mirror of
https://github.com/logicog/RTLPlayground.git
synced 2026-08-30 14:52:51 +08:00
René van Dorst
f364f61c65
See #16 with new gpio information, commands etc. Added GPIO table and notes. Also found some LEDs but need more investigation how to control them.
158 lines
7.1 KiB
Markdown
158 lines
7.1 KiB
Markdown
### SWTG024AS
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SWTG024AS has at least 4 variants that look the same.
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Variants are `managed` and a `unmanaged` version.
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But both have pcb version `v1.0` and `v2.0`.
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Also the RJ45 connectors can be all plastic/non-shielded or with metal shielding.
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## Brands
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|Brand|Type|Managed|PCB|PCB Label|Flash|Chip RTL|
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|---|---|---|---|---|---|---|
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| LIANGUO |SWTG024AS |No| SWTG024AS-v2.0 | CM-23-11-2336 023-17453| 512kB| 8272 |
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| Haraco |ZX-SWTG124AS | Yes | SWTG024AS-v2.0 | ??? | ??? | 8272 |
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| Xikestore |SKS3200M-4GPY2XF | Yes | SWTG024AS-v1.0 | CM-23-08-2043 023-16721 | ??? | 8272 |
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# SWTG024AS-v2.0 managed vs unmanged
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Changes I found with my own board vs [Managed version](https://github.com/up-n-atom/SWTG118AS/tree/main/photos/SWGT024AS-v2.0) of the PCB.
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### Bottom
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* R105: Installed, goes to R10-PullDown SFP2 -> TX DISABLE
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* R85: Not Installed (Connected to K1)
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* R90: Not installed (PowerLed)
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* LED3: Not installed (PowerLed)
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### Top
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* K1: Not installed (Reset butten)
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* R95: Installed (SFP2 signal RX-LOS), mean that the manage version can use RX-LOS function.
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* R270: Installed (SFP1 signal RX-LOS)
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* R268: Installed (SFP2 signal TX_DISABLE, but R262 200R pull-down is to high to drive by the SOC, needs mod!)
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* U5: Flash is only 512kB instead of 2/4 MBit.
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### Notes
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* `TX Disable`-SFP2 and Button `K1` share the same GPIO pin via `R105` and `R85`.
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But via `R88`, `TX Disable`-SFP2 can be mapped to `GPIO36`.
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* `TX Disable` pull-down resistos on both SFP are to low to drive by the SOC.
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We need to make a `Best`-BOM variant so we can use all the featues.
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# Connectors
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|`J4` SFP1 PINs | Signal | Component | GPIO | Notes |
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|---|---|---|---|---|
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|2| TX_FAULT | B-R262 | --- | |
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|3| TX_DISABLE | B-R263, T-R268 | GPIO38 | R262 = Pull-down 200R|
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|4| MODDEF2 – SDA | B-R261, T-R266 | GPIO39 | |
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|5| MODDEF1 – SCL | B-R260, T-R267 | GPIO40 | Shared with both SFP |
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|6| MODDEF0 – PRESENT | B-R259, T-R296 | GPIO30 | |
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|7| RATE SEL | B-R257 | --- | |
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|8| LOS | B-R258, T-R270 | GPIO37 | |
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|9| TO? | B-R256 | --- | |
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|`J2` SFP2 PINs | Signal | Component | GPIO | Notes |
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|---|---|---|---|---|
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|2| TX_FAULT | B-R70 | --- | |
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|3| TX_DISABLE | B-R10, B-R105-R, T-R88-L | GPIO54 | R10 = Pull-down 200R |
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|4| MODDEF2 – SDA | B-R26, T-R85 | GPIO41 | |
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|5| MODDEF1 – SCL | B-R15, T-R87 | GPIO40 | Shared with both SFP |
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|6| MODDEF0 – PRESENT | B-R14, T-R89 | GPIO50 | |
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|7| RATE SEL | B-R12 | --- | |
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|8| LOS | B-R13, T-R95 | GPIO51 | |
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|9| TO? | B-R11 | --- | |
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Note: component numbering `<L>-<REFDES>-<SIDE>`
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* L: Layer, T=Top, B=Bottom
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* REFDEES: full silkscreen like `R123`
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* SIDE: Side of the component. when the rj45 are facing towards you are you can read the silkscreen normal.
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L = Left, R=right, B=bottom, T=top or P with a pin number.
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### T3
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This connector seems to go to U4 and U10.
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I thing is used to connect a external CPU to controlle the SOC.
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Even to program the flash via the SOC.
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Signals are based on that `U4` is likely a I2C-EEPROM, `U10` is likely other SPI-chip.
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|`T3` pin|what|Signal|
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|---|---|---|
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| 1 | U4-P6, 33R U10-P6| I2C-SCL, SPI-CLK |
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|2| GND | --- |
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|3| U4-P5, U10-P5 | I2C-SDA, SPI-DI/DO |
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|4| VCC |
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|5| 33R -> U10-P2 | SPI-DO/D1 |
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|6| U10-P1 | SPI-CS |
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### T8
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|`T8` pin|what|Signal|
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|---|---|---|
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| 1 | GPIO46 | |
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| 2 | GND | |
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| 3 | GPIO48 | |
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| 4 | 3V3 | |
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| 5 | GPIO47 | |
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| 6 | GPIO49 | |
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# Reset ciruit
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| Cmp | Function |
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|---|---|
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| T-R78 | 33k PullUp |
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| T-D3 | Discharge Diode |
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| T-C187 | RC-Delay |
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Reset-line found at `T-D3-D` active-low.
