NV40:G80 clocks¶
Todo
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Introduction¶
NV40 generation cards have the following clocks:
- host clock: clocks the host interface parts, like PFIFO
- core clock [NVPLL]: clocks most of the card’s logic
- unknown clock 4008
- video clocks [VPLL1,VPLL2]: used to drive the video outputs
- memory clocks [MPLL1-MPLL4]: used to clock the VRAM, there’s one of them for each memory partition connected to the card
- unknown clock 4050 - not present on all cards
- unknown clock 4058 - not present on all cards
Todo
figure out where host clock comes from
Todo
figure out 4008/shader clock
Todo
figure out 4050, 4058
The clocks other than VPLLs are set through the new PCLOCK area, VPLLs are set through PRAMDAC like on NV3.
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HCLK: host clock¶
Todo
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