PCI CARD Design Question.

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I already made this question at FPGA forum as it is going to be a FPGA board but i think this forum might be better suited for my question.

Is it mandatory to use 2 powerplanes on a PCI Card or, if i can route everything using just 2 layers, i wont have any problem?

Is there any specific lenght i must match other than the clock line size(and max IO lenght)

Any other promlem i must pay attention?

Thank you!

 

[bert_kak]

I already made this question at FPGA forum as it is going to be a FPGA board but i think this forum might be better suited for my question.

Is it mandatory to use 2 powerplanes on a PCI Card or, if i can route everything using just 2 layers, i wont have any problem?

Is there any specific lenght i must match other than the clock line size(and max IO lenght)

Any other promlem i must pay attention?

Thank you!

At above 10-15MHz, multi layer board should be considered because multi layered boards using ground & power planes provide significant reduction in radiated emission over two layer PCB. Also the ground plane reduces ground impedance thus reducing the ground noise.

 

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But there are a few cheap Network cards with double layer only.. i know using 2 power planes would be the a good pratice, but for now i just need a very low cost PCI board.. it is just a intermediate design. The final one is going to be a PCI/104 board, but as i do not have the PC/104+ CPU i need to design one for a common PC. The price to make a 4 layers card is 80% higher. Do you think i might have serious problem with double layer? Or it should work? If it does not work i am going for the 4 layers one... but i just dont want to waste money as this card is goingto be useless when i get the final one.

Thank you!

 

[bert_kak]

But there are a few cheap Network cards with double layer only.. i know using 2 power planes would be the a good pratice, but for now i just need a very low cost PCI board.. it is just a intermediate design. The final one is going to be a PCI/104 board, but as i do not have the PC/104+ CPU i need to design one for a common PC. The price to make a 4 layers card is 80% higher. Do you think i might have serious problem with double layer? Or it should work? If it does not work i am going for the 4 layers one... but i just dont want to waste money as this card is goingto be useless when i get the final one.

Thank you!

It will still work on two layers. just put a copper pour on the whole board (top & bottom) and add many stitching ground via's to increase protection for EMI.

 

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Thank you very much!! I am taking your advice in account!

Cya