MII-Enhanced Interrupt Event Feature

generated under host software control and is used to latch the MDIO pin on the rising edge.

The ThunderLAN architecture expands the use of these two pins to allow the attached PHY to interrupt the host using ThunderLAN. The clock cycle at the end of a transaction on the MDIO signal is used to disable the PMI from driving MDIO after a register read (the quiescent cycle). The interrupt is signaled to the host on MDIO one clock cycle after this, for the half of the cycle when MDCLK is high.

Figure 7±4. Assertion of Interrupt Waveform on the MDIO Line

MDCLK

Cycle

MDIO

D15

D16

QCYC

MINT

QCYC = Quiescent

Since the Interrupt from the PHY is an open drain function, the PMI drives the MDIO low prior to the falling edge that starts the start of frame (SOF) portion of the management interface frame. During sync cycles the PHY releases the interrupt on the MDIO to allow the management entity to pull the MDIO high so a sync cycle is seen. In the diagram below, only one sync cycle is displayed, but all 32 bits of the sync cycle are the same. On the ThunderLAN side of the MII, a pullup is used to pull the MDIO signal high (no interrupt pending). The value is such that the rising edge is less than 200 ns.

Figure 7±5. Waveform Showing Interrupt Between MII Frames

MDCLK

MDIO

Bit 1

Bit 0

Sync

End of transaction

SOF

R/W

Clear IntInHibit

 

 

Interrupt detected

 

Open collector off due to MDCLK seen low

 

 

New management transaction

 

7-6

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Texas Instruments TNETE110A, TNETE211, TNETE100A manual Qcyc Mint, Mdclk Mdio, Sof
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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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