Combining PCIe and Gigabit Transceiver on Cyclone V

Overview The goal: Using one of the PCIe transceivers for something else on a Cyclone V GT FPGA Development Kit Board, while keeping the PCIe link (narrowing it down from 4x to 2x). This allows allocating some other logic to the transceiver that goes to the PCIe finger, and do the bifurcation with a PCIe [...]

QDB vs. QXP, Quartus Pro vs. Standard: Post-synthesis packaging of an IP core

Introduction It’s often desired to package an piece of FPGA logic in a post-synthesis (netlist) format for later use in another project. IP core vendors often deliver their products as netlists, partly to protect themselves from unauthorized copying and use, and partly to ensure that possible bugs in the end-user’s synthesizer don’t influence the product [...]

Using Verilog “initial” blocks for FPGA synthesis: Legit? Portable?

Introduction Ask an VLSI engineer if the Verilog “initial” keyword is legit for synthesis, and flames of fury will go your way. However in the FPGA world, it’s a portable way to assign registers and array with the initial (and possibly constant) values immediately after configuration. The main argument against this practice is that a [...]

HTG’s USB 3.0 FMC module: Things you surely want to know

Introduction I purchased a HiTech Global 3-Port USB 3.0 SuperSpeed FMC Module (also known as USB3 FMC), which is an FPGA Mezzanine Card, primarily based upon TI’s SuperSpeed USB 3.0 Transceiver, TUSB1310A. Even though this board works fine at the end of the day, my experience with it was full with surprises, not all of [...]

Power supply parameters of Xilinx’ KC705 board, obtained via PMBus

What’s this? This is a dump of some parameters of the three power supplies on the KC705 board. More precisely, these are the outputs of the “getvals” utility, which is published on this post, running with the FPGA design published on this post. The control of these power supplies is discussed in another post of [...]

Example C sources for controlling a power supply with PMBus

Overview This post is best read after another post of mine, “Controlling the power supplies on a Xilinx KC705 FPGA board with PMBus“. This C code assumes that the FPGA is loaded with the design published in this post. These are the sources of utilities I wrote to fetch parameters and update the VADJ voltage [...]

FPGA source code for a PMBus master on Xilinx KC705

Introduction This post is best read after another post of mine, “Controlling the power supplies on a Xilinx KC705 FPGA board with PMBus“. C utilities for using the design outlined below can be found in another post of mine. These are the sources for allowing a computer to monitor and control the power supplies of [...]

Controlling the power supplies on a Xilinx KC705 FPGA board with PMBus

You probably don’t want to read all of this First of all: There is a GUI tool offered by TI to monitor and control its power controller. In hindsight, I have to admit it’s probably the quick & painless way to modify the voltage of a power rail (see last post on this page). I [...]

The pin assignment of an FMC connector in CSV format

As the title says: These are the labels of an HPC (High Pin Count) FMC connector, in plain CSV format for easy handling. It was a bit odd to me that I didn’t find this info on the web myself. Just copy-paste: A1,GND A2,DP1_M2C_P A3,DP1_M2C_N A4,GND A5,GND A6,DP2_M2C_P A7,DP2_M2C_N A8,GND A9,GND A10,DP3_M2C_P A11,DP3_M2C_N A12,GND A13,GND [...]

Gtkwave notes

General Gtkwave is a simple and convenient viewer of electronic waveforms. It’s a free software tool at its best: A bit rough to start working with, but after a while it becomes clear that the decisions have been made by someone who uses the tool himself. Really recommended. So here are my jumpstart notes for [...]