Phytec phyCORE-PXA255, Hardware Manual

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LCD Interface
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PHYTEC Meßtechnik GmbH 2004 L-657e_0
47
9 LCD Interface
There is an active TFT-LCD interface on the Development Board for
controlling displays with 18-bit color depth (6 each for red, green and
blue). The LCD signals are decoupled from the PXA255 controller
with 74LVC254 line driver circuits. Since the controller only supports
16-bit color information, the least significant bits decoding blue and
red are connected to GND.
L D D 0 - 1 5
L C D - C o n t r o l
> H e l l o
P W M 0
I n v e r t e r
E n a b l e
F l a s h 3 2 - b i t
D 0 - D 1 5
V C C _ C O R E
U 1 0
D 0 - D 1 5
U 1 3
S D R A M
B a n k 0
D 1 6 - D 3 1
U 1 5
S D R A M
B a n k 0
F l a s h 3 2 - b i t
D 1 6 - D 3 1
U 1 2
U 5
P X A 2 5 5
X 1
M M C - C a r d
3 2 k H z
U 2 0
R T C
U 2
E G P I O
U 1 9
C A N
U 3
U S B
Figure 23: Active TFT LCD Connection
The Sharp display used on the Development Board offers the
possibility of adjusting the display size and position via two inputs.
The control PLD U6 enables configuration of these inputs over
internal registers.
The Development Board can be connected to the TFT display with the
help of a 33-pin ribbon cable on the connector plug X35. An
LCD-001 adapter board is necessary when using the Sharp TFT
display in order to convert the Hirose connector plug to a ribbon cable
connector plug. Furthermore, there is a 2.0 mm universal connector
plug on the board at X33, where other display types can be adapted to
the PXA255’s LCD port.