true dual port dma on coldfire or other microcontroller?

I am looking for an economical, fast microcontroller to capture 8 bit grey video into ram at 20Mhz via DMA. The coldfire series looks promising but the documentation on the dma doesn't really say if it is true dual port. I have interfaced dual port rams to PCs before, and a true dual port would allow full speed writing via dma while the cpu is accessing the other side at full speed, and the only time the cpu would be waiting is when it tried to access exactly the same address byte that the dma is writing to.

I cant tell from the datasheet if it delays all cpu cycles while writing dma.

I have been burnt too many times by datasheets that claim to do something and then I waste a lot of time finding out it was written by the marketing guy.

The Blackfin dsp series seems to have true dual port, but I don't like the look of the instruction set, I think it has a higher learning curve than a normal microcontroller.

If Coldfire is not true dual port, does anyone know a similar microcontoller with inbuilt ram (80 mips +) that has true dual port dma?

Thanks

Reply to
smirb
Loading thread data ...

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.