random_cat

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  1. random_cat

    Advice for workstation configuration

    Thank you. I think it's a good forum to ask that because here are a lot of vivado users. This application, from what I was able to understand from here and other forums, does use a PC in a particular way, very different than games or other apps. It is not necessary hungry for zillion of cores, 4-6 looks more than enough, especially with hyperthreading. But it does use the memory a lot, and huge memory, with as higher as possible bandwidth, may be more important than 100-200 mhz difference in clock. I have seen, on other forums, some comparisons between different machines, doing similar jobs. On one discussion, an i7-5775C was credited with significantly better performance than similar cpu's just because it has 128meg of eDRAM cache embedded near the cpu. Actually those 128 meg of memory were dedicated for the gpu, but when the gpu core is disabled, edram becomes available as l4 cache for the main cpu. On other discussion, I saw an AMD cpu performing slower (synthesis and implementation) than a similar i7 cpu, even if the cpu clock of amd was 100-200 mhz above i7. This is why I tried to find the highest memory performance I can afford. Maximum memory channels for main ddr4 (4 channels) and biggest cache I can afford. Just I can't say which cache is better, more l2 per cpu or more l3 global.
  2. random_cat

    Arty Z7-20 HDMI pass through

    Thank you. I've managed to make it work with the adding of a video timing generator. Otherwise, it supports 200mhz clock for dvi2rgb, all other clocks are now connected to pixelclk.
  3. random_cat

    Advice for workstation configuration

    Thank you all very much for your advice. Unfortunately, for me, a high end laptop is not an option right now. I will add one more question. During my research for the configuration of the desktop workstation, I narrowed down the choices of the CPU to two affordable choices for me:: -i7-6800K, 3.4Ghz clock, 6x256k L2 cache, 15M L3 cache -i7-7800X, 3.5Ghz clock, 6x1M L2 cache, 8.25M L3 cache The system will have quad channel 32gb of ddr4 ram, probably at 2400mhz Which one would you choose for vivado workstation?
  4. random_cat

    Advice for workstation configuration

    Hi all, I need a bit of advice regarding my workstation configuration. Currently I am using an i7-q820 based laptop with 8g ram, with vivado, to work with an arty z7-20 and artix video boards. In the future, maybe I will purchase also a ZCU102. Now I am at beginning with everything, but designs already takes a lot of time to synthesize on my laptop. I am planning to purchase a more powerful PC, but desktop, not laptop, and to install there vivado and everything needed to work. Due to various reasons, it is much easier for me to install that desktop pc into a part of the house which is mostly a storage room, and to connect it to the internal ethernet network, without monitor/keyboard. For flexibility reasons, I would like to continue using laptop as a remote desktop station to control the desktop pc (with teamviewer etc.). However, there is a problem. I need the fpga boards near me and those has to be connected to usb-jtag with the desktop pc, not with the laptop, which is just the remote desktop station. Any idea how to do that? Is there any usb-to-usb bridge over ethernet? Thank you.
  5. random_cat

    Arty Z7-20 HDMI pass through

    Hi all, I am trying to make a simple hdmi pass through between hdmi in and hdmi out with Arty Z7-20 board. Attached is my design block. The problem is it does not work, regardless of video resolution, I tried from 800x600 up to full hd. Any idea why? On a previous design, without axi converters, just dvi2rgb connected to rgb2dvi, it works, hdmi signal passes through. clk_out1 is 200mhz, both axi interfaces works in independent clock mode and dvi2rgb outputs valid signal, I have a lock signal at output. Thank you.