LM1276 National Semiconductor Corporation, LM1276 Datasheet - Page 37

• Manufacturer Part Number: LM1276
• Description: 150 Mhz I2c Compatible Rgb Preamplifier With Internal 512 Character Osd Rom, 512 Character Ram And 4 Dacs
• Manufacturer: National Semiconductor Corporation

Bits 31–0
Control Register Definitions
Fade In/Fade Out Interval Register:
Pre-Amplifier Interface Registers
Blue Channel Gain:
Green Channel Gain:
Red Channel Gain:
Contrast Control:
Bits 7–4
Bits 3–0
Bits 6–0
Bit 7
Bits 6–0
Bit 7
Bits 6–0
Bit 7
These are the Display Window 2 Column Width 2x Enable Bits. These thirty-two bits correspond to columns 31–0
of Display Window 2, respectively. A value of zero indicates the column will have normal width (12 OSD pixels). A
value of one indicates the column will be twice as wide as normal (24 OSD pixels). For the double wide case, each
Character Font pixel location will be displayed twice, in two consecutive horizontal pixel locations. The user should
note that if more than 32 display characters are programmed to reside on a line, then all display characters after
the first thirty-two will have normal width (12 pixels).
COLWIDTH2B1 (0x841D)
These three bits determine the interval for fading in or fading out the OSD window in the vertical
direction.
These three bits determine the interval for fading in or fading out the OSD window in the horizontal
direction.
This register determines the gain of the blue video channel. This affects only the blue channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
This register determines the gain of the green video channel. This affects only the green channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
This register determines the gain of the red video channel. This affects only the red channel
whereas the contrast register (0x8433) affects all channels.
Reserved and should be set to zero.
Res’d
Res’d
Res’d
Res’d
RSV
RSV
RSV
RSV
Vertical Interval
V_INTVL[3:0]
Window 2 Column Width - Low Bytes
(Continued)
CONTRCTRL (0x8433)
FADE_INTVL (0x8429)
GGAINCTRL (0x8431)
BGAINCTRL (0x8430)
RGAINCTRL (0x8432)
COL2[15:0]
CONTRAST[6:0]
Green Gain
GGAIN[6:0]
BGAIN[6:0]
RGAIN[6:0]
37
Blue Gain
Red Gain
Contrast
Horizontal Interval
H_INTVL[3:0]
COLWIDTH2B0 (0x841C)
www.national.com