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What is Fully Buffered DIMM?

A.FB-DIMM is a new memory interconnect technology standard for high-end memory connections. FB-DIMM transitions the memory channel to a serial interface and replaces the DIMM register with a memory buffer. FB-DIMM connections are expected to enable systems to scale the number of memory channels available to a server system. Implementations of FB-DIMM enabled DDR2 memory are expected in future Intel architecture-based platforms.

Current DIMMs will be unable to handle the memory requirements of the type of high-speed servers that will use DDR2 at speeds of 667 to 800 Mbits/s. PCs, which don't have the very large memory size of most servers, can use the standard DDR2 without the buffer. A conventional buffered DIMM includes added logic that reduces the loading on the system address and control bus lines. A system designed for buffered DIMMs can use more modules, since the buffer chips absorb some of the load.

A new Memory Implementers Forum (www.memforum.org) has been formed to focus on developing memory technologies including DDR2 and Fully Buffered-DIMM (FB-DIMM). Click here to see a nice animated presentation.

Q. Why does the FS2340 require four logic analyzer cards when it only requires four termination adapters?

A. The FS2340 requires up to four logic analyzer cards depending on whether protocol analysis (double probed) or timing analysis is being used, and the type of logic analyzer card being used. The customer will need 4 cards/8 pod pairs/16 pods and 4 FS1014 or FS1026 termination adapters.

Q. Can you guarantee the FS2340 will operate correctly in my system?

A. Another good question. Factors beyond the control of FuturePlus Systems that can have a significant effect on the performance of the whole system include the type of memory controller and AMB, the target layout, the type of DIMM used, which DIMM socket is being probed, and which logic analyzer cards are being used. So, we cannot guarantee your success. We have made every effort to give you a product that has every chance of succeeding.

Q. Can the FS2340 perform Eye Scan measurements?

A. Eyescan will not be a useful tool on the FS2340 because the logic analyzer connection is downstream from the AMB chip on the analysis probe.

Q. What software is included with the FS2340 FBD Analysis Probe?

A. Files are included that automatically set up the Agilent logic analyzer for state or timing analysis mode and label all the signal names. An optional protocol decoder (FS1124) is available to translate the data into memory protocol during state analysis.

Q. Does your probe get its power from my system?

A. Yes. It will appear to your system as a standard DIMM.

Q. The FS2340 is designed to be used as a 'raw card version B" DIMM. Are you planning to support the other raw card versions?

A. We will support them as we get requests from customers. Contact our sales department for more details.

Q. Is sub-contract manufacturing services available for the FS2340?

A. Some customers wish to do this themselves, and some wish to contract it out. We are investigating helping customers locate a qualified source for this. Contact FuturePlus Systems for up-to-date information.

Q. How do I find out what are the latest versions of Agilent logic analyzer operating software?

A. Contact your nearest Agilent Call Center.

Q. How do I know which Agilent logic analyzer is best for my needs?

A. Click here.

Have a question you don't see answered? Contact Technical Support for a prompt answer.