www.ti.com

Ethernet Media Access Controller (EMAC) Registers

CRC errors have no effect on this statistic.

5.50.21 Transmit Multiple Collision Frames Register (TXMULTICOLL)

The total number of frames transmitted on the EMAC that experienced multiple collisions. Such a frame is defined as having all of the following:

∙Was any data or MAC control frame destined for any unicast, broadcast, or multicast address

∙Was any size

∙Had no carrier loss and no underrun

∙Experienced 2 to 15 collisions before being successfully transmitted. None of the collisions were late.

CRC errors have no effect on this statistic.

5.50.22 Transmit Excessive Collision Frames Register (TXEXCESSIVECOLL)

The total number of frames when transmission was abandoned due to excessive collisions. Such a frame is defined as having all of the following:

∙Was any data or MAC control frame destined for any unicast, broadcast, or multicast address

∙Was any size

∙Had no carrier loss and no underrun

∙Experienced 16 collisions before abandoning all attempts at transmitting the frame. None of the collisions were late.

CRC errors have no effect on this statistic.

5.50.23 Transmit Late Collision Frames Register (TXLATECOLL)

The total number of frames when transmission was abandoned due to a late collision. Such a frame is defined as having all of the following:

∙Was any data or MAC control frame destined for any unicast, broadcast, or multicast address

∙Was any size

∙Had no carrier loss and no underrun

∙Experienced a collision later than 512 bit-times into the transmission. There may have been up to 15 previous (non-late) collisions that had previously required the transmission to be reattempted. The late collisions statistic dominates over the single, multiple, and excessive collisions statistics. If a late collision occurs, the frame is not counted in any of these other three statistics.

CRC errors, carrier loss, and underrun have no effect on this statistic.

5.50.24 Transmit Underrun Error Register (TXUNDERRUN)

The number of frames sent by the EMAC that experienced FIFO underrun. Late collisions, CRC errors, carrier loss, and underrun have no effect on this statistic.

5.50.25 Transmit Carrier Sense Errors Register (TXCARRIERSENSE)

The total number of frames on the EMAC that experienced carrier loss. Such a frame is defined as having all of the following:

∙Was any data or MAC control frame destined for any unicast, broadcast, or multicast address

∙Was any size

∙The carrier sense condition was lost or never asserted when transmitting the frame (the frame is not retransmitted)

CRC errors and underrun have no effect on this statistic.

SPRUEQ6–December 2007

Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)

129

Submit Documentation Feedback

Page 128 Page 130
Page 129
Image 129
Texas Instruments TMS320DM646x manual Transmit Multiple Collision Frames Register Txmulticoll
Page 128 Page 130

TMS320DM646x specifications

The Texas Instruments TMS320DM646x series is a powerful family of digital media processors designed to handle high-performance applications in video, imaging, and audio processing. These devices leverage advanced technologies to deliver efficient processing capabilities for a variety of embedded systems, making them ideal for multimedia solutions.

At the core of the TMS320DM646x is the versatile DSP architecture, which optimizes performance for digital signal processing tasks. This architecture allows for real-time processing, enabling the devices to handle complex algorithms necessary for image and video compression, thereby meeting the rigorous demands of modern multimedia applications.

One of the standout features of the TMS320DM646x series is its dual-core architecture. This consists of a Digital Signal Processor (DSP) alongside an ARM-based application processor. The DSP is predominantly employed for critical processing tasks, allowing it to execute high-throughput data streams efficiently, while the ARM processor manages control tasks and user interfaces. This division of labor enhances overall system performance and responsiveness.

The series supports a wide range of video formats and technologies, including HD video encoding and decoding, which accommodates HD resolution content essential for today’s multimedia applications. Furthermore, the TMS320DM646x integrates hardware accelerators for video compression standards such as H.264 and MPEG-4, which significantly reduce the processing burden on the CPU, resulting in lower power consumption and higher efficiency.

Networking capabilities are another significant feature of the TMS320DM646x. With support for Ethernet, the device can handle streaming media applications and connectivity, facilitating the transmission of high-quality audio and video over the internet. This connectivity is crucial for developing robust IPTV and streaming solutions.

Power management is a primary focus in the design of the TMS320DM646x series. The processors are built to operate efficiently with minimal power consumption, making them suitable for portable and battery-operated devices. The low power characteristics do not compromise performance, enabling high computational capabilities while maintaining energy efficiency.

Overall, the Texas Instruments TMS320DM646x series offers an exceptional combination of processing power, advanced multimedia capabilities, and energy efficiency. It optimally supports a wide array of applications, from video processing and image analysis to audio encoding. This comprehensive feature set, along with its robust architecture, positions the TMS320DM646x as a leading choice for developers in the digital media space.
Top Page Image Contents