Mezzanine
(ADC12D1X00RFRB)
Carrier
FMC_PG_M2C
J156
Override power
good M2C (indicates
power good from
Mez. to Carrier)
J155
Override power
good C2M
(FPGA will
output data on
FMC)
FMC_PG_C2M
Reference Board Functional Description
Apply the trigger signal at J26, the EXT_TRIG SMA. If the voltage applied, Vtrigger is less than the
threshold, Vth, of the MC100EP16, then the system will not capture. If Vtrigger is greater than Vth, then a
data capture will occur. Vth is approximately 2.1V, so it is recommended that high trigger voltage is in the
range of {2.5V, 3.3V}. The low trigger voltage should be 0V. Note that this may be a single shot data
capture or a continuous trigger. If the trigger is armed, but Vtrigger is not greater than Vth within
approximately 3 minutes, then the software will time out and show the error message: “Board failed to
collect samples.”
Figure 22. Trigger circuit on reference board
1. Connect a signal source to the EXT_TRIG SMA (J26).
2. In the WaveVision5 GUI, select Registers – Settings – check the H/W Trigger box.
3. Select single or continuous capture.
4. Apply Vtrigger above the threshold, Vth, when ready to capture.
Auxiliary Port:
FMC connector forms an auxiliary data port. With it, the FPGA captures the ADC’s high-
speed continuous streaming data and retransmits the data out of the FMC port. See photo below of the
FMC port on the bottom of the board.
•
Install J155 to force FPGA to output data on FMC port (without a power good signal from Carrier to
Mezzanine). This is useful when a non FMC compliant board is connected to Mezzanine
(ADC1xDxxxx(RF)RB)
•
Install J156 to force a power good signal from Mezzanine (ADC12D1X000RFRB) to Carrier. This is
used to override for initial FPGA debug.
Figure 23. Explanation of Power Good override jumpers for FMC port
27
SNAU146 – September 2013
ADC1xDxxxx(RF)RB Reference Board
Copyright © 2013, Texas Instruments Incorporated