Index 507
U
UART, see Universal Asynchronous
Receiver/Transmitter
UML, see Unified Modeling Language
Unified cache, 119, 488
Unified Modeling Language
(UML), 488
diagram types
class diagram, 471
collaboration diagram, 473
overview, 469–470
sequence diagram, 473
state diagram, 471–472
generalization, 25–26
model train controller example
conceptual specification, 34–37
detailed specification, 37–44
Digital Command Control standard,
32–34
overview, 30
requirements, 31–32
notation, 22–24
object-oriented design, 21–22
primitive elements, 469–470
signals, 329–330
Universal Asynchronous Receiver/Transmitter
(UART), 92–93, 488
Universal Serial Bus (USB), 488
Unrolled schedule, 304, 488
Usage scenario, 464, 488
USB, see Universal Serial Bus
User Datagram Protocol, 418
User mode, 111,