Chapter 18. Digital Simulation
18.1. Digital Device Models233
18.2. Digital Circuits234
18.3. Digital Simulation Profile235
18.4. Displaying Digital Signals236
PSpice uses the same simulation engine for both analog and digital parts. Digital transistor–transistor logic (TTL) and complementary metal oxide semiconductor (CMOS) parts are modeled as subcircuits and include the common digital functions such as gates, registers, flip-flops and inverters. Within each subcircuit, a digital primitive makes up the gate function (AND, OR, etc.) and defines the timing and interface specification for the gate function. Other digital devices include delay lines, AtoD, digital to analog (DtoA), ...