Guppy PRO Technical Manual
V4.1.2
81
•
The video data for each pixel are output in either 8-bit or 14-bit format
(Packed 12-Bit Mode: 12-bit format).
•
Each pixel has a range of 256 or 16384 (Packed 12-Bit Mode: 4096)
shades of gray.
•
The digital value 0 is black and 255 or 16383 (Packed 12-Bit Mode: 4095)
is white. In 16-bit mode the data output is MSB aligned.
Description of video data formats
The following tables provide a description of the video data format for the
different modes. (Source: IIDC V1.31; packed 12-bit mode: Allied Vision)
<YUV8 (4:2:2) format>
Each component has 8-bit data.
Field
Description
data_length
Number of bytes in the data field
tg
Tag field shall be set to zero
channel
Isochronous channel number, as programmed in the iso_channel field of the
cam_sta_ctrl register
tCode
Transaction code shall be set to the isochronous data block packet tCode
sy
Synchronization value (sync bit)
This is one single bit. It indicates the start of a new frame.
It shall be set to 0001h on the first isochronous data block of a frame, and shall be
set to zero on all other isochronous blocks
Video data payload Shall contain the digital video information
Table 33: Description of data block packet format
<YUV8 (4:2:2) format>
U
(K+0)
Y
(K+0)
V
(K+0)
Y
(K+1)
U
(K+2)
Y
(K+2)
V
(K+2)
Y
(K+3)
U
(K+4)
Y
(K+4)
V
(K+4)
Y
(K+5)
U
(K+Pn-6)
Y
(K+Pn-6)
V
(K+Pn-6)
Y
(K+Pn-5)
U
(K+Pn-4)
Y
(K+Pn-4)
V
(K+Pn-4)
Y
(K+Pn-3)
U
(K+Pn-2)
Y
(K+Pn-2)
V
(K+Pn-2)
Y
(K+Pn-1)
Table 34: YUV8 (4:2:2) format: Source: IIDC V1.31
