×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Need help on PCI board.

Need help on PCI board.

Need help on PCI board.

(OP)
Hello folks, I recently designed a 3.3V 33Mhz PCI I/O board without PnP support. This is actually my first experience with PCI interface so I was expecting troubles. The current trouble is that once I install the card into the slot, the computer cannot be turned on, or the power supply simply locks itself down. I am pluging the card into a 5V-PCI slot using Universal keyslot.
I suspect that there was a voltage mismatch so the motherboard didn't pass the startup test. Does anyone have any idea on what's the problem? And how to solve it?
Thanks!!!

Heibear

RE: Need help on PCI board.

Well, if your 3.3V card can not undertake 5-volt signals, it means that the 5-volt signals on the PCI bus are getting shorted to the 3.3V rail when they are driving a high.  This may overdrive the PCI interface chips.

But if the power supply does not even start, then it may be something more serious.  Like a short on power supply lines. Verify that something stupid hasn't been done, like mistaking side A and B.

RE: Need help on PCI board.

On a PC, the power supply won't start unless its RST\ input is allowed to go high.  

Check pin position 15, side B on your board.  



Mike Halloran
Pembroke Pines, FL, USA

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources