Altera Cyclone III Development Board User Manual download pdf (Page 39)

Chapter 2: Board Components 2–29

General User Interfaces

DDR2 User-Defined LEDs

Each channel of DDR2 memory has an LED near the respective DDR2 device. There is

no board-specific function for these LEDs; however, they are labeled

DDR2TOP_ACTIVE and DDR2BOT_ACTIVE on the silkscreen and are intended to be

illuminated when each respective memory channel is being accessed. The LEDs are

driven by the Cyclone III device.

Ta bl e 2–31 lists the DDR2 user-defined LED board reference number, schematic signal

name, and corresponding Cyclone III device pin number.

Ta bl e 2–32 lists the memory user-defined LED component reference and

manufacturing information.

Table 2–30. HSMC User-Defined LED Component Reference and Manufacturing Information

Board Reference Description Manufacturer

Manufacturing

Part Number

Manufacturer

Website

D12-D15 Green LED, 1206,

SMT, clear lens, 2.1 V

Lumex, Inc. SML-LX1206GC-TR www.lumex.com

Table 2–31. DDR2 User—Defined LEDs

Board Reference

Schematic

Signal Name

Cyclone III Device

Pin Number

D11 DDR2TOP_ACTIVE User defined but labeled DDR2TOP_ACTIVE on

the silkscreen for DDR2TOP memory channel.

D16 DDR2BOT_ACTIVE User defined but labeled DDR2BOT_ACTIVE in

silkscreen for DDR2BOT memory channel.

Table 2–32. Memory User-Defined LED Component Reference and Manufacturing Information

Board Reference Description Manufacturer

Manufacturing

Part Number

Manufacturer

Website

D11 and D16 Green LED, 1206,

SMT, clear lens 2.1 V

Lumex, Inc. SML-LX1206GC-TR www.lumex.com

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Altera Cyclone III Development Board User Manual Page 39