backside cache


Also found in: Dictionary, Thesaurus, Medical, Legal.

backside cache

(hardware, processor)
An implementation of secondary cache memory that allows it to be directly accessed by the CPU.

Backside cache is used by Apple Computers, Inc. in their PowerPC G3 processor. Previous PowerPC processors used the system bus to access both secondary cache and main memory. In the PowerPC G3 a dedicated bus handles only CPU/cache transactions. This bus can operate faster than the system bus thus improving the overall performance of the processor.

The term apparently derives from the relocation of the secondary cache from the motherboard to the processor card itself, i.e. on the backside of the processor card.

backside cache

A level 2 memory cache that has a dedicated channel to the CPU, enabling it to run at the full speed of the CPU. See inline cache and lookaside cache.
References in periodicals archive ?
Titanium PowerBook G4 with PowerPC G4 500 MHz processor with 1MB level 2 backside cache, 256MB PC-100 SDRAM, 20GB Ultra ATA/66 hard drive, ATI RAGE Mobility 128 featuring AGP 2X support and 8MB SDRAM of video memory, built-in 10/100BASE-T Ethernet, FireWire and USB ports, VGA and S-Video ports, AirPort ready, built-in 56K V.
Each core has a dedicated 128 KB L2 backside cache and access to 2MB of shared frontside L3 cache.
The card combines a 466MHz G3 CPU - using copper interconnect technology - with 1Mb of backside cache memory running on a 233MHz bus.
Each core has a dedicated L2 backside cache, sized for optimal performance, and access to a large frontside L3 cache.