
15.5 ANALYSIS OF PULSE MODE FSMS 793
FIGURE 15.22
Analysis of the pulse mode FSM in Fig. 15.20 (contd.). (a) State diagram as deduced from the
PS/NS table in Fig. 15.21b. (b) Simulation result for 2τ
p
pulse widths indicating correct operation.
(c) Simulation result for 4τ
p
pulse widths showing malfunction of the FSM by exceeding the upper
bound for pulse width.
widths are set at 4τ
p
, causing the FSM to malfunction. Since the lower bound of permissible
pulse width is about 2τ
p
, it is obvious that pulse widths for nested cell designs of this type
must be restricted to the narrow range of 2τ
p
to 3τ
p
if malfunction is to be avoided.
The upper bound problem for ...