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

This is not a version of the TINIOS. This is code that runs before the TINI OS
runs.

Chris

-----Original Message-----
From: Bruce Boyes [mailto:[email protected]] 
Sent: Wednesday, March 24, 2004 11:18 AM
To: [email protected]; 'Samuel Fruchter'; [email protected]
Subject: RE: [TINI]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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