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AR# 23666

MPMC2 - OPB PIM double access occurs w/ 32 bit data accesses across the PLB2OPB bridge

Description

Transactions mapped across the PLB2OPB bridge result in one 64-bit PLB transaction being translated to two 32-bit OPB accesses. This results in two accesses occuring even when only 32 bits PLB are enabled using the byte enable flags. One of the two accesses on the OPB bus becomes a dummy access with all byte enables set to zero. This can cause a reduction in performance.

Solution

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AR# 23666
Date Created 07/05/2006
Last Updated 11/12/2010
Status Archive
Type General Article