Displaying Video in BT.656 or Y/C Mode

4.10 Displaying Video in BT.656 or Y/C Mode

In order to display video in the BT.656 or Y/C format, the following steps are needed:

1)Set the frame size in VDFRMSZ. Set the number of lines per frame (FRMHIGHT) and the number of pixels per line (FRMWIDTH).

2)Set the horizontal blanking in VDHBLNK. Specify the frame pixel counter value where horizontal blanking starts (HBLNKSTART) and pixel location where horizontal blanking stops (HBLNKSTOP).

3)Set the V bit timing for field 1 in VDVBIT1. Specify the line where the V bit is set (VBITSET1) and the line where the V bit is cleared (VBITCLR1).

4)If external VBLNK signal is needed, set the VBLNK start for field 1 in VDVBLKS1. Specify the frame line (VBLNKYSTART1) and frame pixel counter (VBLNKXSTART1) values for the pixel where VBLNK goes active for field 1. Set the VBLNK end for field 1 in VDVBLKE1. Specify the frame line (VBLNKYSTOP1) and frame pixel counter (VBLNKXSTOP1) values for the pixel where VBLNK goes inactive for field 1.

5)Set the V bit timing for field 2 in VDVBIT2. Specify the line where the V bit is set (VBITSET2) and the line where the V bit is cleared (VBITCLR2).

6)If external VBLNK signal is needed, set the VBLNK start for field 2 in VDVBLKS2. Specify the frame line (VBLNKYSTART2) and frame pixel counter (VBLNKXSTART2) values for the pixel where VBLNK goes active for field 2. Set the VBLNK end for field 2 in VDVBLKE2. Specify the frame line (VBLNKYSTOP2) and frame pixel counter (VBLNKXSTOP2) values for the pixel where VBLNK goes inactive for field 2.

7)Set VDIMGSZn. Adjust the displayed image size by setting the HSIZE and VSIZE bits.

8)Set VDIMOFF. Adjust the displayed image offset within the active video area (by setting HOFFSET and VOFFSET).

9)Set the F bit timing in VDFBIT. Specify the line where the F bit is cleared (FBITCLR) and the line where the F bit is set (FBITSET).

10)If external FLD output is required, set the video display field 1 timing. Specify the line and pixel where FLD goes inactive (VDFLDT1). Set the video display field 2 timing. Specify the line and pixel where FLD goes active (VDFLDT2).

11)Set VDCLIP. Default values for video clipping are 16 for the lower clipping, 235 for the higher clipping of the Y values, and 240 for the higher clipping of the Cb and Cr values.

SPRU629

Video Display Port

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Texas Instruments TMS320C64x DSP manual Displaying Video in BT.656 or Y/C Mode
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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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