lm4312 National Semiconductor Corporation, lm4312 Datasheet - Page 7

• Manufacturer Part Number: lm4312
• Description: Mobile Pixel Link Two Mpl-2 , Rgb Display Differential Interface Serializer With Optional Dithering And Look Up Table
• Manufacturer: National Semiconductor Corporation

Functional Description
The LM4312 is a Mobile Pixel Link two Serializer that serial-
izes a 24-bit RGB plus three control signals (VS, HS, and DE)
to two MPL-2 DD lines plus the serial clock DC line. 18-bit
RGB, 24-bit RGB, or optionally 24-bit RGB data is dithered to
18 bits and then serialized and level translated to MPL-2 by
the SER. An optional Look Up Table consisting of three 256
X 8-bit RAMs may also be used and is controlled via a 3 or 4-
wire SPI interface. The LM4312 is compatible with the
LM4310 Deserializer and also Display Drivers with integrated
MPL-2 Deserializers.
2DD+DC MPL-2 Link Options
Input
24-bit RGB
24-bit RGB
18-bit RGB
Serial
2 DD + DC, Figure 10
2 DD + DC, Figure 11
2 DD + DC, Figure 11
FIGURE 6. General LM4312 Block Diagram
FIGURE 5. SPI Interface
Output
24-bit RGB
18-bit RGB
18-bit RGB
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Three link configurations are provided by the LM4312 SER.
24-bit RGB can be serialized onto the 2 DD + DC configura-
tion using a 8X DC clock. 24-bit RGB can be dithered to 18-
bit RGB and serialized onto the 2 DD + DC configuration using
a 6X DC clock. Or 18-bit RGB can be serialized onto the 2 DD
+ DC configuration using a 6X DC clock. See 2DD+DC MPL-2
Link Options. The device's default configuration is for 18 bits
input, Dither OFF, and 6X mode.
Notes
Dither OFF, DC = 8X PCLK
Dither ON, DC = 6X PCLK
Dither OFF, DC = 6X PCLK
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