Trouble configuring Virtex-5 FPGA using JTAG

Started by Syed Huq in sci.electronics.design6 years ago 1 reply

I'm trying to configure a Virtex-5 FPGA on a custom board and I'm using Xil= inx iMPACT in order to program the FPGA using a JTAG interface. But...

I'm trying to configure a Virtex-5 FPGA on a custom board and I'm using Xil= inx iMPACT in order to program the FPGA using a JTAG interface. But iMPACT = has trouble detecting the FPGA and gives an error about not being able to d= etect the FPGA even though it is powered on. I tried to program a similar b= oard and I was able to do so without any issues. The board designed is a cu= stom board...


CPU with FPGA

Started by Rick C in sci.electronics.design6 months ago

I was poking around looking for FPGA chips in packages that work optimally for me and I found a couple of new companies that are making CPUs with...

I was poking around looking for FPGA chips in packages that work optimally for me and I found a couple of new companies that are making CPUs with FPGA fabric that aren't monsters like the Zync from Xilinx in huge BGA packages. I had found the Lattice XO3D which is now available in a 72QFN with enough I/Os to get the job done, but it's a bit pricey at over $10. There are so


A simple tunable crystal oscillator

Started by Jan Panteltje in sci.electronics.design7 years ago 37 replies

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


microZed adventures

Started by John Larkin in sci.electronics.design6 years ago 47 replies

We're into this signal processing project, using a microZed/ZYNQ thing as the compute engine. After a week or so of work by an FPGA guy...

We're into this signal processing project, using a microZed/ZYNQ thing as the compute engine. After a week or so of work by an FPGA guy and a programmer, we can now actually read and write an FPGA register from a C program, and wiggle a bit on a connector pin. Amazingly, the uZed eval kit does not include a demo of this, and the default boot image does not configure the FPGA! We're u...


PCIe card with FPGA and DAC

Started by John Larkin in sci.electronics.design5 years ago 8 replies

I got a call from a really nice guy who has a tiny company in the Bahamas. Our gear is too expensive for his application, but it could be...

I got a call from a really nice guy who has a tiny company in the Bahamas. Our gear is too expensive for his application, but it could be done with a PCIe PC-plugin board that has an FPGA and a fast DAC. It would need analog bandwidth in the 30 MHz range, maybe 100M samples/sec or so. He would need help to program the FPGA, since the signal set that he needs to generate is kind of weird, ...


Low cost and/or small size CPU in an FPGA

Started by hamilton in sci.electronics.design7 years ago 10 replies

The discussion has got me to wonder, what is the lowest cost and/or the smallest CPU in an FPGA. Can a CPU with reasonable code space fit...

The discussion has got me to wonder, what is the lowest cost and/or the smallest CPU in an FPGA. Can a CPU with reasonable code space fit into a 44 pin FPGA ? Are there any 44 pin FPGAs ? hamilton


FPGA temperature measurement

Started by John Larkin in sci.electronics.design7 years ago 15 replies

We're experimenting with heat sinking an Altera Cyclone 3 FPGA. To measure actual die temperature, we built a 19-stage ring...

We're experimenting with heat sinking an Altera Cyclone 3 FPGA. To measure actual die temperature, we built a 19-stage ring oscillator, followed by a divide-by-16 ripple counter, and brought that out. The heat source is the FPGA itself: we just clocked every available flop on the chip at 250 MHz. We stuck a thinfilm thermocouple on the top of the BGA package, and here's what we got: ...


pull down on input of fpga i/o

Started by panfilero in sci.electronics.design7 years ago 3 replies

i need to interface to an fpga input, i have a 100k pull down there that gets tied to 3.3V for my logic high signal. it's been working fine, is a...

i need to interface to an fpga input, i have a 100k pull down there that gets tied to 3.3V for my logic high signal. it's been working fine, is a 100k pull down a pretty reasonable thing to do at an fpga input?


Microsoft's FPGA Translates Wikipedia in less than a Tenth of a Second

Started by rickman in sci.electronics.design4 years ago 21 replies

I found this pretty impressive. I wonder if this is why Intel bought Altera or if they are not working together on this? Ulpp! Seak and yea...

I found this pretty impressive. I wonder if this is why Intel bought Altera or if they are not working together on this? Ulpp! Seak and yea shall find.... "Microsoft is using so many FPGA the company has a direct influence over the global FPGA supply and demand. Intel executive vice president, Diane Bryant, has already stated that Microsoft is the main reason behind Intel's decisio...


FPGA config sizes

Started by John Larkin in sci.electronics.design6 months ago 27 replies

We're planning a new universal boot loader for a family of ST processors. The uP would host the loader in a bit of local flash and read an...

We're planning a new universal boot loader for a family of ST processors. The uP would host the loader in a bit of local flash and read an outboard serial flash to get the specific application code and one or more FPGA configurations. So, how many config bits might there be for a modern mid-range FPGA doing a moderately complex application? I think we could enable compression too. ...


