Spartan-3A DSP 3400A Edition User Guide
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33
UG498 (v2.2) November 17, 2008
Spartan-3A DSP 3400A Edition Board Hardware
R
26.
LCD
Hantronix HDM16216L-2-L30S, 16-character × 2-line resolution LCD to display text
information. The data interface to the LCD is connected to the FPGA and supports
only the 4-bit mode. Onboard level shifters are used to shift the voltage level between
the FPGA and the LCD. The LCD is equipped with a connector that allows the LCD to
be removed from the development board to gain access to the components below.
Turning the potentiometer located below the LCD with a screwdriver allows you to
adjust the image contrast of the LCD. The LCD is equipped with a backlight that can be
turned off by removing jumper JP10.
27.
User-defined Buttons
The functions of the five user-defined buttons are determined by the designer; all the
buttons are directly connected to the FPGA.
Table 1-18:
FPGA LCD Interface
Signal
FPGA Pin
LCD_DB_4
G21
LCD_DB_5
R19
LCD_DB_6
D25
LCD_DB_7
D24
LCD_E
J20
LCD_RS
H20
LCD_RW
J19
Table 1-19:
User-defined Button FPGA Pin Assignments
Button No.
FPGA Pin
Description
S4
N25
GPIO_SW_NORTH
S5
N26
GPIO_SW_WEST
S6
Y26
GPIO_SW_CENTER
S7
N23
GPIO_SW_EAST
S8
P21
GPIO_SW_SOUTH
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