We play with technology. Sometimes we discover things we think are worth sharing.

Tag: "xilinx"

Explaining Minimum Output Delays
FPGA

Explaining Minimum Output Delays

I feel frustrated by my lack of understanding about external timing constraints, and clearly this is shared by several others.
Dynamic Function eXchange
FPGA

Dynamic Function eXchange

FPGA partial reconfiguration using a very basic demonstration design.
01 Signal Sampling
FPGA

01 Signal Sampling

Trialling an additional Low Speed I/O data ingest technique suggested by Eli Billauer.
Low Speed Serial I/O
FPGA

Low Speed Serial I/O

High speed serial I/O has been made simple to set up. It does however have a lower limit of clock speed, e.g. 300 MHz. Whilst the data rate can be lower than 300 Mb/s by using a chip select pin to negate the validity of some bits over time, that does…
Multiple Bit Pseudorandom Binary Sequence
VHDL

Multiple Bit Pseudorandom Binary Sequence

The ITU-T O.150 standard defines several methods of generating pseudorandom binary sequence meeting maximum sequences of zeros or ones.
Script to compile Xilinx Primitives with Intel's FPGA Starter edition QuestaSim
FPGA

Script to compile Xilinx Primitives with Intel's FPGA Starter edition QuestaSim

Intel's FPGA Starter edition of QuestaSim no longer compiles the primitives for Xilinx's Vivado. Here's a batch file to achieve some of the same process.
Investigating Xilinx AXI IP and Registered Outputs
FPGA

Investigating Xilinx AXI IP and Registered Outputs

Investigating Xilinx AXI IP Cores, registered outputs and the AXI specification using equivalent components for the AXI stream split and join functions.
Determining A Device's Maximum Clock Speed
FPGA

Determining A Device's Maximum Clock Speed

A proposed method for determining an FPGA device's maximum clock speed.
Doulos Clock Domain Crossing Material
VHDL

Doulos Clock Domain Crossing Material

Doulos provide two CDC solutions that were new to me, or at least variations on others I had used. So I coded them up in VHDL to try them out.