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Expansion Bus
Expansion Bus
The
PC/104-PLUS (PCI BUS)
The
The BIOS automatically allocates I/O and memory resources. However, manual PCI Interrupt routing will be used.
PC/104 (ISA BUS)
PC/104 modules are stacked on top the
The ÉlanSC520 Microcontroller uses a
Here is a summary of the differences between a legacy ISA bus and the GP bus implementation on the Lynx.
•Only DMA channels 5 and 6 are available to PC/104 devices
•IRQ15 is not available to PC/104 devices
•PC/104 bus devices cannot initiate bus access cycles. The ÉlanSC520 Microcontroller is always the master of the ISA bus.
•Address pipelining is not supported.
•IOCHK, REFRESH, and NOWS signals are not supported.
•MEMR and SMEMR are tied together. MEMW and SMEMW are tied together.
For a more detailed description of the GP bus and its differences from a standard ISA bus, see chapter 13 in the ÉlanSC520 Microcontroller User's Manual.
Note: On the
I/O CONFIGURATION
PC/104–Plus Modules
No hardware configuration is necessary except to jumper the expansion module for the correct slot number.
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