Altera Cyclone III LS FPGA Development Board Bedienungsanleitung PDF herunterladen (Seite 33)

Chapter 2: Board Components 2–25

General User Input/Output

User-Defined LEDs

The development board includes four general purpose LEDs. This section describes

all user-defined LEDs. For information on board-specific or status LEDs, refer to

“Status Elements” on page 2–16.

Board references D25 through D28 are four user-defined LEDs which allow status and

debugging signals to be driven to the LEDs from the FPGA designs loaded into the

Cyclone III LS device. The LEDs illuminate when a logic 0 is driven, and turns off

when a logic 1 is driven. There is no board-specific function for these LEDs.

Table 2–27 lists the user-defined LED schematic signal names and their corresponding

Cyclone III LS pin numbers.

Table 2–28 lists the user-defined LED component reference and the manufacturing

information.

LCD

The development board contains a single 14-pin 0.1" pitch dual-row header that

interfaces to a 16 character

× 2 line Lumex LCD display. The LCD has a 14-pin

receptacle that mounts directly to the board's 14-pin header, so it can be easily

removed for access to components under the display. You can also use the header for

debugging or other purposes.

The LCD signals are multiplexed with HSMC port B data signals HSMB_D65 through

HSMB_D75. The LCD/HSMC port B data select header switch (J18) is used to control

data multiplexing on the LCD signals and the HSMB_D[65:75] signals to the

Cyclone III LS device. If the shunt is not placed on the jumper, the FPGA can control

the LCD_HSMB_SEL signal. When the LCD_HSMB_SEL signal is set to '1' (shunt

removed), the FPGA controls the HSMB_D[65:75] signals. When the

LCD_HSMB_SEL is set to '0' (shunt installed), the FPGA controls the LCD signals. The

default value is set to '1'.

Table 2–29 summarizes the LCD pin assignments. The signal names and directions are

relative to the Cyclone III LS FPGA.

Table 2–27. User-Defined LED Schematic Signal Names and Functions

Board Reference Description

Schematic

Signal Name I/O Standard

Cyclone III LS Device

Pin Number

D28

User-defined LEDs.

Driving a logic 0 on the I/O port turns

the LED ON. Driving a logic 1 on the

I/O port turns the LED OFF.

USR_LED0

1.8-V

E24

D27 USR_LED1 G18

D26 USR_LED2 C21

D25 USR_LED3 C7

Table 2–28. User-Defined LED Component Reference and Manufacturing Information

Board Reference Device Description Manufacturer Manufacturer Part Number Manufacturer Website

D25 to D28 Green LEDs Lumex, Inc. SML-LX1206GC-TR www.lumex.com

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 57 58

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