R
Spartan-3A DSP 3400A Edition Board Hardware
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.
Table 1-18:
Signal
LCD_DB_4
LCD_DB_5
LCD_DB_6
LCD_DB_7
LCD_E
LCD_RS
LCD_RW
FPGA LCD Interface
FPGA Pin
G21
R19
D25
D24
J20
H20
J19
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 1-19:
User-defined Button FPGA Pin Assignments
Button No.
S4
S5
S6
S7
S8
Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
FPGA Pin
N25
N26
Y26
N23
P21
Description
GPIO_SW_NORTH
GPIO_SW_WEST
GPIO_SW_CENTER
GPIO_SW_EAST
GPIO_SW_SOUTH
33
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