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Design Constraints for digital design.

Constraints are targeted to achieve two targets : First fall into design rules limitations and other is to for design optimization.

 

 

 

 

 

Design rule constraints are provided as part of technology library and it specifies load capacitance, number of maximum load elements or fanout, maximum transition time, cell degradation etc. Link with more details.

 

Design Optimization constraints comprise of all constraints defined by designer. Some of those constraints are discussed below.  Define, master clocks, derived clocks, Input/output chip port timing delays, false paths and multi-cycle paths etc.

Syntax.
Interview Questions. Main, FPGA, Digital Fundamentals
Interview Questions. Main, FPGA, Digital Fundamentals

Constraints are derived from timing specifications of the design and it provides critical information to synthesis EDA tools to limit minimum or maximum delays for different datapath, clocks etc. on the hardware.

LTE - Long Term Evolution topics from here

5 Steps required to build a functional FPGA load (valid for most EDA flows)

How to implement a Integrated Clock Gating (ICG) cell from vendor library.

CMOS Digital Integrated Circuit design for VLSI.