For fan 1, my version of the datasheet shows 24 MHz for bit7 = 0. (24 MHz / 1) / 256 = 93.75 kHz fan 2 matches what you have below. go figure... Jean Delvare wrote: >>But 125 kHz is a bad default (and my math and datasheet show a default >>of 24 MHz / 256 = 93.75 kHz... Khali where did you get 125 kHz?) > > >>From the datasheet ! > > Power on default [7:0] = 0000,0001 b > Bit Name Read/Write Description > 7 PWM_CLK_SEL2 Read/Write PWM 2 Input Clock Select. This bit select Fan 2 input > clock to pre-scale divider. > 0: 1 MHz > 1: 125 KHz > 6-0 PRE_SCALE2[6:0] Read/Write Fan 2 Input Clock Pre-Scale. The divider of input > clock is the number defined by pre-scale. Thus, writing > 0 transfers the input clock directly to counter. The > maximum divider is 128 (7Fh). > 01h : divider is 1 > 02h : divider is 2 > 03h : divider is 3 > > PWM frequency = (Input Clock / Pre-scale) / 256 > > > Now it seems that I read it wrong, the default would be 1MHz not 125kHz. > > Where do YOU get your 93.75 kHz from? :) >
