PCI Configuration Space

-Set up the PCI bus. Several PCI bus options can be selected through these registers, including latency and grant. (Refer to PCI Local Bus Spec- ification, subsection 3.5)

-Map a BIOS ROM using the BIOS ROM base address register

Many of the registers in the PCI configuration space are accessed with PCI BIOS calls. Refer to the PCI Local Bus Specification, chapter 6, for the com- mands supported by your specific PCI BIOS. Some operating systems (O/Ss) provide BIOS call support. Your operating system's user's guide contains these specific BIOS support routines.

The PCI specification requires that a bus-resident device respond to bus cycle codes reserved for reading and writing to configuration space. See the PCI Local Bus Specification document for more information on how these short, slot-dependent address spaces appear to the host processor. The shaded registers in Figure 2±3 can be autoloaded from an external serial EEPROM.

Check the following before accessing the PCI configuration space:

-Ensure that there is a PCI BIOS present or other support for BIOS calls.

-Ensure that the BIOS is the right revision.

-Use a PCI BIOS call to find all attached devices on the PCI bus. Make sure that you are talking to the right device on the PCI bus.

Attaching a pullup resistor to the EDIO pin allows the board designer to auto- matically read an EEPROM after reset to determine the contents of the first eight bytes, shown shaded below. If the host attempts to read any of the config- uration space during the time the adapter is reading the EEPROM, Thunder- LAN rejects the request by signaling target-retry.

Figure 2±3. Configuration EEPROM Data Format

Vendor ID LSByte

Vendor ID MSByte

Device ID LSByte

Device ID MSByte

Revision

Subclass

Min_Gnt

Max_Lat

Checksum

Address

C0h

C1h

C2h

C3h

C4h

C5h

C6h

C7h

C8h

ThunderLAN Registers

2-5

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Texas Instruments TNETE110A, TNETE211, TNETE100A manual ±3. Configuration Eeprom Data Format
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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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