Altera LCD Multimedia HSMC - Manual (Page 18)

Altera Corporation 2–10
August 2008 LCD Multimedia HSMC
Board Components and Interfaces
Display LCD Touch Panel Display
The board provides a 4.3" Toppoly TD043MTEA1 active matrix color
display, with 800x480 pixel resolution.
Table 2–7 lists LCD Touch Panel
Display board reference and manufacturing information.
The LCD panel supports the 24-bit parallel RGB data interface and
provides a 3-wire interface to control the display function registers. The
LCD Multimedia HSMC is also equipped with an Analog Devices
AD7843 touch screen digitizer chip. The AD7843 is a 12-bit analog to
digital converter (ADC) for digitizing x and y coordinates of touch points
applied to the touch screen.
Timing Protocol of the LCD TDM Controller
Figure 2–6 below describes the input timing waveform information of the
LCD TDM Controller implemented in the MAX II CPLD. The 8-bit wide
HC_LCD_DATA signal is presumed to contain a stream of color pixel
data, with each pixel represented by three successive clock-cycles of the
stream. The data is presented in the order "BGR". The LCD TDM
Controller uses the HC_HD pulse to determine the position of the BLUE
color sample, and thus the start of each three-clock pixel-period. State
transitions on HC_HD (0
.1 or 1.0) coincide with the presentation of
BLUE color on the HC_LCD_DATA input. The GREEN and RED values
for that same pixel are presented on the next two clock-cycles.
Figure 2–7
shows the timing information on the output side. The LCD TDM block
will generate an output NCLK clock and 24-bit RGB data to the LCD
panel. The NCLK signal runs at 1/3 the frequency of the incoming clock
HC_NCLK.
Table 2–7. LCD Touch Panel Display Manufacturing Information
Board Reference Device Description Manufacturer
Manufacturer Part
Number
Manufacturer
Website
Display + J10 4.3" Active Matrix
Color LCD Screen
(480x800 RGB) +
Touch Panel Toppoly TD043MTEA1 www.toppoly.com
U6 12-Bit ADC for
resistive
touchscreen sensing Analog Devices AD7843 www.analog.com