General questions about memories, configuration and FPGA systems.

Hi Ted,

I have bought M25P16 and replaced EPCS16 with it and hell yeaa that works great.

It's really substituting ~14 $ chip with ~1 $ one ! (digikey prices for one part). For EPCS64 and M25P64 the ratio is even greater - 32,5 $ compared to 3 $.

That really gives quite big memory range for lots of configurations with altera remote update.

I scoped the data clock of the memory when configuring the cyclone II, it was about 12,5 MHz.

I wasn't able to find any info about speeding that clock for EPCS devices. Memory itself says that it's max. clock is 75 MHz. The EPC (enhanced) chip was reffered to have variable data clock. Don't really know the difference between EPC and EPCS devices.

There are also EPCQ (quad SPI) devices. I have installed the newest Quartus II 12 lately and they were there. As farest i know they weren't available in older version of Quartus. There is a big chance that Altera used here also 'generic' quad SPI flash as their EPCQ, so one could also substitute that.

best regards,

madness