RE: TStik Multiplier and crystal speed, TINI version, flash based code storage

At 09:48 AM 3/23/2004 -0600, Chris Fox wrote:

>Platforms that run the 80C400 at 4X (74 MHz) do so by using fast SRAM without
>battery back-up. They do this by using a flash memory that holds an image of
>the RAM contents. At start-up, the system runs at 1X and copies the flash to
>the SRAM, and then switches to 4X as it runs from the SRAM. This has
>disadvantages in that any data that you want to be persistent through a reset
>or power loss must be stored in the flash. (The file system is in RAM and so
>goes away with each reset.) And, writes to the slower flash memory must use
>stretch-cycles to do so, so native code is certainly required.
>
>On the other hand, this makes for a highly reliable system because the RAM
>code is restored from flash at every reset, so corrupted code in the RAM gets
>fixed on every reset.
>
>Chris

Do you know if Dallas has any plans to make this version of TINIOS a 
standard release?

On a related note, Shawn Silverman is working on a system which would 
restore from flash every time you boot up, rather than using the NVRAM file 
system. This would potentially add some more robustness to systems with a 
lot of flash such as TStik which comes with 2 MBytes.

Bruce


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