ARM Technical Support Knowledge Articles

Are there any known problems with the BERROR signal? (Rev 0-3)

Applies to: ARM720T

Answer

Yes. The ASB specification says that BERROR is sampled on the BCLK rising edge. For ARM720T, BERROR needs to be valid on both BCLK rising and falling edges. This does not typically present a problem in an ASB system, as BERROR should be driven only during the BCLK low phase and should be tri-stated during the BCLK high phase. Bus-keeper cells would typically be used to retain the old value during this time.

Article last edited on: 2008-09-09 15:47:36

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