I understand; I'm just back-seating anyway.
Where did you get the boards done?
Also, do you have any idea how fast the counter you made can go?
Where did you get the boards done?
Also, do you have any idea how fast the counter you made can go?
I'm not sure about the maximum speed. The flipflop, for instance, has a delay of 14ns; if we take that as average, each slice has to go through 5 parts (input mux, LUT, flipflop, async select mux, output enable) for a total delay of 70ns, so in theory one slice could do about 14MHz. Since it's a ripple counter, I guess we should divide that by the number of slices, so 4MHz seems like a reasonable upper bound.
Regarding configuration memory, could you have the arduino read out from a serial flash? They're pretty easy to bit bang or control over SPI, and you can get a 64Mb pretty easily.
I do prefer the idea of using EEPROM if I was going down that route, though, so it'd be more like a CPLD than an FPGA. I just need a good way to load the only bit of remaining discrete state - the output enables - on startup. My best idea thus far is to dedicate half the EEPROM to configuration data, store the latch states at address 0, and use two RC networks to create rising edges first on a register latch pin then on the highest address pin to latch in the config before enabling the EEPROM in 'operating mode'.