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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 133
FAQ# 21
:
How should I power the cameras ?
The RMV cameras require a constant power supply at a voltage of 12 volts and a current of
from 200mA to as much as 1000mA. The start up of the camera’s on board power supplies require
more than the steady state current, as much as three times as much. The input power should be
clean with no more than 500mV of ripple at full load.
FAQ# 22:
I am upgrading firmware from rev D5, what should I know ?
The RMV cameras have both a FPGA revision and a micro controller revision. The C5/D5
(Micro/FPGA revision) firmware implemented gain control using the analog variable gain amplifier in the
ADC’s. The later revisions (D9, DA, DB) changed from analog to digital gain. The change was made
so that the analog gains were preset to balance the two sensor taps for brightness and offset. The digi-
tal gain was then used to increase the image brightness.
When changing from Rev D5 to a new revision you should note that the common mode gain
control requires different gain range values. The old D5 analog gain was 0-1023 with a nominal setting
in the 200’s range. The new firmware using digital gain requires a fixed point number from 0 to 0xFFFF
where a gain of 1.0x = 0x1000 and a gain of 16x = 0xFFFF.
The microcontroller revision 2DB (using FPGA revision DB) adds a special ‘D5’ compatibility
mode that uses the older analog gain method. This compatibility mode can be accessed by;
{w040400f808}
D5 Compatibility mode enabled
{w040400f907}
D5 Compatibility mode disabled
The mode can be enabled and saved with the save camera state command.
{w0300000000}
Save camera state.
The mode status can be read from register 2, bit 11.
LUTS: The D5 firmware supported camera stored look up tables (LUTS), the D9/A/B
FAQ# 23:
What is DATA VALID or DVAL ?
The camera link specification calls for cameras to provide the following signals
24 data
LVAL = Line Valid (valid pixels within a line)
FVAL = Frame Valid (valid lines within a frame)
DVAL = Data Valid
Data Clock (Minimum of 20Mhz)
Data valid is a sent from the camera to the capture card to indicate valid data. It is used in the
RMV cameras during horizontal binning to indicate valid pixels. The capture card should be set to use
DVAL and only for active pixels.