VLSI Physical Design
Wednesday, September 30, 2015
Timing Exceptions
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When certain paths are not intended to operate according to the default setup/hold behavior assumed by PT, you shoulf specify those paths a...
setup and hold checks
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Notes, Assume that the flip-flops are defined in the technology library to have a minimum setup time 1.0 time units and a minimum hold ti...
Tuesday, September 29, 2015
Cell Delay and Net Delay
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Cell Delay Cell Delay is the amount of delay from input to output of a logic gate in a path. PT calculates the cell delay from delay table...
Delay Calculation
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The total delay of a path is the sum of all cell and net delays in the path. The method od delay calculation depends on if chip layout has...
Path Types
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Path Types: --Clock path ( a path from a clock input port or cell pin, through one or moew buffers or inverters, to the clock pin or a ...
timing paths
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timing paths In this figure, Each path starts at a data point, passes through some combinational logic, and ends at a data capture poin...
STA
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It is said as static because the timing information is obtain through calculation, not by simulation. STA analysis the delay of all paths...
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