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My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:06
by Lynxman
Strange.
TF536-02.jpg
My oscillator is a SIT8008BC-83-33E-100.000000T:
https://www.digikey.no/products/no?keyw ... 000000T-ND
I have another one I can try instead. I bought two of them.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:15
by Lynxman
I replaced the oscillator and get the same thing. Will try reflashing the CPLD.
EDIT:
Didn't change anything. Would be odd if it did. :)
EDIT:
Tried a 33 MHz (fake) CPU and get the same result.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:27
by alenppc
It really doesn't. Sysinfo is utter garbage. Try AIBB and you'll get way more accurate results.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:35
by Lynxman
AIBB 6.5 says CPU Clock is 40 MHz. :lol:
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:38
by Lynxman
I will take another look under the microscope. I know for sure there are no shorts but maybe a pin is lifted.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:41
by terriblefire
Lynxman wrote: 12 Jan 2021 18:38
I will take another look under the microscope. I know for sure there are no shorts but maybe a pin is lifted.
This is not possible. Like i couldnt make the board do that if i tried. It divides the input clock by 2. there is no known way to divide with logic like this.
Either there is an 80 mhz crystal on there, there is some tragic soldering between the CPLD and the CPU or the software is wrong.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 18:58
by Lynxman
The CPLD solderings are good. I tugged every one of them. I probably received the wrong oscillators. They don't have frequency scribed on them.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 19:06
by Lynxman
I don't think my solderings are bad. Every single leg has been pushed to check looseness.
TF536-03.jpg
I will order new ocsillators and replace them. I'm glad it still works with the lower frequency.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 19:22
by alenppc
Yes, it could be an 80 mhz crystal then, but the 536 will generally boot at that frequency only on a specific A500 revision (I think rev5 but not sure anymore), not on the other revs.
Re: My TF536 runs at 42.7 MHz with a 100 MHz oscillator.
Posted: 12 Jan 2021 19:25
by Lynxman
Will let you know how it does with the new parts when I get them. Might as well just leave it at 40 MHz since it works and put it in the A2000. It lets me use the cheap fake 030's. Will runu a raytrace to see if it's stable.
I'm loving the buffered IDE. I have a CF card thatdidn't work properly in my TF534's with a short IDE cable but works great here even with a long cable.