Specifications
Device Lineup
GWU2X (USB to peripheral) and GWU2U (USB to UART)
GWU2X Function
USB device to peripheral bridge supporting SPI Master, I2C Master, JTAG Master and GPIO
GWU2U Function
USB-to-UART interface conversion for serial host communication
USB Interface
Full-speed USB device interface compatible with the Universal Serial Bus v1.1 specification
Firmware
Built-in USB protocol processing requires no device firmware programming
Conversion Logic
Built-in interface conversion processing and data buffering on-chip
Level Standards
I/O independent power supply supporting 3.3 V and 2.5 V level standards
Register Map
Configurable register map for host-side control of the bridge
Clock Control
Independent clock adjustment for each bridged interface
Host API
C/C++ API provided for host device usage
GWU2X GPIO
16 general-purpose input/output pins
GWU2X Host Ports
I2C, SPI and JTAG host interfaces with independent clock adjustment and receive buffer
FPGA Programming
Can program GOWIN FPGA products using Gowin Programmer
Use Cases
Interface conversion, multiplexing between multiple interfaces and demultiplexing to multiple interfaces
Overview
GoBridge ASSPs are highly integrated, low-power, single-chip devices for interfacing and communicating between different peripheral interface types. They are designed for converting one interface type to another, multiplexing between multiple interfaces, or demultiplexing out to several.
The first two devices in the line are the GWU2X and GWU2U. The GWU2X bridges a full-speed USB device interface to SPI Master, I2C Master, JTAG Master and GPIO, while the GWU2U provides USB-to-UART conversion. Because the USB protocol handling is built in, a designer does not need to write or flash device firmware — the bridge is configured through a configurable register map and driven through a C/C++ host API.
A frequent use is FPGA configuration and debug: the GWU2X can program GOWIN FPGA products using Gowin Programmer, and its JTAG/SPI/I2C master ports with 16 GPIOs make it useful as a compact motherboard-management or board-bring-up bridge in embedded and server-adjacent designs.
Key Benefits
Zero firmware development — on-chip USB protocol handling removes the need to write device code. Multi-protocol flexibility from a single ASSP covers SPI, I2C, JTAG, GPIO and UART roles. Independent clock adjustment and buffering per interface simplify timing across mismatched buses, and the 3.3 V / 2.5 V I/O options fit mixed-voltage boards.
Applications
FPGA configuration and in-system programming, embedded board bring-up and debug ports, industrial I/O expansion and protocol conversion, motherboard management bridging, test fixtures requiring USB-attached SPI/I2C/JTAG masters, and legacy peripheral modernization.
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