Apple Power Macintosh G3 Minitower Spezifikationen PDF herunterladen (Seite 96)

Basics PowerPC G3 and Backside Cache - 80

PowerPC G3 and Backside Cache

Backside cache is a significant architectural design change

from earlier PowerPC processors. The main advantage of the

backside cache architecture is the speed of the dedicated

CPU-to-L2 cache interface. Using the dedicated bus allows

the CPU to access the fast L2 cache storage through a high

speed bus without addressing the slower system bus or

competing with other devices attached to the system bus. In

comparison, a “far-side” cache running on the system bus

would limit that SRAM interface to 50MHz.

The PowerPC G3 microprocessor interfaces with SRAM

storage via a dedicated bus running at various multiples of

the core PLL CPU speed. With high speed L2 SRAM and a

dedicated L2 bus, the CPU can access stored information up

to the speed of the processor clock. L2 access is determined

by the clock ratio setting. For example, with a 250MHz

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Apple Power Macintosh G3 Minitower Spezifikationen Seite 96