4-12 Theory of Operation
4.4 PCI Card
The PCI card is the interface between the PCI bus on the processor card and the
rest of the system (acquisition system and amplifier for speaker). It has the
following interfaces:
- PCI interface (32 bit 33MHz bus with bus mastering capability)
- Acquisition data interface using 32bit local bus.
- Acquisition control interface using 8bit local bus.
- Dallas OneWire interface and chip for scope id.
- Audio amplifier for internal speaker.
Figure 4-10 PCI Card Block Diagram
4.4.1 PCI Interface
The PCI interface is implemented with a Xilinx FPGA. It is a 32 bit, 33 MHz bus
master that allows the PCI card to take control of the PCI bus and push data directly
into the processor memory without requiring the direct involvement of the processor.
In readout mode, the FPGA reads the data and puts it in the correct time order for
the processor memory. The FPGA also has a special readout mode to access the
acquisition data in roll mode, store the data, and then transfer this data in blocks to
the processor memory. This implementation is the most complicated but is needed
in order to maximize the PCI throughput.
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