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LCD AND USB CONFIGURATION
Sample applications
Sample displays
ConnectCore 9C/Wi-9C uses an internal programmable palette-LUT and a grayscaler
to support different color-processing techniques; three sample displays are
provided here:
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18-pin TFT display (for example, the SHARP LQ10D421). Accepts 18 color RGB
bits (6 bits per color) at a time. Only 16 bits are transferred from SDRAM: five
bits each for the three colors — R (red), G (green), and B (blue) — and a single
LSB (least significant bit) that is split into three equal values between R, G,
and B. This produces close to 2 16 , or 64 thousand colors.
8-pin STN color display (for example, the SHARP LM057QC1T01). Shifts eight
color bits at a time: RGBRGBRG bits followed by BRGBRGBR bits followed by
GBRGBRGB, and so on. This produces color enhancing in 3375 color grades.
4-pin STN monochrome display (for example, the Grand Pacific
Optoelectronics GM0008-13). Shifts four monochrome bits at a time, resulting
in 15 gray shades (2 4 – 1).
Resolution
The LCD resolution is programmable. These standard displays, with the following
resolutions, are supported:
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QVGA = 320 x 240
VGA = 640 x 480
Lower resolution displays also are supported. Displays typically have programmable
vertical resolutions within a certain range, especially if they are used for TV
displays (to accommodate different television standards).
Refresh frequency
The LCD refresh frequency is programmable. Lower refresh frequency drains less
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power, but might flicker. TFT displays usually flicker less than STN displays, as they
have a transistor switch behind each pixel on the screen and can hold the capacitive
charge longer.
Sample applications
The LCD interface uses memory as a video buffer. The display resolution is
determined by the product of three parameters: number of data bits x display
resolution x refresh frequency . This product cannot exceed the system bus
bandwidth allocated to the display.
Be aware that the actual bandwidth used by the display is:
display clock rate x number of bits per clock
For example, a clock rate of 50MHz with 16 bits of color yields a bandwidth of 100
MBps. To minimize bandwidth requirements, you might need to use an external
oscillator to get the exact rate.
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