LCD Display Controller

Table 3-3. Active Display Pins Required

PXA250 Pin

LCD Panel Pin

PIn Type1

Definition

 

 

 

 

L_DD<15:0>

R<4:0>,G<5:0>,

Output

Data lines used to transmit the 16 bit data values to the LCD display.

B<4:0>

 

 

 

 

 

 

 

L_PCLK

Clock

Output

Pixel Clock - used by the LCD display to clock the pixel data into the

line shift register. In active mode this clock transitions constantly.

 

 

 

 

 

 

 

 

 

 

Line Clock - used by the LCD display to signal the end of a line of pixels

L_LCLK

Horizontal Sync

Output

that transfers the line data from the shift register to the screen and

 

 

 

increment the line pointers. Also signals the panel to start a new line.

 

 

 

 

L_FCLK

Vertical Sync

Output

Frame Clock - used by the LCD displays to signal the start of a new

frame of pixels that resets the line pointers to the top of the screen.

 

 

 

 

 

 

 

L_BIAS

DE (Data

Output

AC biases used in active mode as a data enable signal when data

Enable)

should be latched by the pixel clock from the data lines.

 

 

 

 

 

 

 

Vcon2

 

Contrast Voltage - Adjustable voltage input to LCD panel - external

N/A

N/A

voltage circuitry is required (no pin available on the PXA250

 

 

 

applications processor).

 

 

 

 

NOTES:

1.In reference to the PXA250 applications processor. Therefore, outputs are pins that drive a signal from the PXA250 applications processor to another device.

2.Vcon is a signal external to the PXA250 applications processor. Please refer to Section 3.5.1, “Contrast Voltage” on page .8

3.3.1Typical connections for Active Panel Displays

Figure 3-6, “Active Color Display Typical Connection” on page 7 shows a typical connection for an active panel display and should serve as a guide for designing systems which contain active LCD displays. The MSB of each color is indicated. The panel is 18-bit, with the LSB of red and blue tied to ground.

3-6

PXA250 and PXA210 Applications Processor Design Guide

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Intel PXA250 and PXA210 manual Typical connections for Active Panel Displays, Active Display Pins Required
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PXA250 and PXA210 specifications

The Intel PXA250 and PXA210 processors, part of the Intel XScale architecture, were introduced in the early 2000s, targeting mobile and embedded applications. They are known for their low power consumption, high performance, and advanced multimedia capabilities, making them suitable for a wide range of devices, including PDAs, smartphones, and other portable computing devices.

The PXA250, which operates at clock speeds ranging from 400 MHz to 624 MHz, features a superscalar architecture that allows it to issue multiple instructions per clock cycle. This enhances the overall performance for demanding applications while maintaining low power usage. It supports a variety of peripheral interfaces, including USB, Ethernet, and various memory types, which contributes to its versatility in different product designs.

One of the key technologies in the PXA250 is the integrated Intel Smart Repeat Technology, which optimizes data processing, thereby reducing the amount of power consumed during operation. This feature is particularly important for battery-powered devices, as it extends the overall battery life, allowing for longer usage times in mobile environments. Additionally, the PXA250 includes a dedicated graphics acceleration unit, which enables enhanced graphics and multimedia performance suited to modern applications at the time.

In contrast, the PXA210 is a more entry-level processor, aimed at cost-sensitive applications. Operating at lower clock speeds, typically around 200 MHz to 400 MHz, it forgoes some of the advanced performance features of the PXA250 while still offering a good balance of performance and power efficiency. The PXA210 is less complex, making it suitable for simpler devices that do not require the extensive capabilities of the PXA250.

Both processors utilize the Intel XScale architecture, which is based on the ARM instruction set. They are built on a 0.13-micron process technology, enabling higher density and lower power consumption compared to their predecessors. With integrated memory controllers and bus interfaces, they facilitate efficient data handling and connectivity options.

In summary, both the Intel PXA250 and PXA210 processors played a crucial role in the evolution of mobile computing by providing powerful processing capabilities with energy efficiency. Their features and technologies enabled device manufacturers to create innovative products that catered to the growing demand for portable devices during that era.
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