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Merge pull request #15 from vDorst/doc_SWTG024AS_v2.0_unmanaged
Docs: Add SWTG024AS-v2.0-unmanaged version
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logicog
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### 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[^3] |
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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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# 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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[^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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[^3]: GPIO54 is used for the reset-button. `T-R85` is placed.
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Binary file not shown.
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After Width: | Height: | Size: 7.8 MiB |
Binary file not shown.
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After Width: | Height: | Size: 8.8 MiB |
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