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Intel
®
IQ31244 Customer Reference Board
User’s Manual 21
3.7 DDR SDRAM
The Intel
®
80321 I/O Processor integrates a memory controller unit (MCU) to provide a direct
interface between the processor and its local memory subsystem.The IQ31244 board is equipped
with a 184-pin DIMM socket to accept a +2.5 V Double Data Rate (DDR) synchronous DRAM
module with or without error correction code (ECC). This DDR SDRAM interface provides a
direct connection to a reliable high-bandwidth memory subsystem. The socket accepts a 64- or
72-bit DDR SDRAM module with up to two 512 MByte banks for a maximum of 1 GByte. The
SDRAM is accessible by the processor and the PCI bus by means of address translation by the
memory management unit of the 80321.
3.7.1 Upgrading SDRAM
The IQ31244 board is equipped with unbuffered DDR SDRAM with ECC inserted in the 184-pin
DIMM socket. The memory can be expanded by inserting a maximum-sized memory module of
1 Gbyte into the DIMM socket. The supported memory combinations are shown in Table 11.
3.7.2 Installation and Removal of Memory Modules
Installation and removal of DIMMs on the IQ31244 are simple procedures and require no special
tools. Remove the adapter module from the motherboard before its memory configuration is
changed. Take care to avoid static discharge while contacting the module or the motherboard. Wear
a properly connected grounding strap while installing or removing memory modules on the
IQ31244.
Align the key cut-outs of the module to the key pins of the DIMM socket. The memory module
must be inserted vertically, and the latches on the socket must engage the mounting holes on the
DIMM module. Be sure that the latches on both sides of the module are properly engaged.
Table 11. Supported SDRAM Configurations
Type Size Class Total Memory Size
DDR 200
8M × 64
8M × 72
CL2 64 MBytes
CL2 ECC 64 MBytes
16M × 64
16M × 72
CL2 128 MBytes
CL2 ECC 128 MBytes
32M × 64 CL2 256 MBytes
32M × 72 CL2 ECC 256 MBytes
64M × 64 CL2 512 MBytes
64M × 72 CL2 ECC 512 MBytes
128M × 64 CL2 1 GByte
128M × 72 CL2 ECC 1 GByte