Altera Cyclone III Development Board User Manual download pdf (Page 58)

2–48 Chapter 2: Board Components

On-Board Memory

Cyclone III 3C120 Development Board Reference Manual © March 2009 Altera Corporation

The board provides both 12 V and 3.3 V to installed daughter cards up to 18.6 W each.

Ta bl e 2–49 shows the maximum current allowed per voltage.

Ta bl e 2–50 lists HSMC component reference and manufacturing information.

On-Board Memory

This section describes the on-board memory interface support, provides signal name,

type, and signal connectivity relative to the Cyclone III device.

The board has the following on-board memory:

■ DDR2 SDRAM

■ SRAM

DDR2 SDRAM

The board has 256 MB of dual-channel DDR2 SDRAM memory with a 72-bit data

width. These devices use the 1.8-V SSTL signaling standard.

The data bus can be configured as two separate buses of 32 bits each, or a single 32-bit

and a single 40-bit bus. One address/control bus is referred to as TOP and the other is

referred to as BOT (bottom), as they connect to the respective Cyclone III device

edges. The interface comprises four ×16 devices for the 64-bit datapath, and a single

×8 device for the ECC bits for a total of 5 devices (3 to TOP, 2 to BOT). The Micron part

numbers are MT47H32M16CC-3 for the ×16 devices and MT47H32M8BP-3 for the ×8

device.

N/A User LED intended to show RX data

activity on the HSMC interface

2.5 V HSMB_RX_LED F26

N/A User LED intended to show TX data

activity on the HSMC interface

2.5 V HSMB_TX_LED D28

Table 2–48. HSMC Port B Interface Signal Name, Description, and Type (Part 4 of 4)

Board

Reference Description I/O Standard

Schematic

Signal Name

Cyclone III

Device Pin

Number

Table 2–49. HSMC Power Supply

Voltage

Maximum Current

From Host Maximum Wattage

12 V 1.0 A 12.0 W

3.3 V 2.0 A 6.6 W

Table 2–50. HSMC Component Reference and Manufacturing Information

Board

Reference Description Manufacturer

Manufacturing

Part Number

Manufacturer

Website

J8 and J9 High-speed mezzanine card (HSMC), custom

version of QSH-DP family high speed socket

Samtec ASP-122953-01 www.samtec.com

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