Dalsa X64 Xcelera-CL PX4, Руководство пользователя

Страница: 53 / 127

X64 Xcelera-CL PX4 User's Manual X64 Xcelera-CL PX4 Reference
•
51
•
Frame Valid
Event generated when the connected sensor video frame start is detected by the board acquisition
hardware. Acquisition does not need to be started, therefore this event can verify a valid signal is
connected. The Sapera event value is CORACQ_VAL_EVENT_TYPE_VERTICAL_SYNC.
•
Pixel Clock (Present/Absent)
Event generated on the transition from detecting or not detecting a pixel clock signal. The Sapera
event values are CORACQ_VAL_EVENT_TYPE_NO_PIXEL_CLK and
CORACQ_VAL_EVENT_TYPE_PIXEL_CLK.
•
Frame Lost
The Frame Lost event indicates that an acquired image could not be transferred to on-board
memory. An example of this case would be if there are no free on-board buffers available for the
new image. This may be the case if the image transfer from onboard buffers to host PC memory
cannot be sustained due to bus bandwidth issues.
The Sapera event value is CORACQ_VAL_EVENT_TYPE_FRAME_LOST.
•
Vertical Timeout
This event indicates a timeout situation where a camera fails to output a video frame after a
trigger. The Sapera event value is CORACQ_VAL_EVENT_VERTICAL_TIMEOUT.
Transfer Events
Transfer events are the ones related to the transfer module. Transfer events provide feedback on image
transfer from onboard memory frame buffers to PC memory frame buffers.
•
Start of Frame
The Start of Frame event is generated when the first image pixel is transferred from onboard
memory into PC memory.
The Sapera event value is CORXFER_VAL_EVENT_TYPE_START_OF_FRAME.
•
End of Frame
The End of Frame event is generated when the last image pixel is transferred from onboard
memory into PC memory.
The Sapera event value is CORXFER_VAL_EVENT_TYPE_END_OF_FRAME.
•
End of Line
The End of Line event is generated after a video line is transferred to a PC buffer.
The Sapera event value is CORXFER_VAL_EVENT_TYPE_END_OF_LINE.
•
End of N Lines
The End of N Lines event is generated after a set number of video lines are transferred to a PC
buffer. The Sapera event value is CORXFER_VAL_EVENT_TYPE_END_OF_NLINES.
•
End of Transfer
The End of Transfer event is generated at the completion of the last image being transferred
from onboard memory into PC memory. To complete a transfer, a stop must be issued to the
transfer module (if transfers are already in progress). If a transfer of a fixed number of frames
was requested, the transfer module will stop transfers automatically. The Sapera event value is
CORXFER_VAL_EVENT_TYPE_END_OF_TRANSFER.