Blackfly - CYLOD

Point Grey Blackfly Technical Reference
Appendix C: Control and Status Registers
Appendix C: Control and Status Registers
Some features of the Blackfly are accessible using control and status registers (CSRs) that conform to the IICD 1.32
standard.
These include the following:
• Frame Buffer—IMAGE_RETRANSMIT: 634h
• Flash Data memory—DATA_FLASH_CTRL: 1240h
• Pulse Width Modulation—GPIO_CTRL_PIN: 1110h-1140h and GPIO_XTRA_PIN: 1114h-1144h
• Trigger Modes—TRIGGER_MODE: 830h
• Lookup Table—LUT: 80000h – 80048h (IIDC 1.32)
• Embedded Image Information—FRAME_INFO: 12F8h
• Pixel Defect Correction—PIXEL_DEFECT_CTRL: 1A60h
C.1 IMAGE_RETRANSMIT: 634h
This register provides an interface to the camera’s frame buffer functionality.
Transmitting buffered data is available when continuous shot is disabled. Either One shot or Multi shot can be used to
transmit buffered data when Transfer_Data_Select = 1. Multi shot is used for transmitting one or more (as specified by
Count_Number) buffered images. One shot is used for retransmission of the last image from the retransmit buffer.
For GenICam features, One shot is the same as Single Frame and Multi shot is the
same as Multi Frame.
Image data is stored in a circular image buffer when Image_Buffer_Ctrl = 1. If the circular buffer overflows, the oldest
image in the buffer is overwritten.
Transmitted data is always stored in the retransmit buffer. If a last or previous image does not exist, (for example, an
image has not been acquired since a video format or mode change), the camera still transmits an image from the
retransmit buffer, but its contents are undefined.
The image buffer is initialized when Image_Buffer_Ctr is written to ‘1’. Changing the video format, video mode,
image_size, or color_coding causes the image buffer to be initialized and Max_Num_Images to be updated.
Format:
Field Bit Description
Image_Buffer_Ctrl [0]
Transfer_Data_Select [1]
[2-7] Reserved
Image Buffer On/Off Control
0: OFF, 1: ON
Transfer data path
0: Live data, 1: Buffered image data
Ignored if ISO_EN=1
Revised 12/13/2012
Copyright ©2012 Point Grey Research Inc.
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