HYS72T64400HFA Datasheet, PDF(13/47 Page) Qimonda AG – 240-Pin Fully-Buffered DDR2 SDRAM Modules

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HYS72T64400HFA Datasheet, PDF (13/47 Pages) Qimonda AG – 240-Pin Fully-Buffered DDR2 SDRAM Modules

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Internet Data Sheet

HYS72T[64/128/256]4[00/20]HFAâ[2.5/3S/3.7]âB

Fully-Buffered DDR2 SDRAM Modules

FIGURE 2

Block Diagram Advanced Memory Buffer Interface

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Interface Topology

The FB-DIMM channel uses a daisy-chain topology to provide

expansion from a single DIMM per channel to up to 8 DIMMs

per channel. The host sends data on the southbound link to

the first DIMM where it is received and redriven to the second

DIMM. On the southbound data path each DIMM receives the

data and again re-drives the data to the next DIMM until the

last DIMM receives the data. The last DIMM in the chain

initiates the transmission of data in the direction of the host

(a.k.a. northbound). On the northbound data path each DIMM

receives the data and re-drives the data to the next DIMM

until the host is reached.

FIGURE 3

Block Diagram of Channel Southbound and Northbound Paths

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Rev.1.01, 2007-06-20

13

10062006-RQWY-GI6S

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