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Intel® 6400/6402 Advanced Memory Buffer Datasheet

This document is a core specification for a Fully Buffered DIMM (FB DIMM, also FBD) memory system. This document, along with the other core specifications, must be treated as a whole. Information critical to an Intel® 6400/6402 Advanced Memory Buffer (AMB) design appears in the other specifications, with specific cross-references provided.
Intel® 6400/6402 Advanced Memory Buffer Overview
The Intel 6400/6402 Advanced Memory Buffer (AMB) complies with the FB-DIMM Architecture and Protocol Specification. This device supports DDR2 SDRAM memory components. The AMB allows buffering of memory traffic to support large memory capacities.
Fully Buffered DIMM (FBD) provides a high memory bandwidth, large capacity channel solution that has a narrow host interface. Fully Buffered DIMMs use commodity DRAMs isolated from the channel behind a buffer on the DIMM. The memory capacity is 288 devices per channel and total memory capacity scales with DRAM bit density.
The AMB will perform the following FBD channel functions:
• Supports channel initialization procedures as defined in the initialization chapter of the FB-DIMM Architecture and Protocol Specification to align the clocks and the frame boundaries, verify channel connectivity, and identify AMB DIMM position.
• Supports the forwarding of southbound and northbound frames, servicing requests directed to a specific AMB or DIMM, as defined in the protocol chapter, and merging the return data into the northbound frames.
• If the AMB resides on the last DIMM in the channel, the AMB initializes northbound frames.
• Detects errors on the channel and reports them to the host memory controller.
• Support the FBD configuration register set as defined in the register chapters.
• Acts as DRAM memory buffer for all read, write, and configuration accesses addressed to the DIMM.
• Provides a read buffer FIFO and a write buffer FIFO.
• Supports an SMBus protocol interface for access to the AMB configuration registers.
• Provides logic to support MemBIST and IBIST Design for Test (DFx) functions.
• Provides a register interface for the thermal sensor and status indicator.
• Functions as a repeater to extend the maximum length of FBD Links

Read the full Intel® 6400/6402 Advanced Memory Buffer Datasheet.