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AIMB-250 Series 
20 AIMB-250 Series User’s Manual 
 
 
• 
Distributed arbitration for highly concurrent operation 
• 
Three USB host controllers provide high performance peripherals with 480 Mbps of 
bandwidth, while enabling support for up to six USB 2.0 ports. This results in a 
significant increase over previous integrated 1-4 port hubs at 12 Mbps 
• 
The latest AC ’97 implementation delivers 20-bit audio for enhanced sound quality 
and full surround sound capability. Integrated audio solutions continue to enjoy 
success as a very cost-effective, yet high-performance solution 
• 
LAN Connect Interface (LCI) provides flexible network solutions such as 10/100 
Mbps Ethernet and 10/100 Mbps Ethernet with LAN manageability 
• 
Dual Ultra ATA/100 controllers, coupled with the Intel® Application Accelerator – a 
performance software package – support faster IDE transfers to storage devices 
• 
Intel Application Accelerator software provides additional performance over native 
ATA drivers by improving I/O transfer rates and enabling faster O/S load time, 
resulting in accelerated boot times 
• 
Communication and Network Riser (CNR) offers flexibility in system configuration 
with a baseline feature set that can be upgraded with an audio card, modem card, or 
network card 
1.6.4 
DRAM Interface (Intel 855GME) 
The 855GME GMCH system memory controller directly supports the following: 
•  One channel of PC1600/2100/2700 DDR SDRAM memory 
•  DDR SDRAM devices with densities of 128-Mb, 256-Mb, and 512-Mb technology 
•  Up to 1 GB (512-Mb technology) SDRAM 
1.6.5 
DRAM Interface (Intel 855GME) 
The 855GME GMCH system memory controller directly supports the following: 
•  One channel of PC1600/2100 DDR SDRAM memory 
•  DDR SDRAM devices with densities of 128-Mb, 256-Mb, and 512-Mb technology 
•  Variable page sizes of 2-kB, 4-kB, 8-kB, and 16-kB. Page size is individually selected 
for every row and a maximum of 16 pages may be opened simultaneously 
1.6.6 PCI 
Interface 
The ICH4 PCI interface provides a 33 MHz, Rev. 2.2 compliant implementation. All PCI 
signals are 5V tolerant, except PME#. The ICH2 integrates a PCI arbiter that supports up to 
six external PCI bus masters in addition to the internal ICH4 requests.