The revised core ppc405_virtex4_v1_01_a is expected to be a drop-in = replacement for v1_00_a under all conditions, and this is the first = report I've seen indicating any problems resulting from upgrading to it. = The fix in v1.01.a redefines the default value of parameter = C_APU_CONTROL to avoid a potential intermittent PPC start-up failure = that had been observed in some (not all) V4FX designs when the APU = interface is not used. Assuming your design does not use the APU = interface, an alternative to upgrading the PPC is to just set parameter = C_APU_CONTROL =3D 0b1101111000000000 on the ppc405_virtex4_v1_00_a = instance in your design to guard against the potential start-up failure, = as described in Xilinx Answer Record: 22179. In designs that use APU, = the fix is irrelevant, so upgrading the PPC could just be bypassed.
Please let me know if you continue have difficulty with this issue after = trying the above workaround.
Regards, Jeff Seltzer, Xilinx Embedded Processor snipped-for-privacy@xilinx.com
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