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Re: MC68060 TT Behaviour
Posted: 02 Dec 2021 11:31
by bigbloke
Might be worth looking at a small delay in the CLKEN* generation. Page 11-14 of the (NXP) 68060 datasheet has an example if migrating from 68040, and although doesn't explicitly state it, all diagrams show a 5ns delay on the clk divide by 2 to make CLKEN*
Sorry if you already seen/do this. I'm still picking up 68xxxx from when I last touched it in the 90s!
Re: MC68060 TT Behaviour
Posted: 02 Dec 2021 11:33
by terriblefire
bigbloke wrote: 02 Dec 2021 11:31
Might be worth looking at a small delay in the CLKEN* generation. Page 11-14 of the (NXP) 68060 datasheet has an example if migrating from 68040, and although doesn't explicitly state it, all diagrams show a 5ns delay on the clk divide by 2 to make CLKEN*
Sorry if you already seen/do this. I'm still picking up 68xxxx from when I last touched it in the 90s!
Yeah i've tried a bunch of delay types. :/
Re: MC68060 TT Behaviour
Posted: 02 Dec 2021 12:50
by terriblefire
OK i think something else is happening. Because TT signal was a measurement error.
Re: MC68060 TT Behaviour
Posted: 02 Dec 2021 13:22
by Badwolf
terriblefire wrote: 02 Dec 2021 12:50
OK i think something else is happening. Because TT signal was a measurement error.
I was going to ask what it looks like without the CLKEN toggle, but it was just a ghost, was it?
BW
Re: MC68060 TT Behaviour
Posted: 02 Dec 2021 13:47
by terriblefire
Badwolf wrote: 02 Dec 2021 13:22
terriblefire wrote: 02 Dec 2021 12:50
OK i think something else is happening. Because TT signal was a measurement error.
I was going to ask what it looks like without the CLKEN toggle, but it was just a ghost, was it?
BW
Actually wasnt measuring TT... its a quirk of the LA. I'll need to figure out whats really going on