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Reset Traces: Difference between revisions
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The SNES has a few traces used in system resetting: | The SNES has a few traces used in system resetting: | ||
[[File:reset schematic.png|schematic of the various reset traces]] | |||
/'''RESOUT0''' allows [[S-PPU2]] to reset [[S-PPU1]]. It is produced by pin 33 of PPU2 and goes into pin 83 (/RESET) of PPU1. It is not connected to anything else. | /'''RESOUT0''' allows [[S-PPU2]] to reset [[S-PPU1]]. It is produced by pin 33 of PPU2 and goes into pin 83 (/RESET) of PPU1. It is not connected to anything else. | ||
Revision as of 18:42, 28 May 2023
The SNES has a few traces used in system resetting:
/RESOUT0 allows S-PPU2 to reset S-PPU1. It is produced by pin 33 of PPU2 and goes into pin 83 (/RESET) of PPU1. It is not connected to anything else.
/RESOUT1 is produced by pin 28 of S-PPU2 and passes through R74 before combining with the voltage supervisor reset output. Then, RESOUT1 goes into these pins, all of which are labled /RESET:
- pin 50 of the S-CPU
- pin 8 of WRAM
- pin 26 of the Cartridge Slot
- pin 37 of the S-SMP
- pin 19 of the Expansion Port
- pin 47 of the S-DSP
The trace (not pin) labeled /RESET on the jwdonal schematic is produced by pin 10 (P10) of the CIC and is what actually resets PPU2 (going into pin 34).