User`s guide

4-16 Intel
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StrongARM
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SA-1110 Microprocessor Development Board User’s Guide
Hardware Considerations
4.6.1 LED Displays
There are six LEDs on the SA-1110 Development Board. These are primarily intended to provide
general status and power status and some low-level system debug and development support. Many
more system debug LEDs are on the SA-1111 Development Module.
4.6.2 LCD Displays
4.6.2.1 Sharp 3.9” Reflective Color
The SA-1110 Development Board provides direct support for a Sharp 3.9” 320x240 reflective TFT
color LCD (Sharp panel number LQ039Q2DS01). These panels utilize a new technology that does
not require backlighting and thus use much less battery power than the more common transmissive
LCD types. An optional frontlight may be switched on or off as required by the ambient lighting
conditions.
Note: The design does not include a backlight power supply.
The 3.9” reflective panel requires rather elaborate analog and digital support circuitry on the
SA-1110 Development Board. Sharp does sell a custom ASIC part number LZ9GG31 that
implements the required digital circuitry, however the SA-1110 Development Board uses a PZ3126
CPLD to implement the LZ9GG31 functions.
A limitation with the SA-1110 is that it can not switch between eight bits per pixel (bpp) palettized
color RGB444 and 16 bpp hi-color RGB565 with out re-mapping the LCD data pins at the board
level. Normally this is not a problem because the bpp required by a particular application is known
before a design is complete. To provide a more flexible development design, the SA-1110
Development Board replaces the LZ9GG31 ASIC with a PZ3128 CPLD that implements the Sharp
LCD digital functions and in addition allows selecting between 8 bpp palettized color with
RGB444 12bpp, and hi-color RGB565 16bpp color systems. These two modes require different pin
Table 4-8. LED Descriptions
LED Name Description
D13 GPIO 17_LED
GPIO 17 LED
Used to signal boot diagnostic status. General purpose boot progress indicator.
Uses flashing codes to indicate boot progress. After boot time GPIO 17 is used as
the L3 MODE signal.
D9
D9_LED
D9 LED
General purpose red LED controlled by BCR.
D8
D8_LED
D8 LED
General purpose green LED controlled by BCR.
D11
AGC_LED
Automatic Gain Control LED
Used to indicate analog clipping in the microphone input circuit in the UDA1341
stereo codec. Intended as a development aid in AGC level control software and
speech recognition development.
D10
OH_LED
Off Hook LED
Indicates POTS modem off hook signal. Connected to UCB1300 GPIO_8. Also used
by system diagnostics to indicate successful UCB1300 communication.
D4
CORE_PWR_LED
Core Power LED
Indicates SA-1110 Vcore voltage is active. Used as an aid in power management
code development. Vcore is controlled by the SA_PWR_EN signal from the SA-1110
device.