COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
5.2.1.3. Digital Motherboard
The digital Mother board is one of the boards constituting the Main Signal Processing board. It is the one
dedicated to the interface between the chassis and the Main Signal Processing board, and the main digital signal
processing, performed by the Master and Slave FPGAs.
Two LEDs are located at the front panel of the board. See Annex 2.
Green LED. Turns to green and flashes at 1 PPS to show that the processing of the interface
between the Main Signal Processing board and the chassis is correctly downloaded and
running.
Unlit (or high rate flashing) in case of Main Signal Processing board or CPU board failure or in
case of problem on the PCI bus.
Red LED. Lit during firmware maintenance.
Eleven LEDs are located on the printed circuit board (open the top cover to check them). See Annex 2.
Red LED. Illuminates to indicate that there is an error on the DMA transfer on PCIe (shall not
be illuminated in regular operations).
Yellow LED. Microblaze load indicator. Partially lit. Not significant.
Green LED. IT indicator. Partially lit. Not significant.
Blue LED. Illuminates to indicate that the PCIe interface FPGA has been correctly loaded at
boot-up (illuminated in normal operations)
Red LED. Illuminates to indicate that the Master FPGA Digital Clock Manager is unlocked
(shall not be illuminated in regular operations).
Orange LED. Blinking at 2 Hz to show that the 250 MHz reference clock is present in the
Master FPGA (shall blink at 2 Hz in regular operations).
Green LED. Blinking at 1 Hz to show that the 125 MHz reference from the digital mother board
is present in the Master FPGA (shall blink at 1 Hz in regular operations).
Blue LED. Illuminates to indicate that the Master FPGA has been correctly downloaded by the
SPS application (DONE signal).
Red LED. Illuminates to indicate that the Slave FPGA Digital Clock Manager is unlocked (shall
not be illuminated in regular operations).
Orange LED. Blinking at 2 Hz to show that the 250 MHz reference clock is present in the Slave
FPGA (shall blink at 2 Hz in regular operations).
Green LED. Blinking at 1 Hz to show that the 125 MHz reference from the digital mother board
is present in the Slave FPGA (shall blink at 1 Hz in regular operations).
Blue LED. Illuminates to indicate that the Slave FPGA has been correctly downloaded by the
SPS application (DONE signal).
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