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Architecture

2.2Memory Map

The EMAC peripheral includes internal memory that is used to hold information about the Ethernet packets received and transmitted. This internal RAM is 2K × 32 bits in size. Data can be written to and read from the EMAC internal memory by either the EMAC or the CPU. It is used to store buffer descriptors that are 4-words (16-bytes) deep. This 8K local memory holds enough information to transfer up to 512 Ethernet packets without CPU intervention.

The packet buffer descriptors can also be placed in the internal processor memory (L2), or in EMIF memory (DDR). There are some tradeoffs in terms of cache performance and throughput when descriptors are placed in the system memory, versus when they are placed in the EMAC’s internal memory. Cache performance is improved when the buffer descriptors are placed in internal memory. However, the EMAC throughput is better when the descriptors are placed in the local EMAC RAM.

2.3Signal Descriptions

The DM646x DMSoC supports both MII interface (for 10/100 Mbps operation) and GMII interface (for 10/100/1000 Mbps) operation.

2.3.1Media Independent Interface (MII) Connections

Figure 2 shows a device with integrated EMAC and MDIO interfaced via a MII connection. The EMAC module does not include a transmit error (MTXER) pin. In the case of transmit error, CRC inversion is used to negate the validity of the transmitted frame.

The individual EMAC and MDIO signals for the MII interface are summarized in Table 1. For more information, refer to either the IEEE 802.3 standard or ISO/IEC 8802-3:2000(E).

Figure 2. Ethernet Configuration—MII Connections

System

core

EMAC

MDIO

MTCLK

MTXD(7−0)

MTXEN

MCOL

MCRS

MRCLK

MRXD(7−0)

MRXDV

MRXER

MDCLK

MDIO

Physical layer device (PHY)

2.5MHz, 25 MHz or 125 MHz

Transformer

RJ−45

SPRUEQ6–December 2007

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

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Texas Instruments TMS320DM646x manual Memory Map, Signal Descriptions, Media Independent Interface MII Connections
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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.
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