irda problem

Hi, i'm trying to implement an IR interface with FPGA altera de2, cyclone ii.

the IRDA ic is hsdl-3201.

after looking with osciloscope, i realized that ir signal is modulated by 38khz pulse (with D.C about 90%)

so i have built a clock with frequency ~38khz , so sampling at this rate to generate demodulated signal.

after that, try to read the trasmit data and count the time the signal is high and low. it doesn't work

and i guess there's something basic i don't do /understand.

could someone advice plz.