Datasheet

AD9880
Rev. 0 | Page 39 of 64
0x0D 7-0 Blue Channel Offset
These eight bits are the blue channel offset control.
The offset control shifts the analog input, resulting in
a change in brightness. Note that the function of the
offset register depends on whether clamp feedback is
enabled (Register 0x1C, Bit 7 = 1).
If clamp feedback is disabled, the offset register bits
control the absolute offset added to the channel. The
offset control provides a +127/−128 LSBs of adjust-
ment range, with 1 LSB of offset corresponding to
1 LSB of output code. If clamp feedback is enabled
these bits provide the relative offset (brightness) from
the offset adjust in the previous register. The power-up
default is 0x80.
SYNC
0x0E 7-0 Sync Separator
Selects the max Hsync pulse width for composite sync
separation. Power-down default is 0x20.
0x0F 7-2 SOG Comparator Threshold Enter
The enter level for the SOG slicer. Must be < than exit
level (Register 0x10). The power-up default is 0x10.
0x10 7-2 SOG Comparator Threshold Exit
The exit level for the SOG slicer. Must be > enter level
(Register 0x0F). The power-up default is 0x10.
0x11 7 Hsync Source
0 = Hsync, 1 = SOG. The power-up default is 0. These
selections are ignored if Register 0x11, Bit 6 = 0.
0x11 6 Hsync Source Override
0 = auto Hsync source, 1 = manual Hsync source.
Manual Hsync source is defined in Register 0x11,
Bit 7. The power-up default is 0.
0x11 5 Vsync Source
0 = Vsync, 1 = Vsync from SOG. The power-up
default is 0. These selections are ignored if Register
0x11, Bit 4 = 0.
0x11 4 Vsync Source Override
0 = auto Vsync source, 1 = MANUAL Vsync source.
Manual Vsync source is defined in Register 0x11,
Bit 5. The power-up default is 0.
0x11 3 Channel Select
0 = Channel 0, 1 = Channel 1. The power-up default is
0. These selections are ignored if Register 0x11,
Bit 2 = 0.
0x11 2 Channel Select Override
0 = auto channel select, 1 = manual channel select.
Manual channel select is defined in Register 0x11,
Bit 3. The power-up default is 0.
0x11 1 Interface Select
0 = analog interface, 1 = digital interface. The power-
up default is 0. These selections are ignored if
Register 0x11, Bit 0 = 0.
0x11 0 Interface Select Override
0 = auto interface select, 1 = manual interface select.
Manual interface select is defined in Register 0x11,
Bit 1. The power-up default is 0.
0x12 7 Input Hsync Polarity
0 = active low, 1 = active high. The power-up default is
1. These selections are ignored if Register 10x2,
Bit 6 = 0.
0x12 6 Hsync Polarity Override
0 = auto Hsync polarity, 1 = manual Hsync polarity.
Manual Hsync polarity is defined in Register 0x11,
Bit 7. The power-up default is 0.
0x12 5 Input Vsync Polarity
0 = active low, 1 = active high. The power-up default is
1. These selections are ignored if Register 0x11,
Bit 4 = 0.
0x12 4 Vsync Polarity Override
0 = auto Vsync polarity, 1 = manual Vsync polarity.
Manual Vsync polarity is defined in Register 0x11,
Bit 5. The power-up default is 0.
COAST AND CLAMP CONTROLS
0x12 3 Input Coast Polarity
0 = active low, 1 = active high. The power-up default
is 1.
0x12 2 Coast Polarity Override
0 = auto Coast polarity, 1 = manual Coast polarity.
The power-up default is 0.
0x12 1 Coast Source
0 = internal Coast, 1 = external Coast. The power-up
default is 0.
0x12 0 Filter Coast Vsync
0 = use raw Vsync for Coast generation, 1 = use
filtered Vsync for Coast generation The power-up
default is 1.