Manual

Description of the data path
MARLIN Technical Manual V2.4.0
83
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
L
• The input value is the most significant 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 overwritten
when Gamma is enabled and vice versa.
• CMOS models have the gamma function built in the sen-
sor, so that it won’t be overwritten.
• LUT content is by default volatile, use user set func-
tionality to store the LUT permanently in the camera.
Figure 41: Loading an LUT
Note
L
Configuration
• To configure this feature in an advanced register: See
Table 107: Advanced register: LUT on page 213.
• For information on GPDATA_BUFFER: See Chapter
GPDATA_BUFFER on page 235.
Query Limits from
Register:
LUT_INFO and
GPDATA_INFO
Set EnableMemWR
to true (1)
Set AddrOffset to 0
Write LUT data in
GPDATA_BUFFER
Set EnableMemWR
to false (0)