https://sourceforge.net/p/linuxwmt/wiki/PLLs/Recent changes to PLLsenSat, 20 Apr 2013 18:37:38 -0000https://sourceforge.net/p/linuxwmt/wiki/PLLs/<div class="markdown_content"><pre>--- v1 +++ v2 @@ -15,7 +15,7 @@ To calculate the PLL frequency on the WM8505, use the following formula: -*pre_div = (reg_val & 0x100) ? 2 : 1* +*pre_div = (reg_val & 0x100) ? 1 : 2* *freq = (OSC / pre_div) * (reg_val & 0x1F)* @@ -32,3 +32,33 @@ To calculate the PLL frequency on the WM8650, use the following formula: *freq = (OSC * (reg_val & 0x3FF)) / (((reg_val >> 10) & 7) * ((1 << ((reg_val >> 13) & 3)))* + + +WM8750 +------ + +bits|function +----|-------- +31:24|Filter +23:16|Multiplier +8|Divider +2:0|Shifted Divider + +To calculate the PLL frequency on the WM8750, use the following formula: + +*freq = (OSC * ((reg_val >> 16) & 0xFF)) / ((((reg_val >> 8) & 1) + 1) * (1 << (reg_val & 7)))* + + +WM8850 +------ + +bits|function +----|-------- +31:23|Reserved (always write 0) +22:16|Multiplier +8|Divider +2:0|Shifted Divider + +To calculate the PLL frequency on the WM8850, use the following formula: + +*freq = (OSC * 2 * (((reg_val >> 16) & 0xFF) + 1)) / ((((reg_val >> 8) & 1) + 1) * (1 << (reg_val & 7)))* </pre> </div>Tony PriskSat, 20 Apr 2013 18:37:38 -0000https://sourceforge.net0f14be1a02fc4f8e28266ecb4d55ee338cecd270https://sourceforge.net/p/linuxwmt/wiki/PLLs/PLL's ===== Wondermedia processors have several PLL's driven from an oscillator. These provide clocks for the arm processor, ahb bus and peripherals. WM8505 ------ bits|function ----|-------- 19:18|VCO Range Value bits (always write 0) 17:16|Charge-pump Range Value bits (always write 0) 8|Pre-Divisor Bypass (0=divide by 2, 1=bypass) 4:0|Multiplier (0..3 = bypass, otherwise value*2) To calculate the PLL frequency on the WM8505, use the following formula: *pre_div = (reg_val & 0x100) ? 2 : 1* *freq = (OSC / pre_div) * (reg_val & 0x1F)* WM8650 ------ bits|function ----|-------- 14:13|Shifted Divider 12:10|Divider 9:0|Multiplier (unknown which values are invalid) To calculate the PLL frequency on the WM8650, use the following formula: *freq = (OSC * (reg_val & 0x3FF)) / (((reg_val >> 10) & 7) * ((1 << ((reg_val >> 13) & 3)))*Tony PriskThu, 05 Jul 2012 21:52:05 -0000https://sourceforge.netac7071e472b607467f5d31a1bb07e839741fe913