![](http://datasheet.mmic.net.cn/390000/TVP3030-175_datasheet_16839167/TVP3030-175_61.png)
2–45
2.16 Register Definitions
2.16.1
General-Control Register (Index: 0x1D, Access: R/W, Default: 0x00)
The general-control register definition is listed in Table 2–23.
Table 2–23. General-Control Register
BIT
NAME
VALUES
DESCRIPTION
GCR7
0
Reserved
GCR6
0: Disable (default)
Overscan enable. Specifies whether to enable the user-defined overscan
Overscan enable. Specifies whether to enable the user defined overscan
screen border.
1: Enable
GCR5
0: Disable (default)
Sync enable. This bit specifies whether sync information is to be output onto
IOG.
1: Enable
GCR4
0: 0 IRE (default)
Pedestal control. This bit specifies whether a 0 or 7.5 IRE blanking pedestal
is to be generated on the video outputs.
1: 7.5 IRE
GCR3
0: Little-endian (default)
Little-endian/big-endian select. Selects either little- or big-endian format for the
Little endian/big endian select. Selects either little or big endian format for the
pixel-bus interface.
1: Big-endian
GCR2
0
Reserved
GCR1
0: Do not invert (default)
VSYNCOUT output polarity.
1: Invert
GCR0
0: Do not invert (default)
1: Invert (high)
HSYNCOUT output polarity.
2.16.2
Miscellaneous-Control Register (Index: 0x1E, Access: R/W, Default: 0x00)
The miscellaneous-control register definition is listed in Table 2–24.
Table 2–24. Miscellaneous-Control Register
BIT
NAME
VALUES
DESCRIPTION
MSC7
0
Reserved
MSC6
0
Reserved
MSC5
0: Palette RAM
(default)
Palette bypass bit. This bit selects between the color palette RAM and the
direct-color pipeline delay for the input to the DACs. When the palette RAM is
selected, the data can be from the VGA port or from the pixel port as pseudo-color,
true-color, or overlay data. MSC5 is logically ORed with the color key switching
function. The color-key switching function defaults to palette bypass. MSC5 can
then be used to select between palette RAM when logic 0, and palette bypass
when logic 1.
1: Palette Bypass
MSC4
0
Reserved
MSC3
0: 6-bit (default)
8- or 6-bit operation bit. This bit selects the DAC resolution and the number of bits
8 or 6 bit operation bit. This bit selects the DAC resolution and the number of bits
used for each color in each palette RAM.
1: 8-bit
MSC2
0
Reserved
MSC1
0
Reserved
MSC0
0: Disable (default)
1: Enable
DAC power down If set to logic 1 the DACs power down
DAC power down. If set to logic 1, the DACs power down.