I am going to use the 10MHz output of the Rubbitin frequency reference to make 50.000000000 MHz for my FPGA board. The plot is a bit...

I am going to use the 10MHz output of the Rubbitin frequency reference to make 50.000000000 MHz for my FPGA board. The plot is a bit complicated, and is planned like this: 25 MHz crystal > - FPGA board Spartan2 -> x2 DLL (delay locked loop that is a build in thing in the Spartan2 FPGA) -> 50 MHz -> divide by 5 in FPGA -> 10 MHz -> xor with 10MHz from Rubbitinn unit -> low pass -> 25MHz xta

Hi, i've worked wit 8bit/32bit microcontrollers for 5 years and now i want to explore new fields, so i'm interested in these two solutions:...

Hi, i've worked wit 8bit/32bit microcontrollers for 5 years and now i want to explore new fields, so i'm interested in these two solutions: PSoC and FPGA. I'm totally new (i don't know neither VHDL nor Verilog) and i don't understand the differences between these programmable devices. For hobby, what do you think is more useful to study? Can you suggest a low cost DevKit? Any getting starte...

Hi guys. The last time I put ddr2 on an fpga was with virtex 4 and I was able to terminate ras/cas etc internally. I want to do the same with an...

Hi guys. The last time I put ddr2 on an fpga was with virtex 4 and I was able to terminate ras/cas etc internally. I want to do the same with an artix device and I can't find any documentation except the mig user guide which says that I can't do it. Does anyone have any experience with this, it will be a single ddr so I don't need to "stub series terminate" the signals with externa

So we're doing this high speed lidar camera that I've been talking about. It has a Cyclone V system-on-module, which seems pretty nice,...

So we're doing this high speed lidar camera that I've been talking about. It has a Cyclone V system-on-module, which seems pretty nice, although I haven't gone into it very deeply. For various control and monitoring things, we need to run an I2C I/O expander using a built-in I2C PHY connected to a hard core. Because we don't have fine-grained control over the I/O voltage of the FPGA...

A test fixture uses an FPGA to stimulate a board under test and analyzed the results for testing. Once in a while, maybe after testing 300 units,...

A test fixture uses an FPGA to stimulate a board under test and analyzed the results for testing. Once in a while, maybe after testing 300 units, the FPGA gets fried. The symptom is a near short from Vcc (3.3V) to ground, often with a similar short on an I/O pin. I can't find anything that would cause this. The entire circuit is 3.3V other than a pair of RS-422 chips which ha

This is a 200 watt isolating dc/dc converter: https://www.dropbox.com/s/9k0oe2rc67mmvc1/23S941A_iso_ps.pdf?dl=0 Some idiot who shall not...

This is a 200 watt isolating dc/dc converter: https://www.dropbox.com/s/9k0oe2rc67mmvc1/23S941A_iso_ps.pdf?dl=0 Some idiot who shall not be named figured that we could start it up by ramping up the drive pulse widths from the FPGA, starting very small and eventually making square waves. But even small pulses pull hundreds of amps and have side effects like deconfiguring the FPGA. The...

There are some dynamite isolated d-s ADCs around. You give them a 20 MHz clock and they output a single clocked logic level whose duty cycle...

There are some dynamite isolated d-s ADCs around. You give them a 20 MHz clock and they output a single clocked logic level whose duty cycle expresses the analog input. The data bit is "decimated", really averaged, to give an integer analog value. That is usually done in an FPGA, with a sinc3 filter or something. I'm wondering of such an ADC can be used without an FPGA. I guess an ana...

I am still working with a friend on a TTL level replacement for some chips on a pinball board and we have a nice FPGA (MAX 10 based) but it...

I am still working with a friend on a TTL level replacement for some chips on a pinball board and we have a nice FPGA (MAX 10 based) but it wants (of course) 3.3V I/O. I was thinking that SN74CBT16211C (24 x IO level shifter) and a TVS arrays like the D3V3X8U9LP3810-7 with a low Ohm (1 - 10R) Flame-Proof 1/8W or less resistor on the outside world interface would do for protection. ...

I have a time-critical thing where the signal passes through an XC7A15 FPGA and does a fair lot of stuff inside. I measured delay vs...

I have a time-critical thing where the signal passes through an XC7A15 FPGA and does a fair lot of stuff inside. I measured delay vs some voltages: 1.8 aux no measurable DC effect 3.3 vccio no measurable DC effect 2.5 vccio ditto (key io's are LVDS in this bank) +1 core -10 ps per millivolt! If I vary the trigger frequency, I can see the delay heterodyning against the 1....

I have been working on designs of processors for FPGAs for quite a while. I have looked at the uBlaze, the picoBlaze, the NIOS, two from...

