The CPLDs (Complex Programmable Logic Devices) are mostly Altera MAX and have duties for system startup, managing the LEDs, Fans, temperature sensors. The CPLDs are connected back to the CPU through the UART or I2C bus.
As you can see the CPU which here is based on Intel C2538 (Atom) has a direct PCIe connection to the Broadcom Trident 2 chip.
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