KSZ8794CNXCC-TR

Controllers Overview

The KSZ8794CNXCC-TR is a Layer 2-managed, four-port Ethernet switch manufactured by Microchip Technology. It integrates three 10/100BASE-T/TX MAC/PHY transceivers and one Gigabit GMAC with selectable RGMII, MII, or RMII interfaces for uplink connectivity. The device features a non-blocking store-and-forward switch fabric with a 64 KB frame buffer RAM and a 1024-entry forwarding table. It supports IEEE 802.3/802.3u standards, including Energy Efficient Ethernet (EEE) and Wake-on-LAN (WoL). The component operates within a commercial temperature range of 0°C to +70°C and utilizes a lead-free, RoHS-compliant 64-pin QFN package.

Controllers Feature Summary

• Integrated Layer 2 management capabilities including VLAN support, ACL filtering, and QoS prioritization across four priority queues.
• Robust PHY ports featuring HP Auto MDI/MDIX crossover support and LinkMD cable diagnostic capabilities.
• Flexible MAC and GMAC port configuration supporting RGMII, MII, and RMII interfaces with tail tagging mode.
• Advanced power management features such as Energy Detect Power-Down (EDPD) and per-port software power-down.

Controllers Applications

• Industrial Ethernet Applications employing IEEE 802.3-compliant MACs
• VoIP Phone systems
• Set-Top/Game Box devices
• Broadband Gateway/Firewall/VPN implementations
• Wireless LAN Access Point + Gateway configurations

Controllers Procurement Notes

Verify the specific ordering suffix against official datasheets to confirm temperature grade and packaging type. Ensure compatibility with required voltage levels for VDDIO and analog supplies. Confirm that the selected variant matches the intended application environment specifications before finalizing procurement orders.

Controllers Selection Notes

Select this component when a managed switch solution is required with integrated copper transceivers and a Gigabit uplink interface. Evaluate the need for specific management protocols like SPI or MIIM access. Consider the thermal requirements and ensure the chosen package variant aligns with the operational temperature range of the target system design.

Controllers Part Context

The KSZ8794CNX belongs to the KSZ8794 series of integrated Ethernet switches from Microchip Technology. This family focuses on cost-sensitive applications requiring high integration of MAC, PHY, and switching functions. The CNX designation typically indicates specific manufacturing revisions or package variations within the broader product line.

Controllers Replacement Considerations

Consult official Microchip documentation for direct pin-to-pin replacements or functional equivalents within the KSZ87xx series. Verify interface compatibility and register mapping differences if substituting with other managed switch ICs.

Controllers FAQ

What interfaces are supported by the fourth port (GMAC4)?

Port 4 supports RGMII, MII, and RMII interfaces, allowing flexible connection to host processors or upstream network equipment.

Does the KSZ8794CNX support Energy Efficient Ethernet?

Yes, the device supports IEEE P802.3az Energy Efficient Ethernet (EEE) to reduce power consumption in transceivers during low-power idle states.

How is the Port 4 interface mode configured?

The interface mode for Port 4 can be configured via strap-in pins (LED3_0 and LED3_1) during reset or through internal control registers.