SoC
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The WonderSwan SoC is a single-chip solution powering the entirety of the system's hardware - containing the CPU, most peripheral logic, as well as the internal RAM.
There exist three variants of the SoC:
- ASWAN, used in the WonderSwan,
- SPHINX, used in the WonderSwan Color,
- SPHINX2, used in the SwanCrystal.
A fourth variant, CAIRO, was planned[1]. It was designed as an ASWAN with a doubled clock speed and a built-in ADPCM decoder, but was never licensed for a commercial product.
I/O ports
System Control ($A0)
7 bit 0 ---- ---- t??? swcl | |||| | |||+- Boot ROM lockout: 0 = off, 1 = on | ||+-- Color model: 0 = no, 1 = yes | |+--- Cartridge bus width: 0 = 8-bit, 1 = 16-bit | +---- Cartridge bus speed: 0 = 1 cycle, 1 = 3 cycles +--------- MBC authentication successful?
System Control 2 ($60, color)
7 bit 0
---- ----
c4C. ?.??
|||
||+------- 1 = 4bpp "chunky"; requires all previous
|+-------- 1 = 4bpp; requires all previous
+--------- 0 = mono, 1 = color; also controls access
to WSC-specific features (extra RAM, DMA, etc.)
System Control 3 ($62, color)
7 bit 0
---- ----
S... ...p
| |
| +- 1 = Power off system
+--------- 0 = WonderSwan Color (SPHINX)
1 = SwanCrystal (SPHINX2)
