Jaguar (microarchitecture)
The AMD Jaguar Family 16h is a low-power microarchitecture designed by AMD. It is used in APUs succeeding the Bobcat Family microarchitecture in 2013 and being succeeded by AMD's Puma architecture in 2014. It is two-way superscalar and capable of out-of-order execution. It is used in AMD's Semi-Custom Business Unit as a design for custom processors and is used by AMD in four product families: Kabini aimed at notebooks and mini PCs, Temash aimed at tablets, Kyoto aimed at micro-servers, and the G-Series aimed at embedded applications. Both the PlayStation 4 and the Xbox One use SoCs based on the Jaguar microarchitecture, with more powerful GPUs than AMD sells in its own commercially available Jaguar APUs.
Design
- 32 KiB instruction + 32 KiB data L1 cache per core, L1 cache includes parity error detection
- 16-way, 1–2 MiB unified L2 cache shared by two or four cores, L2 cache is protected from errors by the use of error correcting code
- Out-of-order execution and speculative execution
- Integrated memory controller
- Two-way integer execution
- Two-way 128-bit wide floating-point and packed integer execution
- Integer hardware divider
- Consumer processors support two DDR3L DIMMs in one channel at frequencies up to 1600 MHz
- Server processors support two DDR3 DIMMs in one channel at frequencies up to 1600 MHz with ECC
- As a SoC it integrates Fusion controller hub
- Jaguar does not feature clustered multi-thread, meaning that execution resources are not shared between cores
Instruction-set support
The Jaguar core has support for the following instruction sets and instructions: MMX, SSE, SSE2, SSE3, SSSE3, SSE4a, SSE4.1, SSE4.2, AVX, F16C, CLMUL, AES, BMI1, MOVBE, XSAVE/XSAVEOPT, ABM, and AMD-V.Improvements over Bobcat
- Over 10% increase in clock frequency
- Over 15% improvement in instructions per clock
- Added support for SSE4.1, SSE4.2, AES, CLMUL, MOVBE, AVX, F16C, BMI1
- Up to four CPU cores
- L2 cache is shared between cores
- FPU datapath width increased to 128-bit
- Added hardware integer divider
- Enhanced cache prefetchers
- Doubled bandwidth of load–store units
- C6 and CC6 low power states with lower entry and exit latency
- Smaller, 3.1 mm2 area per core
- Integrated Fusion controller hub
- Video Coding Engine
Processors
Desktop
SoCs using Socket AM1:Jaguar derivative and successor
In 2017, a derivative of the Jaguar microarchitecture was announced in the APU of Microsoft's Xbox One X (Project Scorpio) revision to the Xbox One. The Project Scorpio APU is described as a 'customized' derivative of the Jaguar microarchitecture, utilizing eight cores clocked at 2.3 GHz.The Puma successor to Jaguar was released in 2014 and targeting entry level notebooks and tablets.