International Training Workshop on FPGA Design for Scientific Instrumentation and Computing November 2013
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1 International Training Workshop on FPGA Design for Scientific Instrumentation and Computing Digital CMOS Design Combinational and sequential circuits, contd. Pirouz Bazargan-Sabet Department ASIM, LIP6 University Pierre & Marie Curie (VI), 4 place Jussieu, Paris Cedex 05 France
2 Outline Digital CMOS design Boolean algebra Basic digital CMOS gates Combinational and sequential circuits Coding - Representation of numbers
3 How can I design a digital circuit? A set of gates (cell library) combinational gates memory elements
4 How can I design a digital circuit? Method to design combinational circuits Karnaugh table (local optimization) no method for global optimization synthesis tools
5 How can I design a digital circuit? Specify the circuit Combinational circuit : Boolean functions Sequential circuit?
6 Sequential Circuit transition function output function
7 How can I design a sequential circuit? I need a method to go from a black box to a white box transition function output function
8 How can I design a sequential circuit? The starting point (what I know) What the circuit is supposed to do Capture this knowledge into a representation that can be transposed into Boolean functions The aim How it will do it number of required memory elements
9 Representation of a sequential circuit? State graph = ( ) : input variables : output variables : states : transitions : output set conditions
10 = ( ) CMOS Circuits : set of transitions ( ) : source state : target state : transition condition
11 = ( ) : output set conditions ( ) : output variable : state : output set condition
12 Let consider a graph = ( ) Graphic representation of ( ) ( )
13 Representation of a sequential circuit? State graph Transpose into a graphic representation the expected behavior of a sequential system = ( )
14 Example Two signals each transmitting a series of bits (1 bit at a cycle) Design a system that sets a flag if the value transmitted by is different than
15 Example ( ) ( )
16 Representation of a sequential circuit? State graph = ( ) define the number of memory elements required to represent
17 Example ( ) ( ) 2 states 1 memory element
18 Representation of a sequential circuit? State graph = ( ) define the number of memory elements required to represent represent each state by a vector of
19 Example ( ) ( ) ( ) ( ) 2 states 1 memory element
20 Representation of a sequential circuit? State graph = ( ) define the transition function : sum of the Boolean function of the transitions that have as target a state where
21 Example ( ) ( ) ( ) ( ) ( )
22 Representation of a sequential circuit? State graph = ( ) define the output function : sum of the output conditions concerning
23 Example ( ) ( ) ( ) ( ) ( )
24 Representation of a sequential circuit? State graph = ( ) implement the Boolean functions :,
25 Example CMOS Circuits ( ) ( ) ( )
26 How can I design a sequential circuit (summary)? = ( ) graphic representation of the behavior define the number of memory elements required to represent represent each state by a vector of define the transition function define the output function implement the Boolean functions
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