Virtual PCI uses control signals within the PCI specification to delay data transfers until the emulator has enough time to review the prior data. Virtual PCI then accepts the next data word. The emulation side of Virtual PCI is controlled with a external clock input that is set to the emulation speed. The host side of Virtual PCI uses the normal system PCI clock. During master operation Virtual PCI provides an arbitration function then allows data to be written to main memory at a slow emulation speed.
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