Connecting it all together - AMD's Hyper-Transport
nForce uses AMD's Hyper Transport protocol to connect the IGP and MCP components of the chipset. Hyper Transport was originally known as Lightning Data Transport (LDT) but was renamed earlier this year. The technology has been disclosed to over 100 manufacturers, NVIDIA being one of the larger players with access to the technology.
Hyper Transport is a very elegant dual ported serial link that can connect anything from a North Bridge and South Bridge (which is the case here) to two multiprocessor North Bridges.
The two ports on the bus link are used for incoming and outgoing traffic; they can each be between 2 and 32-bits wide. The implementation used in the nForce has a link width of 8-bits and an operating frequency of 200MHz. The bus is double pumped meaning that the effective transfer rate is equal to that of a 400MHz bus. This gives the nForce 400MB/s of bandwidth in any one direction or 800MB/s total bandwidth between the IGP and the MCP.
Should the need arise, NVIDIA can always increase the width of the Hyper Transport bus and/or increase the operating frequency but for now 400MB/s unidirectional bandwidth should be enough.
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Drudy - Tuesday, June 1, 2021 - link
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