Scripting Magic

1. Random Number generation using Make file:

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          RANDOM := $(shell /bin/bash -c "echo $$RANDOM")

          test:
                         echo $(RANDOM)
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Linux type below:
> make test
echo 5184

5184

         

IR Drop

• IR Drop is related to voltage drop in power distribution interconnects in a chip which can be static or dynamic or both. This drop can reduce supply voltage reaching to the standard cell. So standard cell may not work perfectly.
• Static IR Drop:
• Static IR drop are drop in VDD voltage level caused by resistance of wire metal used in power distribution.
• In other words it is the drop due to current flow through the interconnects wires when circuit is at steady state. e.g. no inputs are switching.
• The factor affecting the static IR drop are basically the dimension of power rails, width, via, power switch sizes etc..
• Dynamic IR Drop:
• Dynamic IR drop refers to the voltage drop in VDD due