Reverse WS2811 on an AtTiny45

Hello, I am trying to connect some rgb led's to a strip of the infamous WS2811 leds and wanted to use some AtTiny45 Avr's to decode the signal that is driving the WS2811 Led in a way that the Tinys would work just as the chip version of the WS2811 (read 24bit of data and pass the rest along until reset). I had the tinys lying around and it seemed possible since the tinys can generate 3 individual PWM signals. But now I am a little bit stuck with the coding since I never did such exact timing before. I hope anyone here can help me a bit.

Thanks, - Busti

Hmmmm ... A Pentium processor might be better suited to that task.