Y/C Video Capture Mode

3.3 Y/C Video Capture Mode

The Y/C capture mode is similar to the BT.656 capture mode but captures 8 or 10-bit 4:2:2 data on separate luma and chroma data streams. One data stream contains Y samples and the other stream contains multiplexed Cb and Cr samples co-sited with every other Y sample. The Y samples are written into a Y FIFO and the chroma samples are demultiplexed and written into separate Cb and Cr FIFOs for transfer into Y, Cb, and Cr buffers in DSP memory. The packing and order of the samples is determined by the sample size (8-bit or 10-bit) and the device endian mode.

The Y/C capture mode supports HDTV standards such as SMPTE260, SMPTE296, and BT.1120 with embedded EAV and SAV codes. It also supports SDTV YCbCr modes that use separate control signals (sometimes called CCIR601 mode)

As with the BT.656 capture mode, data bytes where the 8 most-significant bits are all set to 1 (FF.0h, FF.4h, FF.8h, FF.Ch) or are all cleared to 0 (00.0h, 00.4h, 00.8h, 00.Ch) are reserved for data identification purposes and consequential- ly only 254 of the possible 256 8-bit words (or 1016 of 1024 10-bit words) may be used to express signal value.

3.3.1Y/C Capture Channels

Because Y/C mode requires the entire VDATA bus, only single channel opera- tion is supported. If the DCHNL bit in VPCTL is set, then Y/C mode cannot be selected. Y/C capture takes place on channel A only. Both embedded timing references and external control inputs are supported.

3.3.2Y/C Timing Reference Codes

Many high-resolution Y/C interface standards provide for embedded timing reference codes. These codes are identical to those used in the BT.656 stan- dard except that they appear on both the luma (Y) and chroma (CbCr) data streams in parallel.

3-12

Video Capture Port

SPRU629

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Texas Instruments TMS320C64x DSP manual Y/C Video Capture Mode, 1 Y/C Capture Channels, 2 Y/C Timing Reference Codes
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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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