FLIR ADK - GMSL 1 Data Format and Boson Settings; Interpreting Multiplexed IR16 Video; Syncing Boson via SerDes GPIO Pins

FLIR ADK
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4.7 Data Format and Boson Settings for GMSL 1
The GMSL option for Boson currently supports both 8-bit and 16-bit data. Of the 24-bit CMOS
output from the Boson only the lower 8-bits are physically connected to the Serializer. 8-bit
video over GMSL is available using CMOS configurable options that utilize the lower 8 bits
(0-7) of the CMOS output. This is the standard 8-bit AGC video data output from the Boson.
For 16-bit video it is necessary to configure the CMOS output to multiplex the lower 8-bits of
the CMOS output. To do this the CMOS channel must be put in IR16 video mode and then it
must be set to Multiplex or “Double wide” mode. Double wide mode is currently only
available on Boson software version 2.0.18283. GMSL ADKs will have this version already
installed. If you are buying Boson core, you may need to upgrade your camera.
4.8 Interpreting the Multiplexed/ Double wide IR16 video
The data comes across the GMSL link as a 1280 x 513 frame, where Column 1 contains the
top 8 bits of Column 1 of the VGA sensor’s first column, and Column 2 contains the bottom 8
bits of the VGA sensor’s first column.
Stitching the top and bottom bits will yield the correct values for the IR16 image. The
resultant frame should be the resolution of the sensor, 640x512, plus telemetry.
P1[15:8]
P1[7:0]
P2[15:8]
P2[7:0]
P3[15:8]
P3[7:0]
P4[15:8]
P4[7:0]
4.9 Syncing the Boson using GPIO pins of the SerDes
The Boson can be synchronized using the GPIO pins on the serializer and deserializer. For
the MAX9295A serializer used on the ADK, one must correctly set MFP7 pin for D12 disabled.
This includes doing a register write of 0x07 to register 0x0007 (It is originally set to 0xF7).
This correctly works with the priority established by Maxim to enable GP0 over D12.
For GMSL 1, the deserializer will need to have an input into the GPI pin with a pulse width of
>0.35us. The GPI pin on the deserializer will need to be linked to MFP7 on the serializer.
To establish sync with the Boson the Boson needs to be configured to One Shot mode and
External Sync Slave mode. Note that sync pulses must be applied before the Boson is
configured to External Sync Slave mode or the Boson will fault and subsequently restart. The
Boson looks at the rising edge of the incoming sync signal, and pulse width has a wide range
of accepted variability. For the GMSL deserializer the sync pulse must be a 1.8 V logic high