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Theory of Operation
PC2-Comp Express
Frame Lost
The Frame Lost event indicates that an acquired image could not be transferred to onboard memory.
An example would be if there were no free onboard buffers available for the new image. This will
usually be the case if the image transfer from onboard buffers to host PC memory cannot be sustained
due to PCI bus bandwidth. If multiple PCI bus master devices are active simultaneously, it is possible
that the PC2-Comp Express PCI controller cannot transfer onboard buffers in time for the next
acquired frame. The Sapera event value is CORACQ_VAL_EVENT_TYPE_FRAME_LOST.
Start of Frame
The Start of Frame event represents the beginning of a full frame transfer from front end to onboard
memory. For interlaced video, there is one Start of Frame event for each pair of fields. The Sapera
event value is CORACQ_VAL_EVENT_TYPE_START_OF_FRAME.
Start of Field
The Start of Field event is only available for interlaced scan cameras. There is a Start of Field event at
the beginning of each field transferred from front end to onboard memory (two per frame). The Sapera
event value is CORACQ_VAL_EVENT_TYPE_START_OF_FIELD.
Start of Odd Field
The Start of Odd Field event is only available for interlaced scan cameras. There is a Start of Odd
Field event at the beginning of each incoming odd field transferred from front end to onboard memory.
The Sapera event value is CORACQ_VAL_EVENT_TYPE_START_OF_ODD.
Start of Even Field
The Start of Even Field event is only available for interlaced scan cameras. There is a Start of Even
Field event at the beginning of each incoming even field transferred from front end to onboard
memory. The Sapera event value is CORACQ_VAL_EVENT_TYPE_START_OF_EVEN.
End of Frame
The End of Frame event is generated when the last image pixel is transferred from front end to
onboard memory. The Sapera event value is CORACQ_VAL_EVENT_TYPE_END_OF_FRAME.
End of Field
The End of Field event is only available for interlaced scan cameras. There is an End of Field event
when the last field has been transferred from front end to onboard memory. The Sapera event value is
CORACQ_VAL_EVENT_TYPE_END_OF_FIELD.
Summary of Contents for PC2-Comp Express OC-P2EM-COMP0
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Page 38: ...32 Theory of Operation PC2 Comp Express ...
Page 46: ...40 Technical Reference PC2 Comp Express ...
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Page 65: ...PC2 Comp Express Sapera LT 59 EMI Certifications Class A both FCC and EC ...
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