ARM Cortex-A15
ARM Cortex-A15 MPCore
The ARM Cortex-A15 MPCore is a 32-bit processor core licensed by ARM Holdings implementing the ARMv7-A architecture. It is a multicore processor with out-of-order superscalar pipeline running at up to 2.5 GHz.
Overview
ARM has claimed that the Cortex-A15 core is 40 percent more powerful than the Cortex-A9 core with the same number of cores at the same speed. The first A15 designs came out in the autumn of 2011, but products based on the chip did not reach the market until 2012.
Key features of the Cortex-A15 core are:
40-bit Large Physical Address Extensions (LPAE) addressing up to 1 TB of RAM with a 32-bit virtual address space.
15 stage integer/17–25 stage floating point pipeline, with out-of-order speculative issue 3-way superscalar execution pipeline
4 cores per cluster, up to 2 clusters per chip with CoreLink 400 (CCI-400, an AMBA-4 coherent interconnect) and 4 clusters per chip with CCN-504. ARM provides specifications but the licensees individually design ARM chips, and AMBA-4 scales beyond 2 clusters. The theoretical limit is 16 clusters; 4 bits are used to code the CLUSTERID number in the CP15 register (bits 8 to 11).
DSP and NEON SIMD extensions onboard (per core)
VFPv4 Floating Point Unit onboard (per core)
Hardware virtualization support
Thumb-2 instruction set encoding to reduce the size of programs with little impact on performance
TrustZone security extensions
Jazelle RCT for JIT compilation
Program Trace Macrocell and CoreSight Design Kit for unobtrusive tracing of instruction execution
32 KB data + 32 KB instruction L1 cache per core
Integrated low-latency level-2 cache controller, up to 4 MB per cluster
Chips
First implementation came from Samsung in 2012 with the Exynos 5 Dual, which shipped in October 2012 with the Samsung Chromebook Series 3 (ARM version), followed in November by the Google Nexus 10.
Press announcements of current implementations:
Broadcom SoC
HiSilicon K3V3
Nvidia Tegra 4 (Wayne) and Tegra K1.
The public source identifies “ARM Cortex-A15” as aRM Cortex-A15 MPCore. This brief keeps that definition visible, then builds a research path around Cortex-A15 and MPCore.
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