By Larry Desjardin, Modular Methods and
Lauri Viitas, Guzik Test and Measurement
One of the unique aspects of AXIe is the local bus. As reported back in the March 2013 AXIe Newsletter, the local bus is a unique bus structure that brings a lot of hidden benefits.
Figure 1. The diagram shows the local bus topology. It is a segmented bus that connects only between adjacent slots. A left to right flow allows very high speed streaming and independent use of each between vendors and applications.
Local buses are a set of short copper segments that connect pins between adjacent slots. This is why they are called “local” buses. For example, the right side of slot 2 is connected to the left side of slot 3. Then the right side of slot 3 is connected to the left side of slot 4, and so forth. Because the copper path lengths are short, only a few centimeters, very high-speed signals can be routed from slot to slot. Local buses enable high-speed private communication between related modules of an instrument set.
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