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Address Bus A: Difference between revisions
From SnesLab
(what it is connected to is more important usually) |
(pin 33 of WRAM is GND and pin 32 is VCC) |
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It is connected to: | It is connected to: | ||
* [[S-CPU]] pins 2-17 and 93-100 | * [[S-CPU]] pins 2-17 and 93-100 | ||
* [[WRAM]] pins 23-42 | * [[WRAM]] pins 23-31 and pins 34-42 | ||
* [[Cartridge Slot]] pins | * [[Cartridge Slot]] pins 6-17 and 37-48 | ||
It is 24 bits wide because that is how big the SNES' address space is. | It is 24 bits wide because that is how big the SNES' address space is. It can address up to 16 megabytes, which is enough for most games, but some games use bank switching to address even more. | ||
[[File:Bus A.png|thumb]] | [[File:Bus A.png|thumb]] | ||
Latest revision as of 19:44, 18 August 2024
Address Bus A is a 24-bit bus on the SNES. It is drawn in orange in the colorized jwdonal schematic, and its individual address lines are labeled CA0-CA23.
It is connected to:
- S-CPU pins 2-17 and 93-100
- WRAM pins 23-31 and pins 34-42
- Cartridge Slot pins 6-17 and 37-48
It is 24 bits wide because that is how big the SNES' address space is. It can address up to 16 megabytes, which is enough for most games, but some games use bank switching to address even more.
See Also
Reference
- Figure 2-22-1, "Super NES Functional Block Diagram" on page 2-22-2 of Book I