Philips PDIUSBD12 Cannot Poll the interrupt Register

Mar 09, 2005 4 Replies
M

Hi, I am using the Philips PDIUSBD12. I am polling the device since I cannot use the interrupt pin. The part seems to work most of the time though it occassionally gives bad IN packets during enumeration. I also can only poll the interrupt register once after enumeration to see if I am getting an OUT packet. If I poll the interrupt register after enumeration then I start sending bad or invalid IN packets, does anyone have any idea what might cause the bad packets after enumeration?



Thanks, Martin Green



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L

This chip is very buggy and a royal PITA to work with. I have written drivers for 4 different USB slave chips and this one is just horrible. But first and formost: Do you have the address/data bus timing right? It needs some very long delays (500-600 ns). See table 17 and figure 18 in the datasheet.

Leo Havmøller.

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M

Hi, Thanks for writing back. I did as you asked and checked the timing, I am using an embedded 8051, the fastest I can do anything is ~500uS and I looked at the long delays, I am well within spec. The wierd thing is that I can do all the enumeration (although I get bad packets), but if I poll the interrupt register it gets messed up.

I appreciate your response, maybe you can shed some more light on this problem.

Thanks, Martin

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W

Interesting to hear. I was just looking at the PDIUSBD11 or -12 for something. Maybe I'd better look at some more alternatives. Do you have better experiences with some other USB slave chips of this sort?

Wim Lewis , Seattle, WA, USA. PGP keyID 27F772C1
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M

Hi, unfortuneatley this is the only chip I have tried to act as an external usb device. Martin

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