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I tried previously to simulate this with LTSpice. I modeled the PCB trace as two 100 ohm transmission lines in parallel. In the simulation, it I floated one side of the transmission line, then I got lots of reflections,etc. Connecting one with a small value inductor also showed lots of signal...
I am a HW designer. Recently a customer asked us to design an interface board that combines some high speed (250MHZ max) signals that we produce with some very low speed microcontroller circuits that they designed. The want a separate power and ground plane for their stuff and want these...
I have a Linux system using a PowerPC 405EX processor. For cost reasons, we used a 200 pin DDR2 SO_DIMM rather than solder the memory to the PCB. This has been working fine with DIMMs built using either Micron or Samsung DRAM. However, we bought some additional Crucial modules that were...
To close the issue, I did find the root cause. Problem was actually in U-BOOT. U-BOOT had two errors that masked the problem. The second rank of DDR dram was not properly enabled AND the first rank had the wrong size. This gave the unfortunate effect of making it appear that 1 GIG was...
we have a system running an AMCC 405EX processor. It has 1 GIG of DRAM and I am trying get 768MB of BigPhysArea to use for data storage. We have used this processor in a couple of other configurations. One has only 256MB and no data storage. Another has 512MB with 256MB for the OS and 256MB...
Well, I solved at least part of the mystery. The source code for the device tree that AMCC provides with their Kilauea board is WRONG. The source code should have included the line.
compatible = "amcc,usb-otg-405ex", "amcc,usb-otg";
The source code they provided on the CD that...
Anyone remember the NanoEngine by Bright Star? This was a tiny embedded system the size of a credit card. It ran a StrongArm processor, had on board Ethernet, serial port and a multiplexed address/data bus. At work, a bunch of these are headed for the trash bucket, as the product is...
I am trying to use an SMSC USB3300 under Linux 3 on a Power PC 405EX. The connection is ULPI and right now, I do not seem to be able to figure out what drivers are required. I enabled a bunch of USB stuff in the kernel. I also have the chip in the device tree and I enable the device in U-Boot...
Thanks for the tip. I converted my experimental data into a single column format as you suggested and the software loaded it fine. I am not too sure how useful this software is. I believe it expects that the data you load contains one cycle of the input waveform. It allows some choices in...
I found some FIR software at:
**broken link removed**
This appears to be free software. However, it is expecting an input file in an Agilent ASCII Tab delimited format. I have data what I captured with an ADC. I know the sampling interval. But I do not have the correct format for this...
Attached below is a picture of where I believe you should cut the foil to isolate the common node of the relay. The circle is the presently unused "B" side. Look closely at the bottom foil. The PCB designer provided an option to either have a normally closed relay or a normally open one...
There are a couple of commercial devices that can do this. However, it is not just a couple of simple components. You have to decode and reconvert the video information. I bought a cheap device to do this and was very disappointed. While it worked as advertised, the display on the TV was...
Make sure the RESET pin is not held low. Your schematic indicates that it is floating which the datasheet says is OK. However, you may want to attach a 10K pullup and verify the voltage level.
According to the datasheet, they have a MPROG utility that can write the internal EEPROM. You may...
The first thing to try is to get the same receiver IC as used on the slave end and parallel it across the twisted pair cable. This sort of SPY connection often works. To minimize the effects of reflections, it is best to make the parallel tap at the slave or receiving end.
When adding this...
I have a new design that uses lots of power MOSFETs as linear regulators. The MOSFETs are a powerpak8 package that are optimized for dumping their heat into the PCB. The problem is that I am forced to have 32 of these circuits and each can handle up to 3.5A. This dumps lots of heat into the...
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