Video Input Filtering

VCTL2 is a VSYNC (vertical sync) input, then a long field is always detected. (Even if VCYSTOPn is set to the last active line, VCOUNT usually increments past VCYSTOPn + 1 while it counts the vertical front porch lines that occur prior to VSYNC active.)

3.5 Video Input Filtering

The video input filter performs simple hardware scaling and resampling on incoming 8-bit BT.656 or 8-bit Y/C data. Filtering hardware is always disabled during 10-bit or raw data capture modes. For proper filter operation, the channel’s EXC bit in VCxCTL must be cleared to 0 (embedded timing refer- ence codes used) and the CAPEN input must not go inactive during the active video window.

3.5.1Input Filter Modes

The input filter has four modes of operation: no-filtering, ½ scaling, chrominance resampling, and ½ scaling with chrominance resampling. Filter operation is determined by the CMODE, SCALE, and RESMPL bits of VCxCTL.

Table 3–10 shows the input filter mode selection. When 8-bit BT.656 or Y/C capture operation is selected (CMODE = x00), scaling is selected by setting the SCALE bit and chrominance resampling is selected by setting the RESMPL bit. If 8-bit BT.656 or Y/C capture is not selected (CMODE ≠ x00), filtering is disabled.

Table 3–10. Input Filter Mode Selection

 

VCxCTL Bit

 

 

CMODE

RESMPL

SCALE

Filter Operation

 

 

 

 

x00

0

0

No filtering

x00

0

1

½ scaling

x00

1

0

Chrominance resampling (full scale)

x00

1

1

½ scaling with chrominance resampling

x01

x

x

No filtering

x10

x

x

No filtering

x11

x

x

No filtering

 

 

 

 

3-26

Video Capture Port

SPRU629

Page 87 Page 89
Page 88
Image 88
Texas Instruments TMS320C64x DSP Video Input Filtering, Input Filter Modes, Input Filter Mode Selection, Filter Operation
Page 87 Page 89

TMS320C64x DSP specifications

The TMS320C64x DSP family from Texas Instruments represents a significant milestone in the realm of digital signal processing. Launched as part of the C6000 series, the C64x DSPs are designed for high-performance applications requiring intensive computational capabilities, such as telecommunications, audio processing, video processing, and industrial control systems.

One of the standout features of the TMS320C64x DSP is its VLIW (Very Long Instruction Word) architecture, which allows for an exceptionally high level of parallelism. This architecture enables multiple instructions to be executed simultaneously, boosting the overall throughput and allowing for complex data processing tasks to be completed more quickly than with conventional DSPs.

The C64x DSPs also boast an impressive clock frequency range, typically up to 1 GHz, delivering substantial computational power for real-time processing goals. Additionally, these processors feature extensive on-chip memory, including L1 and L2 cache, which significantly enhances data access speeds and helps reduce bottlenecks during high-demand processing tasks.

Another key characteristic of the TMS320C64x family is its support for advanced instruction sets optimized for specific applications. These include SIMD (Single Instruction, Multiple Data) capabilities, allowing for efficient handling of large datasets often involved in multimedia processing or complex signal manipulation.

For connectivity, these DSPs often integrate advanced interfaces such as EMIF (External Memory Interface) and McBSP (Multichannel Buffered Serial Port), facilitating seamless interaction with a variety of peripheral devices. This ensures that the DSP can suit different application needs and integrate well into various system architectures.

Texas Instruments emphasizes low power consumption with the C64x DSPs, making them ideal for portable or energy-sensitive applications. Advanced power management techniques and technologies, such as dynamic voltage and frequency scaling, are incorporated to further enhance energy efficiency without compromising performance.

In summary, the Texas Instruments TMS320C64x DSP family stands out due to its high-performance capabilities driven by a VLIW architecture, high clock speeds, extensive memory options, a rich instruction set, and advanced connectivity features, all while maintaining power efficiency. These characteristics make it an exceptional choice for developers looking to integrate robust digital signal processing into their applications, whether in telecommunications, audio and video processing, or embedded control systems.
Top Page Image Contents