www.ti.com
4.3
Y/C Video Display Mode
4.3.1 Y/C Display Timing Reference Codes
VDOUT[9−2]
80.0
80.0
80.0
FF
.C
00.0
00.0
Y 0
Y 5
Y 1916
Y 1917
Y 1918
Y 1919
Y 1
Y 2
Y 3
Y 4
One Line
XY
.0
80.0
10.0
10.0
FF
.C
00.0
00.0
XY
.0
80.0
80.0
80.0
FF
.C
00.0
00.0
XY
.0
80.0
FPCOUNT
SAV
EAV
Blanking Data
EAV
Active Video
Blanking
VCLKOUT
Next Line
4
4
272
1920
VDOUT[19−12]
10.0
10.0
10.0
FF
.C
00.0
00.0
Cb 0
Cr 2
Cb 958
Cr 958
Cb 959
Cr 959
Cr 0
Cb 1
Cr 1
Cb 2
XY
.0
10.0
80.0
80.0
FF
.C
00.0
00.0
XY
.0
10.0
10.0
10.0
FF
.C
00.0
00.0
XY
.0
10.0
SAV
EAV
Blanking Data
EAV
0
5
1916
1917
1918
1920
1
2
3
4
1921
1922
1923
1924
1925
1926
1927
1919
1920
1921
1922
1923
1924
1925
1926
2195
2196
2197
2198
2199
2194
1927
4.3.2 Y/C Blanking Codes
4.3.3 Y/C Image Display
Y/C Video Display Mode
The Y/C display mode is similar to the BT.656 display mode but outputs 8-bit 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 luminance sample. The Y samples are read from the Y FIFO
and the Cb and Cr samples are read from the Cb and Cr FIFOs and combined on the chroma output.
The Y/C display mode can generate HDTV standard output such as BT.1120, SMPTE260, or SMPTE296
with embedded EAV and SAV codes. It can also output separate control signals.
Because 16 bits are used for data output, the Y/C output mode requires both halves of the video port data
bus. If the DCHDIS bit in VPCTL is set, then Y/C mode cannot be selected.
The EAV and SAV embedded timing codes are identical to those output in BT.656 mode and timing is
controlled in the same manner. In Y/C mode, however, the codes must be output on both the Y and C
data streams (VDOUT[9-2] and VDOUT[19-12]). An example of BT.1120 line timing is shown in
Figure 4-13. Y/C Horizontal Blanking Timing (BT.1120 60I)
The time between the EAV and SAV code on each line represents the horizontal blanking interval. During
this time, the video port outputs the digital video blanking values. These values are 10h for luma (Y)
samples and 80h 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
EDMA events in the same manner.
Video Display Port
102
SPRUEM1 – May 2007