1.7 KiB
Hisource Hi-K0402WS
Following is documentation for unmanaged switch marked as Hi-K0402WS.
Original software is running UART on 9600 baud rate.
Using SPI clamp in-board is the only method for initial installation.
The board has two flash chips BY25Q16BS with 16M-bit size. The front switch, switches between the two flash chips.
These can be programed independently by using said switch - so it is e.g. possible to run the original and new firmware in parallel.
Label specifications
- Name: 2.5G Ethernet Switch
- Model: Hi-K0402WS
- Ports:
- 4 × RJ45: 10/100/1000/2500 Mbps
- 2 × SFP: 1000 / 2500 / 10000 Mbps
What works (expected from label + similar devices)
- All four 2.5GBASE-T RJ45 ports at 10/100/1000/2500 Mbps
- Both SFP ports supporting 1G, 2.5G and 10G modules
- LEDs
PCB overview
Board markings
- Top silkscreen: PCB-KO4022W-V3.0 / DIP-KO4022WS-V3.0
Top side
Bottom
T2, serial console
J2 pin |
Signal |
|---|---|
| 1 | 3V3 |
| 2 | RX (Input) |
| 3 | TX (Output) |
| 4 | GND |
Power supply
Input power is delivered via barell plug, 12V 1A adapter was provided.
Board has two supply rails. 0.95 and 3.3 volt.
0.95 Core Voltage
Voltage is made by a Techcode TD1720 .
3.3 Voltage
Voltage is created by chip marked as Techcode TD1720.
There seems to have been a miscalculation when choosing the inductor and the device is ~25% more efficient with an 5V power supply.