Hi Friends, I have a doubt that the xdata declaration is using the memory of 89c52 chip memory itself,or it needs any external memory .I used an array as xdata in 89c52 based project because i have to store a large data . Is it possible without any external memory ,such chips are not present in my hardware. I need your valuable help.
Yes, it seems you where right about the Miller caps being involved.
But because of the lead times (we have only RoHS-compliant products), I would have to get a new solder stencil to update the Miller caps. According to the datasheet, only the next generation Freescale processors has the improved DMA (Dynamic Memory Arbitration) with support for software-configurable Miller capacitors. Most probably on license from Signetics.
As a short-term solution, I managed to update the MMU configuration and now have a 4Mword (full 32-bit wide) ordered FINO queue up and running. And the good part with WOM in relation to normal non-volatile memory technologies is that it does not suffer from any wear from multiple write or erase cycles.
Per,
That's great! I'm glad to have helped out with that problem.
"ordered FINO" ?? I just don't think that is the best design.
The 'F' is already intrinsically 'ordered', so a double 'ordered' must either mean you have it wrong---which I doubt---or you have clearly have forgotten about De Morgan's little theorem.
Personally, I would just go ahead and change that 'ordered FINO' into a full blown RINO configuration.
--Cpt. Vince Foster 2nd Cannon Place Fort Marcy Park, VA
[ Sorry, George B. I credited Augustus D. with your work ]
Personally, I would just go ahead and change that 'ordered FINO' into a full blown RINO configuration. would a GINO not be easier to implememnt?
Erik
... GINO not be easier ... ?
True.
After validating data for storage, you have one of two choices; store the data into standard memory or not. The fact that you still have the data does not absolve you from dealing with it. You still must put that data somewhere. And this is what Signetics capitalized upon and is one of the main advantages of their WOM technology. A GINO construct works for that particular situation.
I was discussing the ordered-ordered situation where the double 'ordered' clearly translates into the non-ordered (hence Random).
Per is the only one who could determine if GINO is applicable. But it seems that his Freescale peripherals (MMU & DMA) might be set for Auto-G mode anyway.
I hope he is running his data through Freescale's on-chip CAU (Cryptographic Ambiguity Unit) to ensure it's safety & security.