Loongson Technology Chipsets and Bridge Chips

Loongson chipsets provide essential system functions to complement the main processors. The 7A series chipsets provide integrated graphics, memory control, and comprehensive I/O interfaces for desktop and server platforms. Bridge chips including PCIe switches enable system expansion and connectivity. SATA controllers provide storage interface expansion. USB controllers add additional USB connectivity. Ethernet PHYs and switches provide network interface options. These companion chips enable flexible system designs while reducing external component count. Reference designs demonstrate typical chipset configurations for various applications.

Select chipsets based on your system I/O requirements and expansion needs. We can provide chipset configuration guidance.

Designing a motherboard with Loongson chipsets requires understanding the processor and chipset interfaces. Reference designs and schematics are available for typical configurations. Key design considerations include power delivery for processor and chipset, DDR memory interface routing and termination, PCIe trace length matching and impedance control, and clock distribution for synchronous interfaces. Signal integrity analysis is recommended for high-speed interfaces. Thermal design must accommodate chipset power dissipation. Layout guidelines are provided in hardware design manuals. For complex designs, consider engaging with Loongson's design support services. Prototype testing with reference boards is recommended before custom design commitment.

Start with reference designs and follow hardware design guidelines. We can provide design review services and technical support.

Loongson platforms support PCIe expansion through processor-integrated controllers and bridge chips. The 3A5000 processor provides PCIe 3.0 lanes for graphics and expansion. The 7A2000 chipset provides additional PCIe lanes for I/O expansion. PCIe switch chips enable fan-out to multiple slots or devices. Typical configurations support x16 for graphics, x4 for NVMe storage, and multiple x1 lanes for peripheral expansion. PCIe 2.0 and 3.0 devices are supported depending on the specific interface. Hot-plug support depends on system implementation. Reference designs demonstrate PCIe topology options for different system requirements.

Plan PCIe topology based on expansion requirements. We can provide PCIe configuration recommendations and reference designs.

Selected Loongson chipsets are available in industrial temperature grades for harsh environment applications. The 7A1000 chipset is available in -40°C to +85°C industrial grade for industrial motherboard designs. Bridge chips and controllers may have industrial grade options depending on the specific device. Industrial grade devices undergo additional testing and screening to ensure reliability across the temperature range. For automotive or specialized applications, discuss specific temperature requirements with our technical team. Lead times for industrial grade components may be longer than commercial grade. Volume commitments may be required for industrial grade procurement.

Specify industrial grade for harsh environment applications. Contact us for industrial grade availability and procurement options.

Loongson chipset power consumption varies by device and configuration. The 7A2000 desktop chipset typically consumes 5-10W depending on active interfaces and graphics load. The 7A1000 embedded chipset consumes 2-5W in typical applications. Bridge chips and controllers have lower power consumption, typically 1-3W. Power management features allow dynamic power reduction when interfaces are idle. Thermal design should accommodate maximum power dissipation under worst-case conditions. Power consumption scales with the number of active interfaces and their operating speeds. Reference designs include power analysis for typical configurations.

Consider chipset power in system thermal and power supply design. We can provide power analysis for your specific configuration.