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SWTG024AS

SWTG024AS has at least 4 variants that look the same.

Variants are managed and a unmanaged version. But both have pcb version v1.0 and v2.0. Also the RJ45 connectors can be all plastic/non-shielded or with metal shielding.

Brands

Brand Type Managed PCB PCB Label Flash Chip RTL
LIANGUO SWTG024AS No SWTG024AS-v2.0-17452 CM-23-11-2336 023-17453 512 KiB 8272
Horaco ZX-SWTG124AS Yes SWTG024AS-v2.0 ??? ??? 8272
Xikestore SKS3200M-4GPY2XF Yes SWTG024AS-v1.0 CM-23-08-2043 023-16721 2048 KiB 8272
Sodola SL-SWTG124AS-D Yes SWTG024AS-v2.0-17452 ??? 2048 KiB 8272

PCB

SWTG024AS-v2.0 managed vs unmanged

Changes I found with my board vs Managed version of the PCB.

Bottom

  • R105: Installed, goes to R10-PullDown SFP2 (J2) -> TX-DISABLE
  • R85: Not Installed (Connected to K1 Reset Button)
  • R90: Not installed (System Led)
  • LED3: Not installed (System Led)

Top

  • K1: Not installed (Reset Button)
  • R95: Installed (SFP2 (J2) signal RX-LOS), means that the managed-version can´t use the RX-LOS function.
  • R270: Installed (SFP1 (J4) signal RX-LOS), same here as above.
  • R268: Installed (SFP2 (J2) signal TX-DISABLE, but R262 200R pull-down is to high to drive by the SOC, needs mod!)
  • U5: Flash is only 512 KiB instead of 2/4 MiB.

Notes

  • TX-Disable-SFP2 and Button K1 share the same GPIO pin via R105 and R85. 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. We need to make a Best-BOM variant so we can use all the featues.

Connectors

Port overview

┌────────────────────────────────────────────────────────────────────────────────────────┐
│                                                       ┌──────────┐        ┌──────────┐ │
│     ┌─────────┐ ┌─────────┐ ┌─────────┐ ┌─────────┐   │ SFP (J4) │        │ SFP (J2) │ │
│     │  RJ45   │ │  RJ45   │ │  RJ45   │ │  RJ45   │   │ PORT   5 │        │ PORT   6 │ │
│     │  PORT 1 │ │  PORT 2 │ │  PORT 3 │ │  PORT 4 │   │ MAC    8 │        │ MAC    3 │ │
│  O  │  MAC  4 │ │  MAC  5 │ │  MAC  6 │ │  MAC  7 │   │ SerDes 1 │        │ SerDes 0 │ │
│ RST └─────────┘ └─────────┘ └─────────┘ └─────────┘   └──────────┘        └──────────┘ │
└────────────────────────────────────────────────────────────────────────────────────────┘

J4

  • Location: Left SFP connector J4.
  • Connected to: 10GMAC number 8, second SerDes.
J4 SFP1 PINs Signal Component GPIO Notes
2 TX_FAULT B-R262 ---
3 TX_DISABLE B-R263, T-R268 GPIO38 R262 = Pull-down 200R
4 MODDEF2 – SDA B-R261, T-R266 GPIO39
5 MODDEF1 – SCL B-R260, T-R267 GPIO40 Shared with both SFP
6 MODDEF0 – PRESENT B-R259, T-R296 GPIO30
7 RATE SEL B-R257 ---
8 LOS B-R258, T-R270 GPIO37
9 TO? B-R256 ---

J2

  • Location: Right SFP connector J2.
  • Connected to: 10GMAC number 3, first SerDes.
J2 SFP2 PINs Signal Component GPIO Notes
2 TX_FAULT B-R70 ---
3 TX_DISABLE B-R10, B-R105-R, T-R88-L GPIO54 R10 = Pull-down 200R
4 MODDEF2 – SDA B-R26, T-R85 GPIO41
5 MODDEF1 – SCL B-R15, T-R87 GPIO40 Shared with both SFP
6 MODDEF0 – PRESENT B-R14, T-R89 GPIO50
7 RATE SEL B-R12 ---
8 LOS B-R13, T-R95 GPIO51
9 TO? B-R11 ---

Note: component numbering <L>-<REFDES>-<SIDE>

  • L: Layer, T=Top, B=Bottom
  • REFDEES: full silkscreen like R123
  • 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, 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, Slave SCK/SCL/MDC/EE_SCL
2 GND ---
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
1 GPIO31 U0TXD (Output)
2 GND
3 GPIO32 U0RXD (Input)
4 3V3
Note: 1 pin is square shaped.

T8

T8 pin what Signal
1 GPIO46
2 GND
3 GPIO48
4 3V3
5 GPIO47
6 GPIO49
Note: 1 pin is square shaped.

