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VIPER Technical Manual Detailed hardware description
© 2007 Eurotech Ltd Issue E 67
PC/104 interface
The VIPER PC/104 interface is emulated from the PXA255 PCMCIA interface to
support 8/16 bit ISA bus style signals. As the interface is an emulation the VIPER does
not support some PC/104 features. Please refer to the
72HUnsupported PC/104 interface
features, page 373H70, for specific details.
Add-on boards can be stacked via the PC/104 interface to enhance the functionality of
the VIPER. Eurotech Ltd has an extensive range of PC/104 compliant modules and
these can be used to quickly add digital I/O, analogue I/O, serial ports, video capture
devices, PC card interfaces, etc.
Accessing the PC/104 interface
The ISA bus is based on the x86 architecture and is not normally associated with RISC
processors. It is necessary to modify standard drivers to support any third party
PC/104 modules.
Any PC/104 add-on board attached to the VIPER shall be available from the PC card
memory space socket 1.
Address Region name
0x3D000000 – 0x3FFFFFFF Reserved
0x3C000000 – 0x3CFFFFFF
PC/104 memory space,
8 (write only) or 16-bit (16MB)
0x30000400 – 0x3BFFFFFF Reserved
0x30000000 – 0x300003FF PC/104 I/O space, 8 or 16-bit (1kB)
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