Transmit List Format

Table 5±4. Transmit Parameter List Fields

Field

Definition

Forward pointer

This 32-bit field contains a pointer to the next transmit parameter list in the chain. The

 

three LSBs of this field are ignored, as lists must always be on an eight-byte address

 

boundary. When the forward pointer is 0, the current transmit parameter list is the last

 

in the chain. The adapter processes transmit parameter lists until it reads a list with a

 

0 forward pointer. Once the frame pointed to by this list has been read into the adapter

 

and the transmit CSTAT complete field written, the transmit channel stops. A Tx EOC

 

interrupt is raised for the channel, but this is not seen by the host (because of interrupt

 

prioritization) until all outstanding Tx EOF interrupts have been acknowledged.

 

The system must update the forward pointer as a single 32-bit write operation to ensure

 

the adapter does not read the field while it is being updated. The forward pointer is read

 

at the same time as the rest of the list structure. The adapter does not alter this field.

Frame size

This 16-bit field contains the total number of bytes in the transmit frame. This field must

 

be equal to the sum of the data count fields, or an adapter check occurs.

Transmit CSTAT

This 16-bit parameter is written by the host when the transmit parameter list is created.

 

It is overwritten by the adapter to report frame transfer status. When initially written by

 

the host, this field is referred to as the transmit CSTAT request field.

 

After a frame is transferred into the adapter, the adapter overwrites this field and it is re-

 

ferred to as the transmit CSTAT complete field. This indicates completion of frame trans-

 

fer into the adapter FIFO, not frame transmission or completion of the transmit com-

 

mand.

 

The bit definitions for these two fields are defined in later tables.

Data count

This 32-bit field indicates the number of frame data bytes to be found at the address indi-

 

cated by the following data address field. There can be a maximum of ten data count/

 

data address parameters in a list.

 

If bit 31 is set to a 1, then this is the last data count in the list. A data count of 0 is only

 

permitted when it follows the last fragment in multifragment mode. This is only necessary

 

when nine or less fragments are used.

Data address

This 32-bit field contains a pointer to a fragment (or all) of the frame data in host (PCI)

 

address space. Data address is a byte address. Frame fragments can start and end on

 

any byte boundary.

 

 

5-12

Page 92 Page 94
Page 93
Image 93
Texas Instruments TNETE211 ±4. Transmit Parameter List Fields, Transmit Cstat, Mand, When nine or less fragments are used
Page 92 Page 94

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.
Top Page Image Contents