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Ethernet Media Access Controller (EMAC) Registers

5.46 Transmit Channel 0-7 DMA Head Descriptor Pointer Register (TXnHDP)

The transmit channel 0-7 DMA head descriptor pointer register (TXnHDP) is shown in Figure 86 and described in Table 85.

 

Figure 86. Transmit Channel n DMA Head Descriptor Pointer Register (TXnHDP)

31

16

 

TXnHDP

 

R/W-x

15

0

 

TXnHDP

R/W-x

LEGEND: R/W = Read/Write; -n= value after reset; -x = value is indeterminate after reset

Table 85. Transmit Channel n DMA Head Descriptor Pointer Register (TXnHDP)

Field Descriptions

Bit

Field

Value

Description

31-0

TXnHDP

0-FFFF FFFFh

Transmit channel n DMA Head Descriptor pointer. Writing a transmit DMA buffer descriptor

 

 

 

address to a head pointer location initiates transmit DMA operations in the queue for the

 

 

 

selected channel. Writing to these locations when they are nonzero is an error (except at reset).

 

 

 

Host software must initialize these locations to 0 on reset.

5.47 Receive Channel 0-7 DMA Head Descriptor Pointer Register (RXnHDP)

The receive channel 0-7 DMA head descriptor pointer register (RXnHDP) is shown in Figure 87 and described in Table 86.

 

Figure 87. Receive Channel n DMA Head Descriptor Pointer Register (RXnHDP)

31

16

 

RXnHDP

 

R/W-x

15

0

 

RXnHDP

R/W-x

LEGEND: R/W = Read/Write; -n= value after reset; -x = value is indeterminate after reset

Table 86. Receive Channel n DMA Head Descriptor Pointer Register (RXnHDP)

Field Descriptions

Bit

Field

Value

Description

31-0

RXnHDP

0-FFFF FFFFh

Receive channel n DMA Head Descriptor pointer. Writing a receive DMA buffer descriptor

 

 

 

address to this location allows receive DMA operations in the selected channel when a channel

 

 

 

frame is received. Writing to these locations when they are nonzero is an error (except at reset).

 

 

 

Host software must initialize these locations to 0 on reset.

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

SPRUEQ6–December 2007

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Texas Instruments TMS320DM646x manual TX nHDP

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.