July 2008
Intermediate to advanced
544 pages
16h 52m
English
Content preview from Computers as Components, 2nd Edition
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8.7 Design Example: Elevator Controller 433
System controller
Car
ctrl
Car
ctrl
Elevator
control
panels
Display
FIGURE 8.31
The networks in the elevator.
Figure 8.31 shows the set of networks we will use in the system.The floor control
panels/displays are connected along a single bus network. Each elevator car has its
own point-to-point link with the system controller.
8.7.4 Testing
The simplest way to test the controllers is to build an elevator simulator using an
FPGA. We can easily program an FPGA to simulate several elevators by keeping
registers for the current position of each elevator and using counter s to control
how often the elevators change state.