Texas Instruments TMS320C64x DSP Benutzerhandbuch

4-17

The time between the EAV and SAV code on each line represents the horizon-
tal blanking interval. During this time, the video port outputs the digital video
blanking values. These values are 10.0h for luma (Y) samples and 80.0h for
chroma (Cb/Cr) samples. These values are also output during the active line
period of vertical blanking (between SAV and EAV when V = 1), unless
replaced by VBI data. In addition, if the DVEN bit in VDCTL is 0, the blanking
values are output during the portion of active video lines that are not a part of
the displayed image.

Many of the standards supported by the Y/C display mode provide for both
interlaced and progressive scan formats. For interlaced display, the display
controls are programmed identically to BT.656 mode. For progressive scan
formats, the frame size is programmed to the size of a single field and only
field 1 is used.

The Y/C display mode uses the same FIFO organization as the BT.656 display
mode and generates DMA events in the same manner.

Display data is always packed into the FIFOs in 64-bit words and must be
unpacked before being sent to the display data pipeline. The unpacking and
byte ordering is dependant upon the display data size and the device endian
mode. For little-endian operation (default), data is unpacked from right to left;
for big-endian operation, data is unpacked from left to right.