Does anyone know if the internall PLL on an Intel 80486 can be by-passed or disabled?
I want to single step using an externally controlled clock without the PLL.
Thanks, Wayne
486 pll
Jul 25, 2005
2 Replies
Doubtful unless it's a fully-static core.
You can't. The PLL feeds the internal clock. It can't be bypassed.
If you want to single step you *must* use the TAP (Test Access Port) which is JTAG derived.
There is no other way to do this.
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