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1.6 KiB
1.6 KiB
RK3399 has 6x SPI controllers with the following features:
- Support master and slave mode, software-configurable
- DMA-based or interrupt-based operation
- Embedded two 32x16bits FIFO for TX and RX operation respectively
On Helios64, the buses are divided into three types: Not Available, System (internal bus) and User (external bus).
Bus | Usage | Remarks |
---|---|---|
0 | Not Available | |
1 | System | Bootable SPI Flash |
2 | User | User Application |
3 | Not Available | |
4 | Not Available | |
5 | System | Reserved for Production use only |
Internal Bus
Bus | Chip Select | Device | Remarks |
---|---|---|---|
1 | 0 | W25Q128JV | Bootable SPI Flash |
5 | 0 | W25X20CL | SATA Controller ROM |
Bootable SPI Flash
Helios64 is equipped with Winbond W25Q128JV 3V 128M-Bit Serial Flash Memory as a Bootable SPI NOR Flash.
This flash contains
- Preloader & bootloader
Binaries | Offset | Remarks |
---|---|---|
Preloader | 0x0040 | U-Boot TPL & SPL |
Bootloader | 0x4000 | U-Boot & ATF |
- Electronic nameplate data in Security Register
External Bus
Bus | Chip Select | Remarks |
---|---|---|
2 | 0 | User Application |
SPI Bus for user application is exposed on UEXT header (P2)
Pin | Signal Name |
---|---|
7 | MISO |
8 | MOSI |
9 | SCK |
10 | SSEL |
Note: The pin voltage level is 3.3V.