Hardware Reference
In-Depth Information
Photo 2.10
Typical prototype card bus interface logic
Figure 2.6
Basic arrangement of the PC/104 bus
The PC/104 bus
Despite the popularity of the PC and PC/AT bus architectures as a means of
providing bus expansion for general purpose (desktop) and dedicated (non-
desktop) applications their use on embedded systems has been limited by the
relatively large size of expansion cards as well as the somewhat cumbersome
method of interconnection. The PC/104 bus was developed in order to overcome
these limitations.
The
PC/104
bus
offers
the
following
advantages
over
the
ISA/EISA
standards:
•
reduced card size;
•
use of self-stacking system which has a small footprint and also eliminates
the need for a backplane;
•
reduced bus drive (and hence reduced power consumption overall).
The PC/104 bus is available in two versions, 8-bit and 16-bit, which corres-
pond to the PC and PC/AT bus standards, respectively (Figure 2.6). To help
