ZEUS Technical Manual

Detailed hardware description

 

 

Unsupported PC/104 interface features

The ZEUS does not support the following PC/104 bus features:

•PC/104 IRQ9, IRQ14 and IRQ15 are not available.

•DMA is not supported. Therefore, AEN signal is set to a constant logical zero.

•Bus mastering is not supported. Therefore, do not connect any other master add- on board to the ZEUS PC/104 interface.

•Shared interrupts are not supported. Do not connect more than one add-on board to the same interrupt signal line.

•BALE signal is set to a constant logical one as the address is valid over the entire bus cycle. Add-on PC/104 boards that implement transparent latch on address lines LA17-LA23 are compatible with the ZEUS implementation of BALE.

•The PXA270 PCMCIA memory controller does not support 8-bit memory read accesses for common memory space.

•The PXA270 PCMCIA memory controller does not support PC/104 MEMCS# signalling, so there is no support for dynamic bus sizing.

© 2007 Eurotech Ltd Issue D

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