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: http://www.arcetri.astro.it/irlab/fasti/doc/fastitalk/slide10.html
Дата изменения: Thu Jul 28 18:23:48 2005 Дата индексирования: Sat Dec 22 10:24:56 2007 Кодировка: Поисковые слова: south pole |
To get data the central controller need a fast parallel interface, capable to get more than 2-4 megasamples/sec from the A/D stage (CAD). Some commercial board level solutions exist, and we choose a National Instrument 6533 PCI-DIO. We wrote a suitable driver, and we plan to add nicer feature as DMA transfers.A new version of that board, the 6534, has been announced. The 6534 is plug in replaceable with the 6533, but has a 64Mbites buffer, eliminating the need of the BDF stage. |
To avoid data loss a big FIFO buffer (> 1Mbytes) is placed between the data conversion (CAD) and the parallel interface. If data rate is substantially lower than 0.5Msample/sec (as in L3CCD) or the new 6534 is available, this portion can be eliminated. |