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Display Subsystem Basic Programming Model
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•
two separated luma/chroma output signals with both video DAC1(luma analog signal) and DAC2
(chroma analog signal)
Selection is performed with DSS.
[6] VENC_OUT_SEL bit:
•
When VENC_OUT_SEL bit is set to 0 (reset value), video DAC1 is selected for composite video
(CVBS) signal
•
When VENC_OUT_SEL bit is set to 1, video DAC1 is selected for luma signal
One of the first VENC settings is to enable the outputs of the video DACs. This setting depends on the
video output format:
•
CVBS video output format: Enable video DAC1 composite output by setting the
DSS.
[1] COMPOSITE_ENABLE bit to 1
•
Separated luma/chroma output format: Enable video DAC1 luma output by setting the
DSS.
[0] LUMA_ENABLE bit to 1 and enable video DAC2 chroma
output by setting the DSS.
[2] CHROMA_ENABLE bit to 1
shows different configurations for the analog TV output, along with the respective values to
be set in the dedicated registers inside the device system control module.
Table 7-71. Analog TV Output Modes
Analog TV output modes
Control Register
Composite
Composite
S-Video DC-coupled
Bypass mode, dual channels
DC-coupled mode,
AC-coupled mode,
mode, high full scale
high full scale
low full scale
CONTROL.CONTROL_ 0: Buffer Mode
0: Buffer mode
0: Buffer mode
1: Bypass mode
DEVCONF1[18]
TVOUTBYPASS
CONTROL.CONTROL_ 0: DC-coupling
1: AC-coupling
0: DC-coupling
0: DC-coupling
DEVCONF1[11]
TVACEN
AVDAC1
CONTROL.CONTROL_ 0: Don't care
0: Don't care
0: Don't care
0: Don't care
AVDAC1 [20]
AVDAC1_COMP_EN
CONTROL.CONTROL_ 0: Single channel
0: Single channel
1: Dual channel
1: Dual channel
AVDAC1 [19]
AVDAC1_COMP_EN
CONTROL.CONTROL_ 0: Composite
0: Composite
0: Luma
0: Luma
AVDAC1 [18]
AVDAC1_COMP_EN
CONTROL.CONTROL_ 0: Full scale (1.3V)
1: Full scale (0.88V)
0: Full scale (1.3V)
0: Full scale (1.3V)
AVDAC1 [17]
AVDAC1_COMP_EN
CONTROL.CONTROL_ 0: External current
0: External current
0: External current
0: External current reference
AVDAC1 [16]
reference
reference
reference
AVDAC1_COMP_EN
AVDAC2
CONTROL.CONTROL_ 0: Don't care
0: Don't care
0: Don't care
0: Don't care
AVDAC2 [20]
AVDAC2_COMP_EN
CONTROL.CONTROL_ 0: Single channel
0: Single channel
1: Dual channel
1: Dual channel
AVDAC2 [19]
AVDAC2_COMP_EN
CONTROL.CONTROL_ 1: Chroma
1: Chroma
1: Chroma
1: Chroma
AVDAC2 [18]
AVDAC2_COMP_EN
CONTROL.CONTROL_ 0: Full scale (1.3V)
0: Full scale (1.3V)
0: Full scale (1.3V)
0: Full scale (1.3V)
AVDAC2 [17]
AVDAC2_COMP_EN
CONTROL.CONTROL_ 0: External current
0: External current
0: External current
0: External current reference
AVDAC2 [16]
reference
reference
reference
AVDAC2_COMP_EN
1774
Display Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated