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Recent content by engr.waqas

  1. E

    PCIe lanes confusion

    Considering the following scenario: A designer wants to connect 3 devices on a PCIe x4 finger edge connector, commonly found on mother boards. All 3 devices will be populated on the same PCIe card. One device has 1 port of 2 lanes i.e (1 x2 PCIe port) Remaining two devices have 1 port of 1 lane...
  2. E

    Issue with TFTP ....retry count exceeded

    My already has bootloader (U-Boot) and linux kernel installed. I'm trying to download kernel again to the board for learning purpose. But I'm getting the error tftp retry count exceeded starting again is it due to the fact that my board already has a linux kernel? if not then any idea how to...
  3. E

    Porting linux kernal over an existing kernal image

    My already has bootloader (U-Boot) and linux kernel installed. I'm trying to download kernel again to the board for learning purpose. But I'm getting the error tftp retry count exceeded starting again is it due to the fact that my board already has a linux kernel? if not then any idea how to...
  4. E

    Installing TFTP server

    I'm installing a TFTP server on Ubuntu. I have read many tutorials on this but I'm stuck on following step found on all tutorials. Create /etc/xinetd.d/tftp and put this entry: service tftp { protocol = udp socket_type = dgram wait = yes user = root server...
  5. E

    Re-locating Microchip C30 library assembly code

    I am working on a PIC24F bootloader . I want to keep the flash(MCU's internal memory) erase and write functions in the bootloader section so they don't get erased or affected with the rest of the code. I am using Microchip C30 built-in library functions. How can I add assembly source files...
  6. E

    SPI based flash memory interface issue

    I am using a SPI flash memory, AT25DF021, with PIC24FJ64GB004 microcontroller. I am using the following C30 SPI library code (OpenSPI1()) and configuration to initiate the SPI peripheral of MCU. I have remapped the correct MCU pins for SPI peripheral (using C30's PPS library). I later use...
  7. E

    how to integrate this ?

    The accepted right answer is (1-cos(2000 * PI * t))/(C*2000 * PI) But I dont know from where it came ? :) can someone tell me?
  8. E

    Basic circuit analysis question

    Thanks for reply. But any hint to make equations?
  9. E

    Basic circuit analysis question

    Please see attached question . Please help how to solve that and what is answer?
  10. E

    how to integrate this ?

    My answer is -cos (2000 * PI * t ) / (2 * PI ) + C which is again wrong :( but I'm sure it is very close to true answer
  11. E

    how to integrate this ?

    I don't know the answer :) I am simply putting my answers in a software which is indicating answer is wrong .
  12. E

    how to integrate this ?

    There is some error in this because the answer is not being accepted by system. also the link you told does not cover my case :(
  13. E

    how to integrate this ?

    Hi Mr.goldsmith I am doing an online course where I have to find this integration, the issue is after so many professional years of job , I don't remember integration rules :)
  14. E

    how to integrate this ?

    Please see attached picture. where C=0.001 and i(t)= sin(1000 * 2 PI t ) also i(t)=0 for t<=0
  15. E

    How many Joules are there ??

    your answer is right but why another multiply by 1000 is not there due to 1 dietitian's calorie is 1000 physicist's calories ?
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