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SWTG024AS: Document Slave Interface

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René van Dorst
2025-12-22 14:32:23 +01:00
parent 4e9fb19e05
commit 053c16b84e
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doc/devices/SWTG024AS.md
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@@ -91,21 +91,28 @@ Note: component numbering `<L>-<REFDES>-<SIDE>`
* SIDE: Side of the component. when the rj45 are facing towards you are you can read the silkscreen normal.
L = Left, R=right, B=bottom, T=top or P with a pin number.
### T3
This connector seems to go to U4 and U10.
I thing is used to connect a external CPU to controlle the SOC.
Even to program the flash via the SOC.
### T3, Slave Interface
This connector goes to U4 `I2C EEPROM` and U10 `SPI FLASH`.
Signals are based on that `U4` is likely a I2C-EEPROM, `U10` is likely other SPI-chip.
|`T3` pin|what|Signal|
|---|---|---|
|1| U4-P6, 33R U10-P6 | I2C-SCL, SPI-CLK |
|1| U4-P6, 33R U10-P6 | I2C-SCL, SPI-CLK, Slave SCK/SCL/MDC/EE_SCL |
|2| GND | --- |
|3| U4-P5, U10-P5 | I2C-SDA, SPI-DI/DO |
|3| U4-P5, U10-P5 | I2C-SDA, SPI-DI/DO, Slave SDI/SDA/MDIO/EE_SDA |
|4| VCC |
|5| 33R -> U10-P2 | SPI-DO/D1 |
|6| U10-P1 | SPI-CS |
Note: 1 pin is square shaped.
The Slave Interface allows an extenal host to controll the SOC even if the internal MCU is used.
Depending on the `IF_SEL` bootstrap resistors, this can me `I2C`, `SPI` or `SMI`.
On this device it is `I2C` on address `0b1011100` or `0x5c` (7-bit notation).
* I2c Read: must be a write_read opperation `<Dev-ADDR><RegAddr15:8><RegAddr7:0>` `<DevAddr><Data7:0><Data15:8><Data23:16><Data31:24>`.
* I2c Write: `<Dev-ADDR><RegAddr15:8><RegAddr7:0><DevAddr><Data7:0><Data15:8><Data23:16><Data31:24>`.
Example register `0x0004` return chip id `0x00, 0x00, 0x72, 0x83` = `0x83720000`.
### T5, serial console
|`T5` pin|GPIO|Signal|
|---|---|---|