Reply to post: Dynamic logic?

Picking apart the circuits in the ARM1 – the ancestor of your smartphone's brain

Torben Mogensen

Dynamic logic?

IIRC, ARM2 was fully static, so you could single-step through an instruction sequence or stop the clock indefinitely. So I was surprised to hear that the flags in ARM1 used dynamic logic.

If the flag logic was the only dynamic logic on the chip, it makes good sense to change that in the redesign to get single-step capability, so it is perfectly plausible that this happened.

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