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Page for Kirk's Verilog Lecture Series

Test VCD file - use this to test your standalone waveform viewer, such as GTKwave. This file is not needed if you are using Veritak or ModelSim since they have there own built in waveform viewers. For those of you using ModelSim or Veritak, as an exercise, I'd like you to discover whether you can or can't display this VCD file. Please telll me your findings.

ozyjanus_sim.vcd - this is a simulation I did the other day of a new version of ozyjanus.v and other files for the Ozy FPGA.

Verilog Simulators

Free versions

[1]Icarus Verilog simulator - If you are using Windows try this link instead

ModelSim - Altera Starter Edition 6.4a for Windows - Windows�Vista (32-bit), and Windows XP (32-bit)

ModelSim -Altera Starter Edition 6.4a for Linux - Red Hat Linux Enterprise 4/5, SUSE Linux Enterprise 9 (32-bit)

This Quck Setup.txt short text file may help you get going on ModeSim 6.3g. I suggest you also read ModelSims tutorial. Let me know if you have any problems or if I wrote something unclear or wrong.

Verilog Simulator & Waveform viewer

Veritak : Verilog HDL Compiler/Simulator supporting major Verilog 2001 HDL features. It is integral environment including VHDL to Verilog translator, syntax highlight editor (Veripad), class hierarchy viewer, multiple waveform viewer, source analyzer, and more --available for Windows XP/2000. If you are looking for fast verilog HDL simulator with very good GUI, woth an inexpensive price ($50), this is it. You can try Veritak for free for two weeks.

Free VCD Waveform Viewers

[2]I recommend the GTKwave waveform viewer.

GTKwave3_1_6.rar along with an installation/tutorial video GTKwaveTutorial.rar will show you how to install and run on Windows. Demo was on Win XP. You will also need to download the Test VCD file mentioned above

GTKwave links - - for other OS.

Synapticad's free WaveViewer for Windows - - this also installs a bunch of other software that may/may not be usable.

Altera Quartus

Altera Quartus Lecture March 16, 2009 Video in MP4 format, 1280 by 960 resolution, 160MB (1hr 45min). Lecture about using Altera Quartus tools and a new Mercury and Ozy design in progress using NWire. See the Merc_Ozy_test.rar.

Altera Quartus Lecture March 16, 2009 Video in WMV format, 1280 by 960 resolution, 110MB (1hr 45min).

Ozy, Mercury Software Handshaking

Handshake_CDC_OzyMercuryOverview_MP4.rar March 19, 2009 Video in MP4 format, 1280 by 960, 126MB (1hr 32 min). Lecture about using handshake logic with respect to CDC and metastability issues, overview of Ozy and some Mercury code and how they communicate using the NWire modules. Brief discussion on data format/blocks of data between PowerSDR and Ozy's TX & RX FIFOs

Handshake_CDC_OzyMercuryOverview_WMV.rar March 19, 2009 Video in WMV format, 1280 by 960, 124MB (1hr 32 min).

Mar 20 2009.rar HPSDR Mar 20 2009. Code using NWire for Ozy, Mercury and Penelope. The projects for each have been updated to work with the Altera Quartus 9.0 tools which I will use from now on. The Ozy project now includes sim.v and Try to get sim.v running by including all the necessary files in your simulator. Note that there are 3 Altera megafunctions. If your simulator can't include these then please try the new ModelSim - Altera Starter Edition v6.4a. I posted a new link near the beginning of this webpage for both a Windows version and a Linux version of ModelSim. The is a file containing some of the simulation signals to help get you started if you are using ModelSim.

Mar 21 2009.rar HPSDR Mar 21 2009 Here is a picture reported by Phil Harman VK6APH and another reported by Rick Hambly W2GPS showing a bug (spurs) in the audio of the Mar 20 code. In this release I have fixed the bug. I would like for you to try to find the bug and will discuss how to go about it in the Mon. Mar 23 webinar. So please dont look at the new code changes in Tx_fifo_ctrl.v - your first clue as to where the bug is located. See if you can first get the Mar 20 code running, like Rick and Phil did, and verify the bug. Then try to find and fix the bug in Tx_fifo_ctrl.v in the Ozy FPGA. If you need more clues, email me This is a good exercise for what you have learned so far. Script for those using ModelSim to create/compile various Altera libraries for use in simulation. Only needs to be run once after setting up a ModelSim project. My script uses these.