Jtag thousands fpga

Started by Anonymous in sci.electronics.design5 years ago 10 replies

How to re/program thousands fpga at once in a short time?

How to re/program thousands fpga at once in a short time?


PSoC or FPGA?

Started by fasf in sci.electronics.design9 years ago 390 replies

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...


another PCB

Started by John Larkin in sci.electronics.design6 years ago 17 replies

This is layout iteration 18 of a new PCB layout, almost done. It's a VME module, 48 channels of isolated digital input with front-end...

This is layout iteration 18 of a new PCB layout, almost done. It's a VME module, 48 channels of isolated digital input with front-end BIST. https://dl.dropboxusercontent.com/u/53724080/PCBs/V280_18.jpg There's no uP, just some state machines in the FPGA. I like the way the FPGA looks like a crab, with claws reaching out to the circuits to the left. After The Brat had it all done, we ...


Why I ordered a raspberry PI

Started by Jan Panteltje in sci.electronics.design7 years ago 27 replies

Why I ordered a raspberry PI Things are complicatiatetered But I need to jtag FPGA board from my laptop.. This FPGA JTAG cable is for a...

Why I ordered a raspberry PI Things are complicatiatetered But I need to jtag FPGA board from my laptop.. This FPGA JTAG cable is for a parport. But raspberry PI has an IO header.. Also speed.. and via network, webpack is on yet on other PC here. The second plan: being able to record IQ signals for almost any frequency band you can think of, especially tried GPS, I was wondering if ...


the FPGA one-shot

Started by John Larkin in sci.electronics.design2 years ago 17 replies

I finally got a test case for my FPGA async one-shot idea, hacked into a build for something else. I got 17 different one-shots, with various...

I finally got a test case for my FPGA async one-shot idea, hacked into a build for something else. I got 17 different one-shots, with various pin locations and speed/drive strength settings. https://www.dropbox.com/s/4hxena27mpbpg54/FPGA_OS_1.JPG?raw=1 Most of the outputs look like this, with remarkably consistent timing, edges within a few hundred ps. This is typical: https://ww...


x86 plus FPGA

Started by John Larkin in sci.electronics.design6 years ago 9 replies

http://www.theregister.co.uk/2014/06/18/intel_fpga_custom_chip/ It sort of sounds like two chips, CPU and FPGA in a package, which doesn't...

http://www.theregister.co.uk/2014/06/18/intel_fpga_custom_chip/ It sort of sounds like two chips, CPU and FPGA in a package, which doesn't make much sense to me. https://communities.intel.com/community/itpeernetwork/datastack/blog/2014/06/18/disrupting-the-d ata-center-to-create-the-digital-services-economy Still not clear if it's one chip or two. -- John Larkin Highl


Robust configuration memory

Started by Piotr Wyderski in sci.electronics.design2 years ago 31 replies

Hello, I need a moderate amount of non-volatile memory (for FPGA configuration purposes and the like), but can't tolerate configuration...

Hello, I need a moderate amount of non-volatile memory (for FPGA configuration purposes and the like), but can't tolerate configuration errors due to charge leaks, cosmic radiation or just the malfunction of the chip. I thought that something like RAID5 imposed on memory chips/SD cards would be fine. It would be extremely simple in an FPGA, but it creates a chicken and egg problem: how ca...


delta-sigma again

Started by Anonymous in sci.electronics.design6 months ago 41 replies

I'm still playing with delta-sigma A/D conversion in LT Spice. I'll be using the ADUM7703 isolated 2nd order converter, clocked at 20...

I'm still playing with delta-sigma A/D conversion in LT Spice. I'll be using the ADUM7703 isolated 2nd order converter, clocked at 20 MHz, and we're thinking now about decimation filters in an FPGA. Win was considering using a d-s encoder and an analog recovery filter. My filter will be digital, and it will be inside a high-power control loop. The FPGA will drive a bunch of DACs at 50...


$/gate for MCU vs FPGA

Started by EnigmaPaul in sci.electronics.design7 years ago 8 replies

I am very curious about whether anyone would like to take a stable at calcu= lating the approximately dollar cost of a typical microcontroller of...

I am very curious about whether anyone would like to take a stable at calcu= lating the approximately dollar cost of a typical microcontroller of today = (say in the $5 to $10 range) in terms of $ per logic gate as compare that t= o the cost of a typical FPGA chip of today in a similar price range? You'll probably ask 'why would one want to do that?'. Well, I'm just curio= us and I thought...


FPGA one-shot

Started by John Larkin in sci.electronics.design2 years ago 47 replies

I have an async signal, call it TRIG, inside a Zynq 7020. At the rising edge of TRIG, I want to make an async one-shot. It will leave the...

I have an async signal, call it TRIG, inside a Zynq 7020. At the rising edge of TRIG, I want to make an async one-shot. It will leave the chip as RX and reset some outboard ecl logic. Anything from, say, 2 ns to 10 ns width would work. The board is built, and we can't easily add more connections to the FPGA or hack in glue logic. Well, it would be ugly. Here are some ideas: https:...