KS8721B

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KS8721B is a high-speed, low-power Ethernet physical layer (PHY) transceiver used in Local Area Networks (LANs) applications. It is used to interface with the MAC layer of an Ethernet network while providing low-level signal translation and protocol support. KS8721B is a full-featured integrated circuit (IC) which integrates the SONET OC-3/STM-1/Ethernet PHY layer, clocking and synchronous optical network (SONET) functions, and a 10/100 Mbps IEEE 802.3 CSMA/CD MAC controller. This article will discuss the application field and working principle of KS8721B.

Application Field of KS8721B

The KS8721B is intended for use in a range of applications, including high-speed communication networks, local area networks (LANs), wireless LANs, home Networking and Automated Manufacturing Systems. The KS8721B is well suited for use in the following scenarios:

• High-speed communication networks, such as SONET/Ethernet, WANs and MANs.
• Home networking, including cable TV networks, networking and streaming media.
• Industrial automation, including process control and industrial sensor networks.
• Wireless and mobile networks, including Wi-Fi, Bluetooth, and ZigBee.
• Automotive networks, including navigation systems and entertainment systems.

The KS8721B is designed to minimize power consumption and reduce the complexity of local area networks and home networks. The device is ideal for embedded systems that require a low-cost and low-power IEEE 802.3 transceiver.

Working Principle of KS8721B

The KS8721B is an IEEE 802.3-compliant 10/100 Mbps transceiver with integrated physical layer (PHY) and media access control (MAC) control capabilities. The device supports full-duplex and half-duplex operation in both 10 Mbps and 100 Mbps modes. The KS8721B features integrated phase-locked loop (PLL) circuitry, allowing for synchronous data recovery (SDR) operation. The integrated SDR provides for the synchronization of clock frequencies between the LAN host and the device.

The KS8721B supports full-duplex operation in 10 Mbps and 100 Mbps modes. The device requires only two pins to provide full-duplex communication. Additionally, the KS8721B supports MDIO/MDC communication with the network host, which allows for remote monitoring and configuration of the device. The integrated SDR circuitry provides for the synchronization of clock frequencies between the host and the device.

The KS8721B also supports jumbo frames up to 9.6 kB for faster data transfer in high-speed networks. The device implements Automatic Address Recognition (AAR) to detect and validate frames, and supports Automatic Packet Retry (APR) to ensure reliable data transfer. Additionally, the device supports Error Detection and Correction (EDC) to ensure accurate data communication.

The KS8721B implements two types of ports: a Media Independent Interface (MII) port, which allows for communication with the network host, and a Physical Medium Dependent (PMD) port, which allows for communication with the physical media. The KS8721B also supports flow control via hardware and software including pause frames, backpressure, and packet discarding. Additionally, the device is compliant with the IEEE 1588V2 standard for time synchronization.

Conclusion

In conclusion, the KS8721B is an integrated 10/100 Mbps Ethernet physical layer and MAC layer transceiver used in LAN applications. The device supports full-duplex and half-duplex operation in both 10 Mbps and 100 Mbps modes, and features integrated phase-locked loop (PLL) circuitry for synchronous data recovery (SDR) operation. The device also supports jumbo frames and provides hardware and software flow control. Additionally, the device is compliant with the IEEE 1588V2 standard. The KS8721B is well suited for use in high-speed communication networks, home networking, wireless and mobile networks, industrial automation, and automotive networks.

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