61 lines
1.6 KiB
Markdown
61 lines
1.6 KiB
Markdown
RK3399 has 6x SPI controllers with the following features:
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- Support master and slave mode, software-configurable
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- DMA-based or interrupt-based operation
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- Embedded two 32x16bits FIFO for TX and RX operation respectively
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On Helios64, the buses are divided into three types: *Not Available*, *System* (internal bus) and *User* (external bus).
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| Bus | Usage | Remarks |
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|-----|-------|-----------|
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| 0 | Not Available | |
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| 1 | System | Bootable SPI Flash |
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| 2 | User | User Application |
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| 3 | Not Available | |
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| 4 | Not Available | |
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| 5 | System | Reserved for Production use only |
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## Internal Bus
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| Bus | Chip Select | Device | Remarks |
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|-----|-------------|---------|---------|
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| 1 | 0 | W25Q128JV | Bootable SPI Flash |
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| 5 | 0 | W25X20CL | SATA Controller ROM |
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### Bootable SPI Flash
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Helios64 is equipped with [Winbond W25Q128JV 3V 128M-Bit Serial Flash Memory](https://www.winbond.com/hq/product/code-storage-flash-memory/serial-nor-flash/?__locale=en&partNo=W25Q128JV)
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as a Bootable SPI NOR Flash.
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This flash contains
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- Preloader & bootloader
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| Binaries | Offset | Remarks |
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|----------|--------|---------|
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| Preloader | 0x0040 | U-Boot TPL & SPL |
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| Bootloader | 0x4000 | U-Boot & ATF |
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- Electronic nameplate data in Security Register
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## External Bus
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| Bus | Chip Select | Remarks |
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|-----|-------------|---------|
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| 2 | 0 | User Application |
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SPI Bus for user application is exposed on [UEXT header (P2)](/helios64/uext/)
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| Pin | Signal Name |
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|-----|-------------|
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| 7 | MISO |
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| 8 | MOSI |
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| 9 | SCK |
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| 10 | SSEL |
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**Note:** The pin voltage level is 3.3V.
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