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改造小黑,从PM1.5G到1.99G

小黑的芯是一颗DOTHAN PM1.5G,pll chip是ics950810.根据其datasheet的描述,只要将fs1拉高,即可将fsb从100提高到133.于是可以将fs1悬空,这时候可以看作是输入端接一个无穷大的电阻,相当于输入端接高电平.这样PM1.5G就成了1.5-133=1.995G.但是有个问题,DDR266的条子能否承受这个频率就成了问题,因为他需要接收266*1.33=353M的考验,板载的条子是DDR333的,应该问题不会太大.

http://www.9652.org/blog/wp-content/f2/attachments/200605/16_134332_pll.jpg
http://www.9652.org/blog/wp-content/f2/attachments/200605/16_134343_datasheet.jpg
http://www.9652.org/blog/wp-content/f2/attachments/200605/16_134352_fun.jpg

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