MCF5271 runnig from SDRAM

CM601 — Mon, 29 Jan 2007 20:21:08 GMT

Hello,
I have a custom board with the MCF5271 and Micron MT48LC4M32B2 SDRAM chip.
The memory test is working fine, i am able to read and write the whole memory, but when i try to run code from the SDRAM WITH cache enabled the program freeze after reaching the code above the first 1MB. With disabled cache it is executing code properly.

Re: MCF5271 runnig from SDRAM

ynaught — Fri, 09 Feb 2007 04:13:52 GMT

Hi,

Search for the thread "SDRAM configuration help"

I had problems on my board that may be from the same misconfiguration. In my case, all was well until I did a movem.l instruction, popping many registers off the stack.

The punchline was that I had configured the RAM for CAS2 and the CPU for CAS3 (or something like that); essentially because the table headers describing the SDRAM controller were confusing.

So... all worked well until the CPU and RAM got a chance to burst some data, then it screwed all up. Sounds similar to what you're describing.

Good luck!

topic MCF5271 runnig from SDRAM in ColdFire/68K Microcontrollers and Processors

MCF5271 runnig from SDRAM

Re: MCF5271 runnig from SDRAM