into the bus to slow the transfer down so you
meet the timing constraints on the flash.

Patience, persistence, truth,
Dr. mike Start a New Thread