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Recent content by eehadi

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    Q: Which layers are required for PCB manufacturing?

    Hi. I have a multi-layer pcb file in allegro and I want to give gerber file to manufacturer to produce pcb. Which layers' gerber file must be generated? (minimum layers for a complete pcb with drilling, silk screens, defined layer thickness, ...) Which information are not in pcb file and I must...
  2. E

    Problem: Can't receive RS485 by more than one receiver

    There are termination resistors in boards and cables are balanced but ground of the farther device is isolated, I hope connecting grounds solves the problem. Is ground wire necessary? Is OK that I connect ground of all circuit directly to each other?
  3. E

    Problem: Can't receive RS485 by more than one receiver

    Hi. I have a problem using RS485. I can transmit data using RS485 (ISL83485 IC) and receive it while only one receiver is connected, but when I connect both receivers, I can't receive data correctly in the farther device (located about 2 meter far from sender). Am I wrong about connecting more...
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    Strange problem in the pcb

    Hi. I have a Spartan 3 50AN FPGA on my board. Sometimes when I turn on power supply, FPGA doesn't start untill digital input would change or I hit a conductor e.g GND on board by oscope or multimeter probe. I have no idea why this happens.
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    FPGA overheat and not working problem

    Thanks. I will test the board for detects tomorrow. what type of defects in PCB can make this problem? There is 7 LEDs connected to FPGA ports, I think I can calculate LED current by measuring series resistor voltage drop. I wanted a minimum size board so I didn't use transistor to drive LEDs...
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    FPGA overheat and not working problem

    Thanks. the power supply current indicator is not such accurate but it showed 0.1 when there was no problem and it shows 0.3~0.5 A now and FPGA overheats. how can I measure LEDs current while they're placed in board? LEDs are connected to FPGA pins through a 100 ohm resistor. if pins are...
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    FPGA overheat and not working problem

    Hi, I have a new PCB includes a Spartan 3 FPGA, it worked well first day, then it had probably a connection problem that sometimes didn't work but when I moved board inside case or push some places on it, it ran again, in that case indicator LEDs were counting, stopped by fault but kept their...
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    Q: has ModelSim wave window hide/collapse/grouping facility?

    Hi. I want add lots of waveforms to ModelSim SE wave window, but I need most of them only in some cases and I don't want see them always in wave window, is there any capability in ModelSim to hide/collapse/group waveforms to view all important waveforms without scrolling?
  9. E

    CAN interview questions

    what is the difference between standard and extended versions of CAN in practice?
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