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docs: Update SWTG024AS with the right gpio numbering.

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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.
This commit is contained in:
René van Dorst
2025-09-07 23:32:58 +02:00
parent f812970ca0
commit f364f61c65
1 changed files with 73 additions and 30 deletions
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doc/devices/SWTG024AS.md
+73 -30
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@@ -16,10 +16,10 @@ Also the RJ45 connectors can be all plastic/non-shielded or with metal shielding
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. 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.
### Bottom ### Bottom
* R105: Installed, goes to R10-PullDown SFP2 -> TX DISABLE * R105: Installed, goes to R10-PullDown SFP2 -> TX DISABLE
* R85: Not Installed (Connected to K1) * R85: Not Installed (Connected to K1)
* R90: Not installed (PowerLed) * R90: Not installed (PowerLed)
* LED3: Not installed (PowerLed) * LED3: Not installed (PowerLed)
### Top ### Top
* K1: Not installed (Reset butten) * K1: Not installed (Reset butten)
* R95: Installed (SFP2 signal RX-LOS), mean that the manage version can use RX-LOS function. * R95: Installed (SFP2 signal RX-LOS), mean that the manage version can use RX-LOS function.
@@ -29,32 +29,32 @@ Changes I found with my own board vs [Managed version](https://github.com/up-n-a
### Notes ### Notes
* `TX Disable`-SFP2 and Button `K1` share the same GPIO pin via `R105` and `R85`. * `TX Disable`-SFP2 and Button `K1` share the same GPIO pin via `R105` and `R85`.
But with `R88`, `TX Disable`-SFP2 can be mapped to `C4`. But via `R88`, `TX Disable`-SFP2 can be mapped to `GPIO36`.
* `TX Disable` pull-down resistos on both SFP are to low to drive by the SOC. * `TX Disable` pull-down resistos on both SFP are to low to drive by the SOC.
We need to make a `Best`-BOM variant so we can use all the featues. We need to make a `Best`-BOM variant so we can use all the featues.
# Connectors # Connectors
|`J4` SFP1 PINs | Signal | Component | GPIO | Notes | |`J4` SFP1 PINs | Signal | Component | GPIO | Notes |
|---|---|---|---|---| |---|---|---|---|---|
|2| TX_FAULT | B-R262 | --- | | |2| TX_FAULT | B-R262 | --- | |
|3| TX_DISABLE | B-R263, T-R268 | C6 | R262 = Pull-down 200R| |3| TX_DISABLE | B-R263, T-R268 | GPIO38 | R262 = Pull-down 200R|
|4| MODDEF2 – SDA | B-R261 | C7 | | |4| MODDEF2 – SDA | B-R261, T-R266 | GPIO39 | |
|5| MODDEF1 – SCL | B-R260, T-R267 |--- | | |5| MODDEF1 – SCL | B-R260, T-R267 | GPIO40 | Shared with both SFP |
|6| MODDEF0 – PRESENT | B-R259, T-R296 | B30 | | |6| MODDEF0 – PRESENT | B-R259, T-R296 | GPIO30 | |
|7| RATE SEL | B-R257 | --- | | |7| RATE SEL | B-R257 | --- | |
|8| LOS | B-R258, T-R270 | C5 | | |8| LOS | B-R258, T-R270 | GPIO37 | |
|9| TO? | B-R256 | --- | | |9| TO? | B-R256 | --- | |
|`J2` SFP2 PINs | Signal | Component | GPIO | Notes | |`J2` SFP2 PINs | Signal | Component | GPIO | Notes |
|---|---|---|---|---| |---|---|---|---|---|
|2| TX_FAULT | B-R70 | --- | | |2| TX_FAULT | B-R70 | --- | |
|3| TX_DISABLE | B-R10, T-R88-L | C22 | R10 = Pull-down 200R | |3| TX_DISABLE | B-R10, B-R105-R, T-R88-L | GPIO54 | R10 = Pull-down 200R |
|4| MODDEF2 – SDA | B-R26 | C9 | | |4| MODDEF2 – SDA | B-R26, T-R85 | GPIO41 | |
|5| MODDEF1 – SCL | B-R15, T-R87 | --- | | |5| MODDEF1 – SCL | B-R15, T-R87 | GPIO40 | Shared with both SFP |
|6| MODDEF0 – PRESENT | B-R14, T-R89 | C18 | | |6| MODDEF0 – PRESENT | B-R14, T-R89 | GPIO50 | |
|7| RATE SEL | B-R12 | --- | | |7| RATE SEL | B-R12 | --- | |
|8| LOS | B-R13, T-R95 | C19 | | |8| LOS | B-R13, T-R95 | GPIO51 | |
|9| TO? | B-R11 | --- | | |9| TO? | B-R11 | --- | |
Note: component numbering `<L>-<REFDES>-<SIDE>` Note: component numbering `<L>-<REFDES>-<SIDE>`
* L: Layer, T=Top, B=Bottom * L: Layer, T=Top, B=Bottom
@@ -79,22 +79,65 @@ Signals are based on that `U4` is likely a I2C-EEPROM, `U10` is likely other SPI
### T8 ### T8
|`T8` pin|what|Signal| |`T8` pin|what|Signal|
|---|---|---| |---|---|---|
| 1 | C14 | | | 1 | GPIO46 | |
| 2 | GND | | | 2 | GND | |
| 3 | C16 | | | 3 | GPIO48 | |
| 4 | 3V3 | | | 4 | 3V3 | |
| 5 | C15 | | | 5 | GPIO47 | |
| 6 | C17 | | | 6 | GPIO49 | |
# Reset ciruit # Reset ciruit
| Cmp | Function | | Cmp | Function |
|---|---| |---|---|
| R78 | 33k PullUp| | T-R78 | 33k PullUp |
| D3 | Discharge Diode | | T-D3 | Discharge Diode |
| C187 | RC-Delay | | T-C187 | RC-Delay |
Reset-line found at `T-D3-D` active-low. Reset-line found at `T-D3-D` active-low.
