The document" MB91460 Series User’s Manual", Version 1.10, 2007-03-09 (Fujitsu document), section 12, "Instruction Cache", states there is an cache for external memory. Section 12.4, "Cacheable areas in the instruction cache" says: "The instruction cache can cache data only in external bus space."
At least this issue is cleared with the latest version of hardware manual.
There is no cache for external memory implemented for the 467D variant. The old version was not clear about that.
Hmmmm, perhaps there is no issue known ...
And I cannot reproduce the issue either. I don't notice any negative side effects with enabled caches.
But to add still another follow-up:
Has anyone a description of the full chip designation for the MB91F46x ?
Those full designations use to encode temperature class, casing, manufacturing place and time, and, most importantly, chip revision.
To give two examples of actual chips:
What is the difference between both chips ?
I checked both the last Fujitsu documentation (still named "preliminary") and the latest Cypress datasheets, but did not find anything in this regard.
Somebody supposedly moved this question to the "MCU->Auto MCU" section, not sure how that seems more appropriate ...
However, I'm in contact with a Cypress representative directly regarding this issue, and currently wait for a full errata list.