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Recent content by wuchy143

  1. wuchy143

    SAE GAEIA STD 0008 Sub-Type Help

    Hi, I'm derating my board in accordance to GEIA-STD-0008 and am confusing myself with how they distinguish between sub-types. Is anyone familiar with standard and can give some real examples of what goes into Table 1 of the spec. I'm confused in how I should put my components in each...
  2. wuchy143

    Voltage Monitor - SPI Pullup?

    Hi All, I am modifying a voltage monitor matrix where they have used chip select on the part coupled with the SDATA lines to create each VMON chip to be addressable by the FPGA. I didn't write the VHDL but there is some type of state machine in the FPGA that "takes care" of this. Just want to...
  3. wuchy143

    Matlab Help

    I apologize for the delay. Dang holidays. Anyway, I attached the format of the file I want to compare to. In the beginning it is all 0000's but there is indeed data further down which I am interested in. Just so I am fully understanding, you are saying that Matlab isn't capable of reading in...
  4. wuchy143

    Matlab Help

    Hi, I am trying to manipulate a binary file(bootrom .bin file) so that I can put it into a .txt file in order to get it into the correct format to compare against another .txt file. Essentially I am trying to make the format of both files match by manipulating one. (don't ask why i'm doing...
  5. wuchy143

    Boot Rom Oddness

    I made a mistake. I actually see the strobe that never stops on the chip enable pin. I'm going to measure output enable now. Also, I will measure the resets to the processor because there is a CPLD in this chain and maybe it doesn't like the bootrom it gets and just keeps on resetting itself...
  6. wuchy143

    Boot Rom Oddness

    Hello, I am trying to figure out why a single board computer isn't booting. I am a noob when it comes to processor boards so, here we go. I haven't mentioned much about the actual board because this is more of a general processor board question. Well, I think it is :) Just looking to see if I...
  7. wuchy143

    MPC755 Processor Weirdness

    Hi, I have a single board computer I am trying to fix and it appears that the Com port on it gets slow. The data comes out but it is delayed inside the processor significantly. This only happens after a file is loaded over an Ethernet bridge on the board to the PCI bus and then to the...
  8. wuchy143

    VHDL

    Fair enough. Thank you.
  9. wuchy143

    VHDL

    Hi All, I think I'm having a bonehead moment and wanted to touch base with any FPGA guys. I'm trying to write a simple glue logic CPLD and since I've never used VHDL before I'm a little confused. My confusion rests with the following statement contained inside of "architecture" after "begin"...
  10. wuchy143

    Computer Architecture Help

    Hi All, I recently took a new job in order to challenge myself as I was bored at my job and needed a change. My first project at my new job I helped fix a DDR3 marginal timing issue with a CPU upon boot. Basically, at cold(-40C), the Real Time Operating System would not boot. So, it screamed...
  11. wuchy143

    DDR3 Clock Differential Impedance

    ah hah! that's what it was. Thanks!
  12. wuchy143

    DDR3 Clock Differential Impedance

    Awesome, thanks, makes sense. I'm looking at a designs board file and see that they did not match the length of the diff pair. There is a delta of 3 mils. For some reason I remember .001" difference in trace length will create a 1 nano second difference between the positive and negative...
  13. wuchy143

    DDR3 Clock Differential Impedance

    Thank you. Yes, what's interesting is the NXP recommendation is saying 75 to 95 ohm differential impedance. The TI says 100 ohm diff. imp. I thought there would be a standard or something. Meaning, if you are using X speed use Y diff. impedance. Sadly I'm a noob when it comes to high speed...
  14. wuchy143

    DDR3 Clock Differential Impedance

    I am trying to figure out what the differential impedance for a clock on DDR3 memory should be. The part number for the DDR3 I am referencing is W3J128M72G-1066PBI. It's a microsemi part with a 1066MB/s, so the clock is 533MHz. Exactly how should I go about calculating this?
  15. wuchy143

    Low Dropout Regulator Fries

    The -13.5V is only supplying a few op-amps as the negative supply input so I'm doubtful that the opamps are shorting positive voltage...but weirder things have happened I suppose. To be honest I don't have the data to know if it runs at least once. I may have misspoke there. But, I do know...
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