BT.656 and Y/C Mode Field and Frame Operation

Table 3–7. Vertical Synchronization Programming

 

VCxCTL Bit

 

VMode

EXC

VRST

Vertical Counter Reset Point

 

 

 

 

0

0

0

First EAV with V=1 after EAV with V=0 – beginning of vertical blanking period.

 

 

 

VCOUNT increments on each EAV.

1

0

1

First EAV with V=0 after EAV with V=1 – first active line. VCOUNT

 

 

 

increments on each EAV.

2

1

0

On HCOUNT reset after VCTL2 input active edge – beginning of vertical

 

 

 

blanking or vertical sync period. (VCTL2 must be configured as vertical

 

 

 

control signal). VCOUNT increments when HCOUNT is reset.

3

1

1

On HCOUNT reset after VCTL2 input inactive edge – end of vertical sync or

 

 

 

first active scan line. (VCTL2 must be configured as vertical control signal).

 

 

 

VCOUNT increments when HCOUNT is reset.

 

 

 

 

VMode 0 is used for BT.656 or Y/C capture (with embedded control) and corre- sponds to most digital video standards that number lines beginning with the start of vertical blanking. VMode 1 can also be used for BT.656 or Y/C capture but counts from the first active video line. This makes field detection more straightforward in some instances (see section 3.4.4) and allows the VCYSTARTn bit to be set to 1, but also has the effect of associating vertical blanking periods with the end of the previous field rather than the beginning of the current field. (This could be an issue when capturing VBI data.) VCOUNT operation for VMode 0 and VMode 1 is shown in Figure 3–8.

VMode 2 and VMode 3 are used for BT.656 or Y/C capture without embedded EAV/SAV codes and allow alignment with either the active or inactive edge of the vertical control signal on VCTL2. This can be a VBLNK or VSYNC signal from the video decoder.

3-20

Video Capture Port

SPRU629

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Texas Instruments TMS320C64x DSP Vertical Synchronization Programming, VC xCTL Bit VMode, Vertical Counter Reset Point
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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.
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