KSZ8721BLI-TR IC

Technical Specifications of KSZ8721BLI-TR

Datasheet	KSZ8721BLI-TR datasheet
Category	Integrated Circuits (ICs)
Family	Interface – Drivers, Receivers, Transceivers
Manufacturer	Microchip Technology
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Type	Transceiver
Protocol	MII, RMII
Number of Drivers/Receivers	1/1
Duplex	Full
Receiver Hysteresis	–
Data Rate	–
Voltage – Supply	3 V ~ 3.6 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	48-LQFP
Supplier Device Package	48-LQFP (7×7)

Introduction to KSZ8721BLI-TR

The KSZ8721BLI-TR is an Ethernet receiver with a lot of built-in features that can be used in a variety of networking situations. It offers a safe and effective way to connect items to an Ethernet network. The KSZ8721BLI-TR has high-speed data communication capabilities thanks to its advanced features and flexible interfaces. It can be used for a wide range of uses, such as industrial automation, home networking, automotive systems, and more.

The KSZ8721BLI-TR receiver is compatible with a wide range of Ethernet controllers because it works with both Full Media Independent Interface (MII) and Reduced Media Independent Interface (RMII) standards. This gives creators the freedom to choose the interface that works best for their system, whether it’s MII with its higher pin count and faster data throughput or RMII with its lower pin count and smaller board space needs.

KSZ8721BLI-TR Features

• Input/Output Voltage Range of 2.5V to 3.3V, CMOS Design
• Power Consumption: 340 mW (including output driver current) from a single 3.3V power supply with an integrated voltage regulator
• IEEE 802.3u Standard Compliance Complete
• Includes both full and reduced MII (RMII) support.
• Features far-end fault detection and works with 10BASE-T, 100BASE-TX, and 100BASE-FX.
• Power-saving and power-down modes are supported.
• MII Serial Management Ports with an External Control Pin Allow Configuration
• The 10/100 Mbps speed and the full-duplex and half-duplex modes can be automatically or manually selected.

KSZ8721BLI-TR Functional Description

● 100BASE-TX transmit

The 100BASE-TX broadcast function encrypts and sends MLT-3 data. It also changes data from parallel to serial and from NRZ to NRZI. The hardware starts with a parallel-to-serial converter, which takes the 4-bit nibbles at 25 MHz and changes them into a serial bit stream at 125 MHz. When the data comes at the leading edge of the TXC signal, it is given a time stamp. After the data has been changed from NRZ to NRZI and serialized, it is sent out of the MLT3 current output. For a ratio of 1:1, the output current is set by an external 1%, 6.49-k resistor. The average rise and fall times of 4 ns meet the requirements of the ANSI TP-PMD standard for overshoot, amplitude balance, and timing jitter. The waveform 10BASE-T output driver is also part of the 100BASE-TX driver.

● 100BASE-TX Receive

The 100BASE-TX receive function includes adaptive equalization, direct current (DC) restore, MLT-3 to NRZI conversion, data and clock recovery, NRZI-to-NRZ conversion, and serial-to-parallel conversion. First, the equalization filter at the receiver fixes the inter-symbol interference (ISI) that can happen with twisted-pair cables. Due to the linear link between amplitude loss, phase distortion, and cable length, the equalizer’s settings must be changed to get the most out of it. In this setup, the variable equalization will first try to figure out how strong the incoming signal is by comparing it to some known qualities of the cable. Then, it will tune itself for the best possible performance.

This is an ongoing process that can change to fit its surroundings, such as if the temperature changes. After the signal is evened out, a DC restoration and data transfer block come next. With the help of the DC restoration circuit, the base line can move less and the dynamic range can be improved.

With the differential data translation circuit, the MLT3 data is changed back to NRZI. Over time, the rules for making cuts also changed. The sides of the NRZI signal are used by the clock recovery circuit to figure out the 125 MHz clock. When the clock is found, it can be used to change the NRZI output into the more portable NRZ format. The last step is to change the serial NRZ data into parallel 4B bits.

At the falling edge of RCK25, the 4B bits are no longer valid, and at the rising edge, the 25 MHz RXC is valid for the receiver. In the absence of correct data, both the TXC and RXC clocks will keep going while the clock recovery circuit is locked to the 25 MHz reference clock.

● 10BASE-T Transmit

When the TXEN (transmit allow) signal goes high, data is encoded and sent. As long as2.5 volts. TXEN is high, the KSZ8721BL/SL continues to process and send data. When TXEN goesinformation, the info is no longer sent. If the last bit is 0, the last change happens at the edge of the bit cell. If the last bit is 1, the last change happens in the middle of the bit cell. The output driver is built into the 100BASE-T driver so that the same magnetics can be used for transmission. They are wave-shaped on the inside and have outputs with a normal amplitude of 2.5V. When the fundamental is driven by an all-ones, Manchester-encoded signal, the harmonics are at least 27 dB below the fundamental.

● 10BASE-T Receive

When the TXEN (transmit allow) signal goes high, data is encoded and sent. As long as2.5 volts. TXEN is high, the KSZ8721BL/SL continues to process and send data. When TXEN goesinformation, the info is no longer sent. If the last bit is 0, the last change happens at the edge of the bit cell. If the last bit is 1, the last change happens in the middle of the bit cell. The output driver is built into the 100BASE-T driver so that the same magnetics can be used for transmission. They are wave-shaped on the inside and have outputs with a normal amplitude of 2.5V. When the fundamental is driven by an all-ones, Manchester-encoded signal, the harmonics are at least 27 dB below the fundamental.

● SQE and Jabber Function (10BASE-T Only)

After each message is sent with 10BASE-T, a short pulse is sent out on the COL pin. This is called a SQE test, and it is a test of the 10BASE-T send/receive link. If TXEN is high for more than 20 ms, the 10BASE-T transmission is turned off, and COL goes high. If TXEN stays low for more than 250 ms, the 10BASE-T transmission is turned back on, and COL goes low.

● Carrier Sense/Receive Data Valid (CRS_DV)

When the carrier is found, CRS_DV is set at a different time depending on the working mode. That is, in 10BASE-T mode, the carrier is found when squelch is passed, and in 100BASE-X mode, it is found when two zeros in 10 bits that are not next to each other are found. When there is a loss of carrier, CRS_DV is turned off at the same time as REF_CLK. As long as the carrier criteria are met, CRS_DV is set from the first recovered di-bit of the frame until the last recovered di-bit of the frame. It is set to zero before the first REF_CLK that comes after the last di-bit.

Conclusion

The KSZ8721BLI-TR transceiver is a very flexible Ethernet component that works with many different ports and has advanced features. With its high-speed data transfer, ability to auto-negotiate, and power-saving features, it can connect a wide range of networking apps quickly and reliably. By following the rules in this guide, designers will be able to combine the transceiver well and get the most out of it. The KSZ8721BLI-TR is still a good choice for networking projects because it makes it easy to share data and improves system speed. Get in touch with ICRFQ to learn more or place an order.

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