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阅读：1378回复：4
SL811HS operation crystal.....
if SL811HS want connect Full-speed device, the operation crystall is \"must\" use 48MHZ? or use 12MHZ also can connect Full-speed device?
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沙发#
发布于：2003-01-20 14:05
I am using sl811 with 12MHz crystal now and connecting with usb disk in full speed.But sometimes there are some instable problems.48MHz crystall is better!
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板凳#
发布于：2003-01-20 14:27
i set 0x05=0x05,0x06=0x61,0x0e=0xe0,0x0f=0xae,and 0x00=0x87 or 0x83, it\'s right? or have other set? it\'s device respond 0x04(timeout), is timeing problem?(i use 89c52 24MHZ) :(
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地板#
发布于：2003-01-20 15:15
first you may read int status reg to determine device detect. then set some \"sof\" regs.0x0e=0xe0,0x0f=0xae is right.then set 0x00=5,meaning is setup 48Mhz and SOF enable.
then set 0x3=0x50,0x04=0x00,0x00=0x01(start generate SOF or EOP). You may be have cypress firmware example.Please read it carefully.Good luck ! |
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地下室#
发布于：2003-01-20 20:25
Thank you very much,lxb_gd
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