Manual

Description of the data path
GUPPY Technical Manual V7.1.0
132
Loading an LUT into the camera
Loading the LUT is carried out through the data exchange buffer called
GPDATA_BUFFER. As this buffer can hold a maximum of 2 kB, and a complete
LUT at 1024 x 8 bit is 1 kB, programming can take place in a one block write
step. The flow diagram below shows the sequence required to load data into
the camera.
Note

• The input value is the 10-bit value from the digitizer.
The gamma LUT of the CCD models outputs the most
significant 8 bit as shown above.
• As gamma correction for the CCD models is also imple-
mented via the look-up table, it is not possible to use a
different LUT when gamma correction is enabled.
• With all CCD models, the user LUT will be overridden
when gamma is enabled.
• Guppy F-036 (CMOS model) has the gamma function
built in the sensor, so that it will not be overridden.
• Guppy F-503 (CMOS model) behaves like Guppy CCD
cameras.
• LUT content is volatile.
Figure 70: Loading an LUT
Note

Configuration
• To configure this feature in an advanced register: See
Table 119: Advanced register: LUT on page 266.
• Information on GPDATA_BUFFER: See Chapter
GPDATA_BUFFER on page 283.
Query Limits from
Register:
LUT_INFO and
GPDATA_INFO
Set EnableMemWR
to true (1)
Set AddrOffset to 0
Write LUT data in
GPDATA_BUFER
Set EnableMemWR
to false (0)