AVR-Chat

warning:signature does not match selected device


i have the next problem..i have the avr studio last
new version.and my avrisp with v2 firmware....

i cant program the chips that i want to
burn....(AT90s1200) and (at90s2313)

in the program in advanced option i try to read the
signature and it displays
0x00 0x00 0x00 
and warning:signtature does not match selected
device..

and i cant erase,program the chips...

what is the problem??help me please..

thank you.for your help..

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