PCI Configuration Registers

The first bit written to or read from the EEPROM is the most significant bit of the byte, such as data(7). Therefore, writing the address C0h is accomplished by writing a 1 and six 0s.

ThunderLAN expects data to be stored in the EEPROM in a specific format. Nine bytes in the EEPROM are reserved for use by the adapter, starting with C0h, as shown below. The contents of the remaining 247 bytes are undefined. The EEPROM can also be read from or written to by driver software through the NetSio register. The shaded registers in Figure A±1 can be autoloaded from an external serial EEPROM.

Figure A±2. 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

Any accesses to the adapter's configuration space during autoload are re- jected with a target retry. The checksum byte is an 8-bit cumulative XOR of the eight shaded bytes, starting with an initial value of AAh. The adapter uses this checksum to validate the EEPROM data. If the checksum fails, the config- uration registers are set to their default (hardwired) values instead.

Checksum = AAh

XOR Data(0) XOR Data(1) XOR Data(2) XOR Data(3)

XOR Data(4) XOR Data(5) XOR Data(6) XOR Data(7);

Where XOR is a bitwise exclusive OR of the bytes.

A.1.2 PCI Vendor ID Register (@ 00h) Default = 104Ch

This register holds the adapter vendor ID. This register is loaded from an exter- nal serial EEPROM on the falling edge of PCI reset, during autoconfiguration. Should autoconfiguration fail (bad checksum), then this register is loaded with the TI vendor ID of 104Ch instead.

A.1.3 PCI Device ID Register (@ 02h) Default = 0500h

This register holds the adapter device ID. The register is loaded from an exter- nal serial EEPROM on the falling edge of PCI reset, during autoconfiguration.

A-4

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Texas Instruments TNETE211 PCI Vendor ID Register @ 00h Default = 104Ch, PCI Device ID Register @ 02h Default = 0500h
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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.

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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.

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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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