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Re: 68060, DBxx loop and IRQs

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On 9/15/2025 1:49 PM, Ralf Kiefer wrote:
> Hi,
> 
> this is a question hopefully reaching the (small) 68060 community :-)
> 
> Talking about former times we remembered an issue of the 68060 CPU: no
> IRQ handling when in a DBxx loop. But nobody was there who knew real
> facts. Then I asked startpage, duckduckgo .. but no hint. I read my old
> books, the 060 User's manual and the 68000 Family Reference Manual.
> Nothing.
> 
> In a German web forum somebody asked ChatGPT. Better than nothing. But
> do you believe in a language model?
> 
> I have a couple of questions:
> - This issue seems to be a 060 issue. Correct?
> - Are there dependencies to the mask? Back in the 1990s we used some
> MVME177, the CPUs were XC68060, we had 2 masks: 1F43G and 1G65V.
> - Are IRQs blocked just in a DBxx loop without any instruction inside?
> - Which IRQs are involved: just the external IRQs from the peripherals
> (level 1..7) or also internal exceptions like an Address Error or any
> TRAP?
> 
> Regards
> Ralf

Have you checked the errata?
https://www.nxp.com/docs/en/errata/MC68060DE.pdf

I do remember getting MVME177's with XC68060 parts on them because Motorola was taking so long to deliver the 68060. I don't remember having any problems with them.

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68060, DBxx loop and IRQs R.Kiefer.SPAEM@gmx.de (Ralf Kiefer) - 2025-09-15 22:49 +0200
  Re: 68060, DBxx loop and IRQs Buzz McCool <buzz_mccool@yahoo.com> - 2025-09-24 10:59 -0700
    Re: 68060, DBxx loop and IRQs R.Kiefer.SPAEM@gmx.de (Ralf Kiefer) - 2025-09-25 14:13 +0200

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