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# GPIO
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| HEX VAL. | GPIO | Component | What | | GPIO | Component | What |
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| -------- | ------ | ---- | ---- | ---- | ---- | ---- | ---- |
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| 00000001 | GPIO00 | T-C151T, T-R28T, T-R29T |? | | GPIO32 | T-R143-R | U0RXD |
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| 00000002 | GPIO01 | T-C152T |? | | GPIO33 | | |
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| 00000004 | GPIO02 | T-C153T |? | | GPIO34 | | |
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| 00000008 | GPIO03 | T-R33T |? | | GPIO35 | | |
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| 00000010 | GPIO04 | B-C155 |? | | GPIO36 | T-R88L | Optional SFP-TX-DIS[^2] |
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| 00000020 | GPIO05 | B-C156 |? | | GPIO37 | SFP1-8, R270 | SFP-LOS |
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| 00000040 | GPIO06 | T-C157T |? | | GPIO38 | SFP1-3, R268 | SFP-TX-DIS[^2] |
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| 00000080 | GPIO07 | T-C158T, R165 |? | | GPIO39 | SFP1-4, R266 | I2C-SDA4 |
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| 00000100 | GPIO08 | | | | GPIO40 | SFP2-5, T-R87; SFP1-5, T-R267; | I2C-SCL |
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| 00000200 | GPIO09 | SFP2-LED? |LEDx[^1] | | GPIO41 | SFP2-4, R85 | I2C-SDA |
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| 00000400 | GPIO10 | | | | GPIO42 | | |
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| 00000800 | GPIO11 | SFP2-LED? |LEDx[^1] | | GPIO43 | | |
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| 00001000 | GPIO12 | PORT1-LED-COMMON |LEDx[^1] | | GPIO44 | | |
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| 00002000 | GPIO13 | PORT1-LED-GREEN |LEDx[^1] | | GPIO45 | | |
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| 00004000 | GPIO14 | PORT1-LED-YELLOW |LEDx[^1] | | GPIO46 | T8-1 | ? |
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| 00008000 | GPIO15 | PORT2-LED-COMMON |LEDx[^1] | | GPIO47 | T8-5 | ? |
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| 00010000 | GPIO16 | PORT2-LED-GREEN |LEDx[^1] | | GPIO48 | T8-3 | ? |
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| 00020000 | GPIO17 | PORT2-LED-YELLOW |LEDx[^1] | | GPIO49 | T8-6 | ? |
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| 00040000 | GPIO18 | PORT3-LED-COMMON |LEDx[^1] | | GPIO50 | SFP2-6, R89 | SFP-DETECT |
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| 00080000 | GPIO19 | PORT3-LED-GREEN |LEDx[^1] | | GPIO51 | SFP2-8, R95 | SFP-LOS |
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| 00100000 | GPIO20 | PORT3-LED-YELLOW |LEDx[^1] | | GPIO52 | | |
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| 00200000 | GPIO21 | PORT4-LED-COMMON |LEDx[^1] | | GPIO53 | | |
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| 00400000 | GPIO22 | PORT4-LED-GREEN |LEDx[^1] | | GPIO54 | SFP2-3, T-R105L | SFP-TX-DIS[^2] or via T-R85 to RESET[³3] |
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| 00800000 | GPIO23 | PORT4-LED-YELLOW |LEDx[^1] | | GPIO55 | | |
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| 01000000 | GPIO24 | SFP1-LED? |LEDx | | GPIO56 | | |
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| 02000000 | GPIO25 | | | | GPIO57 | | |
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| 04000000 | GPIO26 | SFP1-LED? |LEDx | | GPIO58 | | |
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| 08000000 | GPIO27 | R44L |? | | GPIO59 | | |
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| 10000000 | GPIO28 | R50 |? | | GPIO60 | | |
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| 20000000 | GPIO29 | | | | GPIO61 | | |
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| 40000000 | GPIO30 | SFP1-6, R269 |SFP-DETECT | | GPIO62 | | |
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| 80000000 | GPIO31 | T-R144-R |U0TXD| | GPIO63 | | |
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Note:
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* [^1]: LEDs are found by just plugin a RJ45 connector and see with cmd `gpio` the status change. But the bit pattern for port 1,2 are diffrent from port 3,4.
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* [^2]: Only on the unmanaged verions are `R10` and `R268` placed. But the very low pull-down resistor `R10` & `R262` prevent to SOC to drive does pins. A mod is needed.
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* [³3]: GPIO54 is used for the reset-button. `T-R85` is placed.
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# Power supply
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Board has two supply rails.
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`0.95` and `3.3` volt.
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## `0.95` Core Voltage.
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Voltage is made by a `Richtek RT8120A` Buck converter.
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0.95V must be within 3%.
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## `3.3` Voltage
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Voltage is crated by a `TMI3244T` Buck converter.
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3.3V must be within 4.5%.
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Chip can deliver up to 4A and the sweetspot is at 1A.
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So higher power SFP-modules should work.
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