# GPIO
| HEX VAL. | GPIO | Component | What | | GPIO | Component | What |
| -------- | ------ | ---- | ---- | ---- | ---- | ---- | ---- |
| 00000001 | GPIO00 | T-C151T, T-R28T, T-R29T |? | | GPIO32 | T-R143-R | U0RXD |
| 00000002 | GPIO01 | T-C152T |? | | GPIO33 | | |
| 00000004 | GPIO02 | T-C153T |? | | GPIO34 | | |
| 00000008 | GPIO03 | T-R33T |? | | GPIO35 | | |
| 00000010 | GPIO04 | B-C155 |? | | GPIO36 | T-R88L | Optional SFP-TX-DIS[^2] |
| 00000020 | GPIO05 | B-C156 |? | | GPIO37 | SFP1-8, R270 | SFP-LOS |
| 00000040 | GPIO06 | T-C157T |? | | GPIO38 | SFP1-3, R268 | SFP-TX-DIS[^2] |
| 00000080 | GPIO07 | T-C158T, R165 |? | | GPIO39 | SFP1-4, R266 | I2C-SDA4 |
| 00000100 | GPIO08 | | | | GPIO40 | SFP2-5, T-R87; SFP1-5, T-R267; | I2C-SCL |
| 00000200 | GPIO09 | SFP2-LED? |LEDx[^1] | | GPIO41 | SFP2-4, R85 | I2C-SDA |
| 00000400 | GPIO10 | | | | GPIO42 | | |
| 00000800 | GPIO11 | SFP2-LED? |LEDx[^1] | | GPIO43 | | |
| 00001000 | GPIO12 | PORT1-LED-COMMON |LEDx[^1] | | GPIO44 | | |
| 00002000 | GPIO13 | PORT1-LED-GREEN |LEDx[^1] | | GPIO45 | | |
| 00004000 | GPIO14 | PORT1-LED-YELLOW |LEDx[^1] | | GPIO46 | T8-1 | ? |
| 00008000 | GPIO15 | PORT2-LED-COMMON |LEDx[^1] | | GPIO47 | T8-5 | ? |
| 00010000 | GPIO16 | PORT2-LED-GREEN |LEDx[^1] | | GPIO48 | T8-3 | ? |
| 00020000 | GPIO17 | PORT2-LED-YELLOW |LEDx[^1] | | GPIO49 | T8-6 | ? |
| 00040000 | GPIO18 | PORT3-LED-COMMON |LEDx[^1] | | GPIO50 | SFP2-6, R89 | SFP-DETECT |
| 00080000 | GPIO19 | PORT3-LED-GREEN |LEDx[^1] | | GPIO51 | SFP2-8, R95 | SFP-LOS |
| 00100000 | GPIO20 | PORT3-LED-YELLOW |LEDx[^1] | | GPIO52 | | |
| 00200000 | GPIO21 | PORT4-LED-COMMON |LEDx[^1] | | GPIO53 | | |
| 00400000 | GPIO22 | PORT4-LED-GREEN |LEDx[^1] | | GPIO54 | SFP2-3, T-R105L | SFP-TX-DIS[^2] or via T-R85 to RESET[³3] |
| 00800000 | GPIO23 | PORT4-LED-YELLOW |LEDx[^1] | | GPIO55 | | |
| 01000000 | GPIO24 | SFP1-LED? |LEDx | | GPIO56 | | |
| 02000000 | GPIO25 | | | | GPIO57 | | |
| 04000000 | GPIO26 | SFP1-LED? |LEDx | | GPIO58 | | |
| 08000000 | GPIO27 | R44L |? | | GPIO59 | | |
| 10000000 | GPIO28 | R50 |? | | GPIO60 | | |
| 20000000 | GPIO29 | | | | GPIO61 | | |
| 40000000 | GPIO30 | SFP1-6, R269 |SFP-DETECT | | GPIO62 | | |
| 80000000 | GPIO31 | T-R144-R |U0TXD| | GPIO63 | | |
Note:
* [^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.
* [^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.
* [³3]: GPIO54 is used for the reset-button. `T-R85` is placed.
# Power supply # Power supply
Board has two supply rails. Board has two supply rails.