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<strong>VIPER</strong> <strong>Technical</strong> <strong>Manual</strong>Detailed hardware descriptionPC/104 interfaceVLThe <strong>VIPER</strong> PC/104 interface is emulated from the PXA255 PCMCIA interface tosupport 8/16 bit ISA bus style signals. As the interface is an emulation the <strong>VIPER</strong> doesnot support some PC/104 features. Please refer to the Unsupported PC/104 interfacefeatures, page 70, for specific details.Add-on boards can be stacked via the PC/104 interface to enhance the functionality ofthe <strong>VIPER</strong>. Arcom has an extensive range of PC/104 compliant modules and these canbe used to quickly add digital I/O, analog I/O, serial ports, video capture devices, PCcard interfaces, etc.Accessing the PC/104 interfaceThe ISA bus is based on the x86 architecture and is not normally associated with RISCprocessors. It is necessary to modify standard drivers to support any third party PC/104modules.Any PC/104 add-on board attached to the <strong>VIPER</strong> shall be available from the PC cardmemory space socket 1.Address0x3D000000 – 0x3FFFFFFF0x3C000000 – 0x3CFFFFFF0x30000400 – 0x3BFFFFFF0x30000000 – 0x300003FFRegion nameReservedPC/104 memory space,8 (write only) or 16-bit (16MB)ReservedPC/104 I/O space, 8 or 16-bit (1kB)© 2007 Arcom Issue D 67
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