Ozy_USB_interface_1280x960_MP4.rar Mar 23, 2009 Video in MP4 format, 1280 x 960 resolution, 151MB (1hr 38min) Ozy_USB_interface_1280x960_WMV.rar Mar 23, 2009 Video in WMV format, 1280 x 960 resolution, 140MB (1hr 38min)

MercuryReceiver.ppt Powerpoint slides used in Mar 26 Mercury Receiver lecture presentation by Kirk Weedman

CIC filters & Mercury Reciever Mar 26 2009, WMV format, 91MB, approx 1hr 32min. CIC lecture by Michael Kreeger and Mercury Receiver lecture by Kirk Weedman. Recorded by Michael Kreeger.

CIC filters & Mercury Reciever Mar 26 2009, MP4 format, 72MB, approx 1hr 27min. CIC lecture by Michael Kreeger & Mercury Receiver lecture by Kirk Weedman. Mar 26 2009, MP4 format recorded by Kirk Weedman. This recording missed some talking between lectures as my computer had to reboot due to a GoToMeeting problem.

Test.rar CORDIC Test Simple simulation setup for testing cordic.v and kordic.v as shown in the April 8, 2009 webinar. I would like users to test the difference of these two in Mercury and see if they can notice any difference in the quality. Look at Mercury's receiver.v module and search for cordic & kordic and you should see how to use one vs the other.

Note: April 8, 2009 CORDIC webinar: I did not explain something in the kordic.v code that I should have. There are several equations in Stage 0 that are of the following format:

X[0] <= {Xin[WI-1], Xin} << (EXTRA_BITS-1); // since An = 1.647, divide input by 2 and then multiply by 2^EXTRA_BITS
Y[0] <= {Yin[WI-1], Yin} << (EXTRA_BITS-1);

I told you that we divide by 2 then multiply by 2^EXTRA_BITS but I didnt tell you WHY we divide by 2. Notice that the overal gain due to the CORIDC iterative process where the Ki's are removed from each iteration gives us an overall gain of 1.647. Therefore to get the gain back to unity we should multiply by 1/1.647 = .6073. This implementation in kordic.v as well as that of cordic.v takes a simplistic approach and multiples by 1/2 = .5. Not the ideal .6073, but OK. We could get closer to unity by doing something like 1/2+1/16+1/32 = .59375 or maybe something even better.

CORDIC Apr 8, 2009, MP4 format, 82MB, approx 1hr 32min. Presentation of CORDIC theory, specifically created a function to do SIN() and COS() multiplication, implementation code in Verilog and simulation. Also how a cordic is used in the Mercury receiver.

CORDIC Apr 8, 2009, WMV format, 117MB, approx 1hr 32min.

Apr 13 2009.rar HPSDR Apr 13 2009 Latest test code release. Changes to bus signals due to addition of more code to support Janus in the Ozy FPGA. See MPOJ.ppt for a diagram of many of the bus data transfer signals. Changes to project files to help reduce timing analysis warnings and errors. Misc. code cleanup.

CDC_Penelope_MP4 April 15 2009 MP4 format, 125MB, approx. 1 hr 45 min. Presentation on communication between Mercury, Penelope, Ozy and Janus, CDC design issues for slow to fast and fast to slow clock domain crossing. Overview and selected discussion of Penelope modules.

MPOJ.ppt Block diagram of NWire and I2S communications across the Atlas Bus as shown in the CDC_Penelope webinar

sim.v Latet Ozy_Janus test file.

For now this is the end of the main lectures. I appreciate everyone atending and hope you have a better understanding of Verilog and how you can use it. Also thanks to those that gave feedback. We can still have a webinar every once in a while as the need arises.

Kirk Weedman KD7IRS