Download 100 Power Tips for FPGA Designers by Evgeni Stavinov PDF

By Evgeni Stavinov

This publication is a suite of brief articles on quite a few points of FPGA layout: synthesis, simulation, porting ASIC designs, floorplanning and timing closure, layout methodologies, functionality, quarter and tool optimizations, RTL coding, IP center choice, and so on. The e-book is meant for process architects, layout engineers, and scholars who are looking to enhance their FPGA layout talents. either amateur and pro good judgment and engineers can locate bits of beneficial info. This publication is written by way of a working towards FPGA good judgment clothier, and includes a lot of illustrations, code examples, and scripts. instead of delivering info acceptable to all FPGA owners, this booklet variation makes a speciality of Xilinx Virtex-6 and Spartan-6 FPGA households. Code examples are written in Verilog HDL. All code examples, scripts, and initiatives supplied within the publication can be found on accompanying site: http://outputlogic.com/100_fpga_power_tips

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Another example is a power-on built-in self test (BIST) circuit, which uses a clock different from the one used during a normal operation. Figure 4: Clock multiplexing It is recommended to use a dedicated clocking resource to implement clock multiplexing, to ensure that input and output clocks are using dedicated clock lines instead of general purpose logic. The input clock frequencies could be unrelated to each other. Using combinatorial logic to implement a multiplexor can generate a glitch on the clock line at the time of the switch.

Its main functions are eliminating clock insertion delay, frequency synthesis, and phase shift. DCM has a very different design than MMCM or PLL. DCM block diagram is shown in the following figure. Figure 4: DCM block diagram The control module inside the DCM compares the phases of the input clock and the feedback from the clock distribution network to estimate the delay. Then, the control module adjusts the delay between the input and output clocks using a variable delay line to achieve phase alignment.

Xilinx supports very configurable multiplier, divider, and other arithmetic cores that can be generated using CoreGen utility. 17. Mixed Use of Verilog and VHDL The need to use both Verilog and VHDL languages in the same design arises in several situations. A design team might decide for various reasons to switch to another language for the next project, while reusing some of the existing functional modules. Most often, it is the integration of a 3’rd party IP core written in a different language that results in a mixed language design.

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