## 3 Tests and Results
### Kitsuine Backplane Verification
#### 3.2.2 On-Orbit Results  
Since the deployment of KITSUNE in March 2022, data communications between components in the main bus have been confirmed. For example, a ground command to activate the ADCS and set a specific ADCS mode was sent to the satellite. When the command was received, the main PIC sent a trigger through a DIO interface to activate the overcurrent protection (OCP) circuit that powered up the ADCS PIC. The main PIC then used UART lines to communicate with the ADCS PIC. The satellite log confirmed this set of actions. When a ground command to download ADCS telemetry data was sent to the satellite, the data stored in the ADCS FM were transferred to the bus system's shared FM. The data from the shared FM were then accessed by the COM PIC (via SPI) and downloaded to the ground. The downloaded satellite log and ADCS telemetry data confirmed that the routes between the bus and the ADCS were operational. DIO, UART, and SPI interfaces were connected to the CPLD. As a result, the CPLD was carrying out its function. Table 8 summarizes the on-orbit data communications via the main bus CPLD; the circles (\(\Circle\)) in the last column indicate that all 21 digital lines were verified to be working. The same verification was performed in the SPATIUM-II section. For example, a ground command to activate the LoRa payload was sent to the satellite. When the command was received, the main PIC sent a trigger through a DIO interface to activate the overcurrent protection (OCP) circuit that powered up the LoRa MCU. The main PIC then used UART lines to communicate with the LoRa MCU. The data from the LoRa payload were directly stored in the bus system's shared flash memory. The data from the shared flash memory were then accessed by the COM PIC (via SPI) and downloaded to the ground. The downloaded satellite log and LoRa data confirmed that the routes between the bus and the LoRa payload were operational. DIO, UART, and SPI interfaces were connected to the CPLD. As a result, the CPLD was carrying out its function. Table 9 summarizes the on-orbit data communications via the main bus CPLD. The circles in the last column indicate that all 15 digital lines were verified to be working. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Digital Lines** & **Baud Rate** & **On-Orbit Result** \\ \hline
2\(\times\) UART (Main PIC–\(\mathrm{\Delta}\)DB PIC) & 9600 & \(\Circle\) \\
2\(\times\) UART (Main PIC–\(\mathrm{\Delta}\)DCS PIC) & 9600 & \(\Circle\) \\
2\(\times\) UART (Main PIC–\(\mathrm{\Delta}\)SEND) & 115,200 & \(\Circle\) \\
2\(\times\) UART (COM PIC–\(\mathrm{\Delta}\)SEND) & 115,200 & \(\Circle\) \\
4\(\times\) SPI (\(\mathrm{\Delta}\)DCS PIC–Magnetometer) & 1,000,000 & \(\Circle\) \\
4\(\times\) SPI (\(\mathrm{\Delta}\)DCS FM–Shared FM) & 1,000,000 & \(\Circle\) \\ DIO (Main PIC–\(\mathrm{\Delta}\)DB OCP) & - & \(\Circle\) \\ DIO (ADCS PIC–Magnetometer nested) & - & \(\Circle\) \\ DIO (\(\mathrm{\Delta}\)DCS PIC–Magnetometer DRDY) & - & \(\Circle\) \\ DIO (Main PIC–\(\mathrm{\Delta}\)DCS OCP) & - & \(\Circle\) \\ DIO (COM PIC to CBAND CW) & - & \(\Circle\) \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Summary of on-orbit data communications in the main bus through CPLD. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Digital Lines** & **Baud Rate** & **On-Orbit Result** \\ \hline
2\(\times\) UART (Main PIC–\(\mathrm{\Delta}\)RoRa MCU) & 19,200 & \(\Circle\) \\
2\(\times\) UART (Main PIC–\(\mathrm{RPI}\)) & 19,200 & \(\Circle\) \\
2\(\times\) UART (Main PIC–\(\mathrm{\Delta}\)CAC) & 19,200 & \(\Circle\) \\
4\(\times\)SPI (LoRa /\(\mathrm{\Delta}\)CU–Shared FM) & 1,000,000 & \(\Circle\) \\
3\(\times\) DIO (Main PIC–\(\mathrm{\Delta}\)BC OCP) & - & \(\Circle\) \\ DIO (Main PIC–\(\mathrm{LoRa}\) OCP) & - & \(\Circle\) \\ DIO (Main PIC–\(\mathrm{RPI}\) OCP) & - & \(\Circle\) \\ DIO (Main PIC–\(\mathrm{GPS}\)) & - & \(\Circle\) \\ DIO (Main PIC to SDR) & - & \(\Circle\) \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Summary of on-orbit data communications in the SPATIUM-II bus through CPLD.