Ross: Interesting indeed. Nigel has just got his running by replacing his RamBlade. The old one still failed at 5MHz. I tried here with 5MHz and got a working RamBlade to fail. I think something is marginal and it is pointing to the SRAM so I will be working to find the problem.
Overclocking requires a clean power supply and excellent decoupling to work successfully.
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Okay - I will continue to run at 80Mhz until you track it down. But I should point out that some of the programs that fail on my RamBlade are quite simple programs that do not use either the SRAM or the SDCard. If I am reading the schematic correctly, when you just do nothing with pins P19 and P20 (the enable pins for these components) then each of them should be pulled high - therefore I don't understand how just changing the clock frequency would affect anything. This is why I thought it might be a power supply problem, caused by the Prop not being able to draw sufficient power when it is being overclocked - but remember that this comes from a software engineer who can barely solder two wires together, and who may be talking utter nonsense!
Ross.
P.S. What is U3? I can't find a description of this chip, but I note it is also connected to the enable pin of the SRAM.
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Catalina - a FREE C compiler for the Propeller - see Catalina
Today I shortened the power lead I run from the TriBladeProp to the RamBlade from about 20cm to about 5cm - and now Catalyst seems to be stable at 100Mhz (6.25Mhz crystal), but it still fails at 104Mhz (6.5Mhz crystal).
Could the length of the power leads make that much difference?
Ross.
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Catalina - a FREE C compiler for the Propeller - see Catalina
Short answer YES. If them are not big enough in diameter to forward enough current NEEDED for propeller in phases I described in my Thread on good decoupling on Propeller.
As I said in that thread "Propeller are variable CURRENT device that needs much power in wake up states"
That give all designs be careful on Power traces/planes to be correct.
Regards
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Nothing is impossible, there are only different degrees of difficulty. For every stupid question there is at least one intelligent answer. Don't guess - ask instead. If you don't ask you won't know. If your gonna construct something, make it·as simple as·possible yet as versatile as posible.
I think that if You use rough wires to it and on it BIG electrolytic CAP directly with Power input wires it will work
Regards
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Nothing is impossible, there are only different degrees of difficulty. For every stupid question there is at least one intelligent answer. Don't guess - ask instead. If you don't ask you won't know. If your gonna construct something, make it·as simple as·possible yet as versatile as posible.
Sapieha, thanks for helping Ross. I have been off-air for 36 hrs. Time will also be limited over the next few days.
There is also a Possibility that the connectors used to jump the power across may not be able to handle the surge current. For that reason a >= 100uF electrolytinc cap on the RamBlade may be necessary. It was my intention it would be plugged directly into a Prop ProtoBoard so there would be very little power supply length. However, I use about 20mm cables for the power supply from my TriBlade.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Links to other interesting threads:
I would expect that 100uF would be fine presuming you are taking the 3v3 from the TriBlade. Perhaps if you have a 1000uF you could place it across C11.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Links to other interesting threads:
Comments
Overclocking requires a clean power supply and excellent decoupling to work successfully.
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Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
Okay - I will continue to run at 80Mhz until you track it down. But I should point out that some of the programs that fail on my RamBlade are quite simple programs that do not use either the SRAM or the SDCard. If I am reading the schematic correctly, when you just do nothing with pins P19 and P20 (the enable pins for these components) then each of them should be pulled high - therefore I don't understand how just changing the clock frequency would affect anything. This is why I thought it might be a power supply problem, caused by the Prop not being able to draw sufficient power when it is being overclocked - but remember that this comes from a software engineer who can barely solder two wires together, and who may be talking utter nonsense!
Ross.
P.S. What is U3? I can't find a description of this chip, but I note it is also connected to the enable pin of the SRAM.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Catalina - a FREE C compiler for the Propeller - see Catalina
Today I shortened the power lead I run from the TriBladeProp to the RamBlade from about 20cm to about 5cm - and now Catalyst seems to be stable at 100Mhz (6.25Mhz crystal), but it still fails at 104Mhz (6.5Mhz crystal).
Could the length of the power leads make that much difference?
Ross.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Catalina - a FREE C compiler for the Propeller - see Catalina
Short answer YES. If them are not big enough in diameter to forward enough current NEEDED for propeller in phases I described in my Thread on good decoupling on Propeller.
As I said in that thread "Propeller are variable CURRENT device that needs much power in wake up states"
That give all designs be careful on Power traces/planes to be correct.
Regards
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.
Sapieha
Thanks. Would adding more decoupling caps on the RamBlade also help? If so, can you suggest where they may be added?
Ross.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Catalina - a FREE C compiler for the Propeller - see Catalina
I think that if You use rough wires to it and on it BIG electrolytic CAP directly with Power input wires it will work
Regards
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Nothing is impossible, there are only different degrees of difficulty.
For every stupid question there is at least one intelligent answer.
Don't guess - ask instead.
If you don't ask you won't know.
If your gonna construct something, make it·as simple as·possible yet as versatile as posible.
Sapieha
I'll try it out - thanks.
Ross.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Catalina - a FREE C compiler for the Propeller - see Catalina
There is also a Possibility that the connectors used to jump the power across may not be able to handle the surge current. For that reason a >= 100uF electrolytinc cap on the RamBlade may be necessary. It was my intention it would be plugged directly into a Prop ProtoBoard so there would be very little power supply length. However, I use about 20mm cables for the power supply from my TriBlade.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz
I have already installed a 100uF electolytic (C11). Do you mean a larger one may be required?
Ross.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Catalina - a FREE C compiler for the Propeller - see Catalina
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Links to other interesting threads:
· Home of the MultiBladeProps: TriBlade,·RamBlade,·SixBlade, website
· Single Board Computer:·3 Propeller ICs·and a·TriBladeProp board (ZiCog Z80 Emulator)
· Prop Tools under Development or Completed (Index)
· Emulators: CPUs Z80 etc; Micros Altair etc;· Terminals·VT100 etc; (Index) ZiCog (Z80) , MoCog (6809)·
· Prop OS: SphinxOS·, PropDos , PropCmd··· Search the Propeller forums·(uses advanced Google search)
My cruising website is: ·www.bluemagic.biz·· MultiBlade Props: www.cluso.bluemagic.biz