CPU

Tachyon is the codename for the main CPU of the PSP.

Tachyon has one primary CPU core which is responsible for running the XMB and games, and a second CPU core which implements the audio and video decoding functionality of the PSP.

PSP CXD2962GG

333 MHz MIPS R4000

Specifications

• Sony CXD2962GG CPU
• Based on MIPS R4000 32-bit Core
• Little-endian
• 90 nm Semiconductor CMOS Process
• 1–333 MHz (set at 222 MHz by default) @ 1.2 V
• 16 kB Instruction Cache / 16 kB Data Cache
• SiP:
  • 32 MB eDRAM @ 2.6 Gbit/s
  • Embedded FPU
• Embedded Vector FPU @ 3.2 GFLOPS

Mobile Engine "ME"

The Mobile Engine ("ME") is a second MIPS based CPU core that was not directly accessible by licensed developers. Instead, Sony runs code on the ME to facilitate decoding audio and video assets, along with the help of more specialized hardware like the Virtual Mobile Engine and

The ME runs at the same clock frequency as the main CPU core.

See Sony CXD2962GG Processor with Embedded DRAM - Chiptease Analysis Report.