Data Translation DT3130 Series, Руководство пользователя

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Chapter 2
38
Acquisition Operations
DT3130 Series boards can acquire interlaced frames or individual
fields either synchronously or asynchronously, and store them in
system memory. In a synchronous acquisition, you cannot perform
another operation until the synchronous acquisition completes. In an
asynchronous acquisition, the operation starts but gives control to
you immediately, allowing you to perform other operations while
data is acquired.
Using the DT3130 Series , you can acquire a single full frame, a single
field (subframe), multiple full frames, or multiple fields. Data is
stored to an area in system memory that is allocated by the DT3130
Series Device Driver (called
device memory ). Table 6 lists the memory
size that is used for each image format and image type supported.
An interrupt is generated when an even or odd field has been
acquired; the PCI bus assigns the interrupt to the board automatically
when it is installed.
Table 6: Memory Used
Video Format
Storage Image
Format
Maximum Memory Used
(Bytes)
60 Hz RGB or RGB24 1,228,800
RGB16 or YUYV422 614,400
MONO 307,200
50 Hz RGB or RGB24 1,769,472
RGB16 or YUYV422 884,736
MONO 442,368