On-Board Devices - Cherry PUMA SOM-RK3399-Q7 User Manual

5.5 On-board Devices

5.5.1 Power-Manager
The Rockchip RK808 is connected to the CPU via RSB and an interrupt line:
5.5.2 DDR3
• 4GB RAM of DDR3-1600 (2 independent channels, each 32-bit wide)
5.5.3 eMMC
• eMMC connected through the 8-bit wide SDIO interface EMMC_D on the CPU.
5.5.4 NOR Flash
• 32 MiB serial NOR flash
• Connected to the CPU via SPI1:
5.5.5 Companion Controller
The on-board microcontroller provides additional features to the CPU, exposed via I2C and USB. It emulates
standard ICs and does not need custom drivers in Linux.
Feature
RTC
Temperature sensor and fan controller
CAN
The STM32-microcontroller can be flashed from the CPU by taking it into DFU mode (USB recovery). Pull BOOT0
low and cycle reset (GPIOs listed below). The microcontroller will appear as a new USB device in Linux.
RK3399-Q7 User Manual
© Cherry Embedded Solutions GmbH
RK808 Pin Function CPU Pin
19 SCL I2C0_SCL_u (ball N30)
18 SDA I2C0_SDA_u (ball M26)
49 IRQ GPIO1_C6 (ball L25)
Signal CPU Pin
RESET GPIO0_A5
Signal CPU Pin
CLK GPIO_B1 (ball P28)
MOSI GPIO_B0 (ball R31)
MISO GPI1_A7 (ball P27)
CS GPIO_B2 (ball P29)
CPU Connection
I2C
I2C
USB
Function CPU Pin
NRST GPIO1_D0
BOOT0 GPIO2_B4
Linux GPIO #
5
Emulated IC Qseven Pins
ISL1208 none
AMC6821 FAN_TACHOIN, FAN_PWMOUT
UCAN CAN0_TX, CAN0_RX
Linux GPIO #
56
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