Hardware

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CPU

  • IBM 'Broadway' 90 nm based on IBM's Power architecture.
  • Runs at a speed of 729 Mhz. Maximum Bandwidth is 1.9 GB/s.
  • Bus to main memory: 243 MHz, 64 bits (maximum bandwidth: 1.9 GB/s)
  • 32 KB 8-way set-associative L1 instruction cache
  • 32 KB 8-way set-associative L1 data cache (can set up 16-kilobyte data scratch pad)
  • Superscalar microprocessor with six execution units (floating-point unit, branching unit, system regis

ter unit, load/store unit, two integer units)

  • DMA unit (15-entry DMA request queue) used by 16-kilobyte data scratch pad
  • Write-gather buffer for writing graphics command lists to the graphics chip
  • Onboard 256-kilobyte 2-way set-associative L2 integrated cache
  • Two, 32-bit integer units (IU)
  • One floating point unit (FPU) (supports single precision (32-bit) and double precision (64-bit))
  • The FPU supports paired single floating point (FP/PS)
  • The FPU supports paired single multiply add (ps_madd). Most FP/PS instructions can be issued in

each cycle and completed in three cycles.

  • Fixed-point to floating-point conversion can be performed at the same time as FPU register load and

store, with no loss in performance.

  • The branch unit supports static branch prediction and dynamic branch prediction.
  • When an instruction is stalled on data, the next instruction can be issued and executed. All instructions

maintain program logic and will complete in the correct program order.

  • Supports three L2 cache fetch modes: 32-Byte, 64-Byte, and 128-Byte.
  • Supports these bus pipeline depth levels: level 2, level 3, and level 4.

Reference Information: Broadway is upward compatible with Nintendo GameCube’s CPU (Gekko).

Graphics

  • ATi 'Hollywood' processor
  • Runs at a speed of 243 mhz.

Includes:

  • Graphics processing unit (with 3 megabytes of eDRAM)
  • Audio DSP
  • I/O Bridge
  • 24 megabytes of internal main memory
  • Internal main memory operates at 486 MHz.

Maximum bandwidth between Hollywood and internal main memory: 3.9 gigabytes per second

  • Possible to locate a program here

Reference Information: Hollywood is similar to Nintendo GameCube’s Flipper and Splash components.

The Hollywood is a multi-chip package composed of two dies, named Vegas and Napa. Vegas is the GPU, and is also responsible for I/O functions, including memory access. Napa is the DSP, and includes 24 MiB of 1T RAM on the die. Vegas has direct access to 3 MiB of 1T RAM for use as a frame buffer and texture storage.

  • Qimonda HYB18HS1232 64 MiB GDDR3 graphics RAM

Memory

  • Elpida S1616AGTA 16-Mbit SDRAM
  • Samsung K9F4G08U0A 65-nm, 4-Gbit NAND flash
  • 64 MB of GDDR3 (MEM2) as the external main memory. Can be accessed from the CPU and GPU with a bandwidth of 4GB/s and can also store programs in the MEM2.

Optical Drive

  • Supports single sided 4.7 GB and the double sided 8.51 GB. Nintendo GC discs also supported.

Wireless

  • Broadcom BCM4318 Wi-Fi transceiver
  • Broadcom BCM2045 Bluetooth device connected via USB

References

  1. http://www.techonline.com/showArticle.jhtml?articleID=194500380
  2. http://techon.nikkeibp.co.jp/english/NEWS_EN/20061127/124495/