Xilinx XtremeDSP Spartan-3A DSP 3400A HW-SD3400A-DSP-DB-UNI-G User Manual page 33

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Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
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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: 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
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. FPGA Pin
S4
S5
S6
S7
S8
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Spartan-3A DSP 3400A Edition Board Hardware
N25 GPIO_SW_NORTH
N26 GPIO_SW_WEST
Y26 GPIO_SW_CENTER
N23 GPIO_SW_EAST
P21 GPIO_SW_SOUTH
Description
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