MII PHY Registers

2.5 MII PHY Registers

Figure 2±6. MII PHY Registers

Control

Status

PHY identifier

PHY identifier

AN advertisement

AN link-partner ability

AN expansion

AN next page transmit

Reserved

Reserved

Reserved

Vendor-specific registers

Vendor-specific registers

Vendor-specific registers

Register Description

0x00 PHY generic control register

0x01 PHY generic status register

0x02 PHY generic identifier (high)

0x03 PHY generic identifier (low)

0x04 Autonegotiation advertisement

0x05 Autonegotiation link-partner ability

0x06 Autonegotiation expansion

0x07 Autonegotiation next page transmit

0x08

through Reserved by IEEE 802.3 0x0F

0x10

through Vendor-specific registers 0x1F

The 802.3 standard specifies a basic set of registers that must be present. These include a control register at 0x00 and a status register at 0x01. An ex- tended set from 0x02 through 0x1F can also be implemented. Within the ex- tended set, 0x02 through 0x07 are defined and 0x08 through 0x0F are re- served. The area between 0x10 and 0x1F can be used for vendor-specific ap- plications. The basic set of registers is shown in dark gray above. The ex- tended registers are shown in lighter gray and white. The light gray registers are those defined by 802.3, and the white registers are vendor-specific. The register specification for the internal 10Base-T PHY in ThunderLAN control- lers is shown in Appendix A. We have also included the register specification for the TNETE211 100VG-AnyLAN physical media interface (PMI) in Appen- dix B.

The PHY registers are accessed to:

-Initialize the PHY, bring it in and out of reset, and isolate it from the MII

-Set PHY options, such as duplex and loopback

-Determine the type of speed and protocol supported by the PHY

-Conduct autonegotiation, if supported

-Select any vendor-specific options

The control register (GEN_ctl in ThunderLAN products) controls PHY options such as reset, loopback, duplex, and autonegotiation enable. It also powers down and isolates the PHY from the MII.

ThunderLAN Registers

2-15

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Texas Instruments TNETE100A, TNETE211, TNETE110A manual ±6. MII PHY Registers
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TNETE110A, TNETE211, TNETE100A specifications

Texas Instruments has been a leader in developing innovative semiconductor solutions, and their Ethernet PHY (Physical Layer Transceiver) family, specifically the TNETE100A, TNETE211, and TNETE110A, exemplifies this commitment to excellence. These devices are designed to address the needs of a variety of applications, ranging from industrial automation to consumer electronics.

The TNETE100A is a highly versatile Ethernet PHY capable of supporting 10/100 Mbps Ethernet connectivity. One of its main features is the low power consumption, which makes it an ideal choice for battery-operated devices. It incorporates advanced power management technologies, ensuring that the device operates efficiently while maintaining high performance. The TNETE100A also supports Auto-Negotiation, allowing for seamless communication between devices at different speeds, thereby enhancing flexibility in network configurations.

Moving to the TNETE211, this device supports 10/100/1000 Mbps Ethernet, making it suitable for high-speed networking applications. This PHY integrates features such as Energy Efficient Ethernet (EEE), which reduces power consumption during low-traffic periods, aligning with the contemporary demand for energy efficiency in networking equipment. The TNETE211 is engineered with robust EMI (Electromagnetic Interference) performance and provides multiple interface options, making it a versatile choice for embedded systems and networking applications.

The TNETE110A stands out in the lineup as a sophisticated device that supports both Fast Ethernet and Gigabit Ethernet. This PHY utilizes advanced signal processing techniques to ensure superior link robustness and performance in noisy environments. Its features include an integrated transformer driver, which simplifies PCB design and allows for compact device layouts. Additionally, the TNETE110A is designed to be fully compliant with Ethernet standards, ensuring reliable interoperability with other network components.

All three PHYs leverage Texas Instruments' expertise in integrated circuit design, resulting in low jitter and high signal integrity, essential for modern communication standards. They are optimized for a wide range of temperatures, making them suitable for harsh industrial applications. With built-in diagnostic capabilities, these devices also enable efficient fault detection and troubleshooting in network infrastructures.

In summary, the Texas Instruments TNETE100A, TNETE211, and TNETE110A are exemplary Ethernet PHY devices, each tailored to meet specific networking needs while adhering to stringent efficiency and performance criteria. Their advanced features, technologies, and reliability make them pivotal components in today's fast-paced digital landscape.
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