sequential- Circuit Models System Internally, the system generate the excitation variables, Eo to Ex, and state variables, So to Sx State Excitation Variables Variables ■ internal output M variables 0 a internal input variables X X
Combinational logic System Input Variables System output Variables I0 In O0 Om S0 Sx M0 Ex State Variables Excitation Variables MX E0 ◼ Internally, the system generate the excitation variables,E0 to Ex , and state variables, S0 to Sx . ◼ internal output variables ◼ internal input variables
sequential- Circuit Model Excitation variables Input Output (E Combinational Memory Combinational (O) transform (S) logic CLK M (9) State variables a The memory excitation input relationship can be written as D E=f(I, S) Excitation E force the memory elements to the desired state variables Output O is generated by the combinational logic transform, g), operating on input variables I and state variables s 口O=g(I,5)
◼ The memory excitation input relationship can be written as E = f( I, S ). Excitation E force the memory elements to the desired state variables. ◼ Output O is generated by the combinational logic transform, (g), operating on input variables I and state variables S. O = g( I, S ) Combinational transform (f) Memory M Combinational logic (g) Input (I) (E) CLK State variables (S) Excitation variables Output (O)
sequential- Circuit Model Excitation variables Input Output (E Combinational Memory Combinational (O) transform (S) logic CLK M (9) State variables ■E=f(工,S) ■O=g(工,5) a The clock input is not a binary value representing the time of day but rather a"synchronous"train of pulses. Synchronous memory changes its data only at certain time intervals
◼ E = f( I, S ) ◼ O = g( I, S ) ◼ The clock input is not a binary value representing the time of day, but rather a ”synchronous” train of pulses. Synchronous memory changes its data only at certain time intervals. Combinational transform (f) Memory M Combinational logic (g) Input (I) (E) CLK State variables (S) Excitation variables Output (O)