--- In avrclub@avrc..., "gronganjana <raistlin@i...>" <raistlin@i...> wrote: > I'm using an AT45DB011B serial DataFlash from atmel. In the datasheet > I cannot find any information on the maximum number of flash writes > that can be made to the chip. Do any of you have information on this. A related question is interfacing with the DataFlash. Since it's a 3.6V max device with 5V tolerant inputs, going from a 5V AVR *to* the DataFlash is fine. It's going from Dataflash to AVR that gets sticky. For example, the DataFlash claims a Voh (Output High Voltage) of min Vcc-0.2V, or about 3.4V at most. The Mega8 has a Vih (Input High Voltage) of 0.7*VCC, or 3.5V min. Won't work as far as I can see. Have to use a transistor to switch on/off the MISO line ? Dean.

This part is very different from the usual flash that is part of the AVR CPU. The specification (see app note) is that memory is good for 10,000 erase/write cycles OF OTHER LOCATIONS. You must read and rewrite a memory block every 10,000 erase/write cycles. Thus there is NO specified maximum number of write cycles before the part may fail but instead a requirement that you rewrite (and thus refresh) all memory locations at least every 10,000 E/W cycles. Andy

gronganjana wrote: >I'm using an AT45DB011B serial DataFlash from atmel. In the datasheet >I cannot find any information on the maximum number of flash writes >that can be made to the chip. Do any of you have information on this. > > >Jardar > > >To unsubscribe from this group, send an email to: >avrclub-unsubscribe@avrc... > >">http://docs.yahoo.com/info/terms/ > > Not for this particular ic, but normally we expect the reprogrammability of flash is minimum 1000 times. prasad

I'm using an AT45DB011B serial DataFlash from atmel. In the datasheet I cannot find any information on the maximum number of flash writes that can be made to the chip. Do any of you have information on this. Jardar