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Chapter 15:
PC/104 and PC/104 Plus
expansion
Description
The PC/104 and PC/104
Plus
connectors allow you to interface expansion
modules such as A/D converters, CardBus, digital I/O, serial ports, etc.
Modules can be stacked to form a highly integrated control system. The
PC/104
Plus
expansion bus supports mastering devices.
Note
The actual maximum number of modules in a stack is limited primarily to
the capacitive loading on the bus and the electrical noise environment.
This is especially true when wide temperature operation is required. Good
design practice dictates that the modules present only one load to each
bus signal. Unfortunately, there are modules on the market that violate
this practice by loading the bus more heavily. Typically, it is the IOW*,
IOR*, MEMW*, and RSTDRV* lines. For example, if the IOW* line is
routed to four ICs on the module without a buffer, then the loading is
equivalent to four PC/104 modules. Stacks with three or more expansion
modules should be carefully tested under all environmental conditions. If
possible, query the manufacture of the expansion module regarding
loading. All Octagon products present one load.
The situation is even more critical for the PC/104
Plus
connector since the
bus speed is four times faster. The PC/104
Plus
connector and the PC/104
Plus
module represent one load each. Adding more than one PC/104
Plus
module (two loads) should trigger the same testing as discussed in the
previous paragraph.
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Содержание PC-600
Страница 23: ...Figure 2 1 PC 600 connector and jumper diagram 23 ...
Страница 24: ...Figure 2 2 PC 600 center to center hole dimensions thousandths 24 ...
Страница 25: ...Figure 2 3 PC 600 center to center hole dimensions millimeters 25 ...
Страница 150: ...Table C 3 Miscellaneous part numbers Product Description Octagon p n AT battery Calendar clock battery backup 3186 150 ...