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

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.

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