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How to detect the cable A/B status with Quantum S908 network

Background:
The manual indicates the %SW536~%SW541 as the registers to detect the cable A/B with Quantum S908 network. However, they are all zero during the test with 140CPU67160(SV3.3).
 
Question:
How to detect the cable A/B status with Quantum S908 network
 
Answer:
The feature how cpu treats system registers depends on OS version. By SV3.3, the CRP detected the cable A/B error & refreshed  its status through %SW542~%SW544
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