Changes between Version 3 and Version 4 of HardwareInfo/video/RadeonHD_tech

Timestamp:

Oct 17, 2011, 7:35:45 PM (13 years ago)

Author:

kallisti5

Comment:

adding info on calculating PLL pixel clock

HardwareInfo/video/RadeonHD_tech

@@ -79 +79 @@
 start is a simple table like EnableCrtc.  Let me know if you have any questions.
 }}}
+
+'''Calculating phase locked loops'''
+PLL (Phase locked loop) is an electronic device to generate a programmable clock frequency. PLL computations can be *complex*... here is the simplified version which may apply to other video cards:
+{{{
+pixelClock = (pll reference frequency (xtal) * pll feedback divider) + (pll reference frequency (xtal) * pll's feedback divider decimal place ) / (pll's reference divider * post divider)
+}}}