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PCI interface
27
PCI interface
Matrox CronosPlus has a 32-bit PCI bus interface, which is capable of a peak
transfer rate of 132 Mbytes/sec, and operates at 33 MHz.
Matrox CronosPlus uses an internal FIFO to buffer image data while waiting to
access the PCI bus. This helps prevent loss of image data during long bus-access
latencies found in heavily loaded systems. When the PCI bus is extremely loaded,
Matrox CronosPlus might not be able to empty the FIFO when required. This
problem causes an acquisition error known as a "Acquisition error: Data transfer
error (FIFO overflow)". A way to reduce the occurrence of this error is to grab
into a YUV16 packed buffer instead of a BGR24 or BGR32 buffer. Alternatively,
when an error occurs, the driver will restart the grab as many times as you specify
using MdigControl() with M_GRAB_FAIL_RETRY_NUMBER.
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