Reset ciruit

Cmp Function
T-R78 33k PullUp
T-D3 Discharge Diode
T-C187 RC-Delay

Reset-line found at T-D3-D active-low.

GPIO

HEX VAL. GPIO Component What GPIO Component What
00000001 GPIO00 T-C151-T, T-R28-T, T-R29-T ? GPIO32 T-R143-R U0RXD
00000002 GPIO01 T-C152-T ? GPIO33
00000004 GPIO02 T-C153-T ? GPIO34
00000008 GPIO03 T-R33-T ? GPIO35
00000010 GPIO04 B-C155 ? GPIO36 T-R88-L, T-R84-B Optional SFP2 TX-DISABLE1 , Reset
00000020 GPIO05 B-C156 ? GPIO37 SFP1-8, T-R270 SFP-LOS
00000040 GPIO06 T-C157-T ? GPIO38 SFP1-3, T-R268 SFP1 TX-DISABLE1
00000080 GPIO07 T-C158-T, R165 ? GPIO39 SFP1-4, T-R266 I2C-SDA4
00000100 GPIO08 GPIO40 SFP2-5, T-R87; SFP1-5, T-R267; I2C-SCL
00000200 GPIO09 SFP2-LED, T-R36-T LED-SFP2 GPIO41 SFP2-4, T-R85 I2C-SDA
00000400 GPIO10 GPIO42 U8-P6, T-R124 SPI-MEMORY, CLK
00000800 GPIO11 LEDx2 GPIO43 U8-P5, T-R127 SPI-MEMORY, DI,IO0
00001000 GPIO12 LEDx2 GPIO44 U8-P2, T-R128 SPI-MEMORY, DO,IO1
00002000 GPIO13 PORT1-LED-GREEN LEDx2 GPIO45 U8-P1, T-R123 SPI-MEMORY, CS
00004000 GPIO14 PORT1-LED-YELLOW LEDx GPIO46 T8-1, T-R188 ?
00008000 GPIO15 LEDx2 GPIO47 T8-5, T-R190 ?
00010000 GPIO16 PORT2-LED-GREEN LEDx2 GPIO48 T8-3, T-R189 ?
00020000 GPIO17 PORT2-LED-YELLOW LEDx GPIO49 T8-6, T-R190 ?
00040000 GPIO18 LEDx2 GPIO50 SFP2-6, T-R89 SFP-DETECT
00080000 GPIO19 PORT3-LED-GREEN LEDx2 GPIO51 SFP2-8, T-R95 SFP-LOS
00100000 GPIO20 PORT3-LED-YELLOW LEDx GPIO52
00200000 GPIO21 LEDx2 GPIO53
00400000 GPIO22 PORT4-LED-GREEN LEDx2 GPIO54 SFP2-3, T-R105-L SFP2 TX-DISABLE1 or via T-R85 to RESET3 , T-R84-T
00800000 GPIO23 PORT4-LED-YELLOW LEDx GPIO55 T-R78-B
01000000 GPIO24 SFP1-LED-J4, T-R35 LED-SFP1 GPIO56
02000000 GPIO25 GPIO57
04000000 GPIO26 ? LEDx GPIO58
08000000 GPIO27 R44L ? GPIO59
10000000 GPIO28 LED-SYSTEM, T-R50-R LED-SYSTEM GPIO60
20000000 GPIO29 T-R187-R GPIO61
40000000 GPIO30 SFP1-6, T-R269 SFP-DETECT GPIO62
80000000 GPIO31 T-R144-R U0TXD GPIO63

LEDs

NAME COMPONENTS GPIO Active
SYSTEM T-R50-R (PU-4k2), T-R49-L, T-C185-L, B-R90 GPIO28 Low
SFP1 T-R35-L (PU-3k9), T-R34-L, T-C179-L GPIO24 Low
SFP2 T-R36-T (PD-4k0) GPIO09 High
PORT1-LED-YELLOW GPIO14 Low
PORT2-LED-YELLOW GPIO17 Low
PORT3-LED-YELLOW GPIO20 Low
PORT4-LED-YELLOW GPIO23 Low

Power supply

Board has two supply rails. 0.95 and 3.3 volt.

0.95 Core Voltage.

Voltage is made by a Richtek RT8120A Buck converter. 0.95V must be within 3%.

3.3 Voltage

Voltage is crated by a TMI3244T Buck converter. 3.3V must be within 4.5%. Chip can deliver up to 4A and the sweetspot is at 1A. So higher power SFP-modules should work.

  1. Only on the unmanaged verions are R10 and R268 placed. But the very low pull-down resistor R10 and R262 prevent to SOC to drive does pins. A mod is needed. ↩︎

  2. 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. ↩︎

  3. GPIO54 is used for the reset-button. T-R85 is placed. ↩︎

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