Hi, I'm using an Atmel 8051 derivative without a built-in global checksum read ability. I would like to write my own global checksum function that would execute at startup and store the result in RAM (later being transmitted to the PC terminal). Couple questions:

1) Is a 32-bit CRC the typical checksum format used for something like this?
2) For something like a 64k part, how long does this typically take to execute? IE: With a decent derivative (2-6 clks\cycle) at, say 10Mhz, could this execute in under a second or two?

Thanks,
James