Author Topic: Crosstalk  (Read 367 times)

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Offline Andrew-sTopic starter

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Crosstalk
« on: June 02, 2024, 04:36:48 pm »
Hello new to the form so forgive me if answered elsewhere.
Im making a xilinx fpga Dev board i am interfacing with a single 16 bit 4gb ddr3 ic and using a 8 layer board. My question is will i have a cross talk problem if i have data and control lines routed underneath and parallel with each other if i put a gnd layer between each other i did try to eliminate it as much as possible though.
 

Offline CaptDon

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Re: Crosstalk
« Reply #1 on: June 02, 2024, 05:32:00 pm »
Perhaps the question is better asked in the FPGA or Microcomputer section? Move the question, don't cross post. I think equal impedance / length lines seem to be most important and I sometimes see resistors of around 22 ohms in series. I was told they help stop reflections. If laid out with care (I always said "It just looks right") with a ground layer in between you should be fine. After years of trouble shooting boards that have no bad components but still give random faults you can sort of visually see the difference between a well laid out board and a board done by someone who was clueless about fast high speed signal routing. 'Then the stories start!!' Cheers mate, best wishes.

Collector and repairer of vintage and not so vintage electronic gadgets and test equipment. What's the difference between a pizza and a musician? A pizza can feed a family of four!! Classically trained guitarist. Sound engineer.
 

Offline Andrew-sTopic starter

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Re: Crosstalk
« Reply #2 on: June 08, 2024, 11:18:51 pm »
thank you very much for the advise and i will move it over
 


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