Re: Cygnal/Silabs F12x MAC0, does it work?

Question

Hi Gary,I supposed that the IDE might have a problem reading out theMAC0 registers. That's why I did move the result from theMAC0ACCx registers to variables in the DATA space, and watchthese variables. But these variables are always zero too :-(It's the original IDE from Silicon Labs, latest version 1.9downloaded from their website.Of course I asked them before I posted the problem here.No answer from them since 3 days :-(Michael

Michael Koch · Accepted Answer

Hi,yes, SFRPAGE = 3have you already tested the MAC0?Michael

Michael Koch · Answer

Hi Gary,that's correct.No, there is no simulator mode. seems to be coming through just fine.agreed. Everything else is working fine in these chips.There have never been any problems with the JTAG interface. Michael

enst · Answer

have you set SFRPAGE register?"Michael Koch"  ????news:

Gary Kato · Answer

MAC0ACC3 should be 0 and MAC0ACC2 should be 03 with the values you are using.

Sometimes there can be bad chip batches, but you tried a 122 and a 123 and the odds that those two would exhibit the same problem would be small, as far as I know. Of course, for all I know the 123 is just a 122 in a different package and they might be from the same batch.

It's probably not something to do with external hardware as the multiplier is completely internal.

It's not an SFR watch window problem since you're reading them into low RAM as well and they confirm that it's 0. The MAC status seems to read fine and it also says it's 0.

Does the IDE have a simulator mode? If so, does that work?

I wouldn't think it has anything to do with any JTAG weirdness as other stuff seems to be coming through just fine.

I'm stumped. Hopefully Silicon Labs will be able to shine some light on what is going on.

Michael Koch · Answer

Hi Gary,I have already tested at the default clock and at 99MHz.Same negative results.Michael

Gary Kato · Answer

About the only other thing I can think of to try is to use a faster clock. Onreset, the internal 24MHz oscillator is used and that is divided by 8 togenerate the SYSCLK. You might try changing it to divide by 1. People tend tooperate at faster speeds so maybe the MAC wasn't tested at the default 3MHzSYSCLK.

Deni · Answer

I have tested it on Keil's uV2 with C8051F120 and everyting works assupposed...regardsDejan

Michael Koch · Answer

Hi Dejan,it's good to hear that it works. Seems that I got some earlyprototypes with a bug in the silicon. Hopefully SiLabs will shine some light on this problemsoon...Thanks,Michael

Michael Koch · Answer

Hi all,the problem is solved. Silicon Labs answered that it's a bugin the silicon in F122/F123 controllers that were shippedbefore October 31, 2003.Thanks,Michael

Gary Kato · Answer

So much for their quality control.

Re: Cygnal/Silabs F12x MAC0, does it work?

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