I have been working on designs of processors for FPGAs for quite a while. I have looked at the uBlaze, the picoBlaze, the NIOS, two from Lattice and any number of open source processors. Many of the open source designs were stack processors since they tend to be small and efficient in an FPGA. J1 is one I had pretty much missed until lately. It is fast and small and looks like it wa...

The pi doesn't seem to have any general counter/timer hardware, like ARMs usually do. I've seen vague references to using the GPU to...

The pi doesn't seem to have any general counter/timer hardware, like ARMs usually do. I've seen vague references to using the GPU to do timings. I'd like to measure frequencies and timestamp some edges, in the 1 us sort of domain, several channels. I guess we could hang a small FPGA off to the side if pi can't do it. Do pi's have crystal oscillators? I guess we could add one too. ...

Has anybody used the MicroZED? It looks like a good subassembly to use on a controller board. The documentation, especially on...

Has anybody used the MicroZED? It looks like a good subassembly to use on a controller board. The documentation, especially on mechanicals, is spotty. We have an upcoming project that needs a uP, FPGA, Ethernet, DRAM, all that stuff. It's tempting to buy a little board that has all that done and working, running Linux out of the box. -- John Larkin Highland Technology...

This looks interesting but I'm having trouble deciphering how it's actually supposed to work due to poor tech writing/diagramming on the part...

This looks interesting but I'm having trouble deciphering how it's actually supposed to work due to poor tech writing/diagramming on the part of the authors. Can anyone explain how this system is actually supposed to work or what a real-world FPGA implementation might look like?

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent...

We are considering sending data over CAT6 twisted-pairs, from one FPGA to another at some 10s of meters distance. It might be prudent to transformer-couple the data, to avoid ground-loop common-mode hazards, and the obvious choice would be to use RJ45 connectors with built-in Ethernet magnetics. These seem to have inductance in the 400 uH range, which gives a low-end frequency response in t...

Working on a FPGA project and we need perhaps 30 level shifter gates. Anyone work with 3.6 to 5.0 volt interfaces that can recommend any...

Working on a FPGA project and we need perhaps 30 level shifter gates. Anyone work with 3.6 to 5.0 volt interfaces that can recommend any single part over the rest before I spend a few hours digging through Digi/Mouser/Newark's inventory? In some cases we can get away with resistors, but there is a bit of TTL level drivers needed. Thanks! John :-#)# -- (Please post followups or...

This article from 2014 is Kanerva's 7-page summary of the then current state of Sparse Distributed Memory, Spatter Codes, and related...

This article from 2014 is Kanerva's 7-page summary of the then current state of Sparse Distributed Memory, Spatter Codes, and related areas, with an extensive reference list. The computational engine Kanerva describes here is something that the denizens of S.E.D. could implement in a small FPGA, should it be useful to do so. A likely use would be content-addressed memory that can tolera...

Hello everyone, my name is Raymond Chen. I am from Shenzhen, China. I am an electronic component supplier. Our main brands are Altera,...

Hello everyone, my name is Raymond Chen. I am from Shenzhen, China. I am an electronic component supplier. Our main brands are Altera, Xilinx, STMicroelectronics, Texas Instruments, Silicon Labs, Microchip, Analog Devices, NXP, Atmel, ON Semiconductor. We have all kinds of MCU, FPGA, capacitance resistance, and sensors. Please contact me with any purchasing needs. whatsapp:+8617318034...

A customer wants me to redesign a board to eliminate the production bottlenecks. They also want all IP so they can make the boards themselves if...

A customer wants me to redesign a board to eliminate the production bottlenecks. They also want all IP so they can make the boards themselves if my company is unable to. I'm fine with that, but I'd like to have some means of assurance they won't make boards without my royalty being respected. The board has an FPGA which contains the "magic", an analog path, and a digital path

Suppose I have several rackmount boxes and each has a BNC connector on the back. Each of them has an open-drain mosfet, a weak pullup, and...

Suppose I have several rackmount boxes and each has a BNC connector on the back. Each of them has an open-drain mosfet, a weak pullup, and a lowpass filtered schmitt gate back into our FPGA. I can daisy-chain several boxes with BNC cables and tees. Each box has a 40 MHz VCXO and I want to phase-lock them, or at least time-align them to always be the same within a few microseconds, l...

Greetings I have a Tek TDS694C I will be selling, and I'd like to demo it's high speed performance by showing it detecting a rise time - I'm...

Greetings I have a Tek TDS694C I will be selling, and I'd like to demo it's high speed performance by showing it detecting a rise time - I'm trying to remember exactly what that is - somewhere in picosecnd range? Is there a chip which will show a fast rise time? I believe they use some kind of high speed fpga? thanks in advance jb