cpld needs a external Oscillator ?

[Altera_Forum]

i use cpld as combinational logic.the circuits don't need Oscillator.so if i don't connect a external Oscillator to cpld,can it work normally? 

moreover,can internal oscillator be used as general clock?

[Altera_Forum]

As long as you do not use registers like a DFF, you do not need any clock. 

But be aware that using pure combinatorial logic output could mean that there are glitches or spikes due to different combinatorial delays.  I assume you talk about the MaxII device, then have a look at page 42 (http://www.altera.com/literature/hb/max2/max2_mii5v1.pdf) it should be possible to use the internal oscilator.