ARM Cortex-A57
microarchitecture implementing the ARMv8-A 64-bit instruction set designed by ARM Holdings
The ARM Cortex-A57 is a central processing unit implementing the ARMv8-A 64-bit instruction set designed by ARM Holdings. The Cortex-A57 is an out-of-order superscalar pipeline. It is available as SIP core to licensees, and its design makes it suitable for integration with other SIP cores (e.g. GPU, display controller, DSP, image processor, etc.) into one die constituting a system on a chip (SoC).
Overview
Pipelined processor with deeply out of order, speculative issue 3-way superscalar execution pipeline
DSP and NEON SIMD extensions are mandatory per core
VFPv4 Floating Point Unit onboard (per core)
Hardware virtualization support
Thumb-2 instruction set encoding reduces the size of 32-bit programs with little impact on performance.
TrustZone security extensions
Program Trace Macrocell and CoreSight Design Kit for unobtrusive tracing of instruction execution
32 KiB data (2-way set-associative) + 48 KiB instruction (3-way set-associative) L1 cache per core
Integrated low-latency level-2 (16-way set-associative) cache controller, 512 KB, 1 MB, or 2 MB configurable size per cluster
48-entry fully associative L1 instruction Translation Lookaside Buffer (TLB) with native support for 4 KiB, 64 KiB, and 1 MB page sizes
4-way set-associative of 1024-entry L2 TLB
2-level dynamic predictor with Branch Target Buffer (BTB) for fast target generation
Static branch predictor
Indirect predictor
Return stack
Chips
In January 2014, AMD announced the Opteron A1100. Intended for servers, the A1100 has four or eight Cortex-A57 cores, support for up to 128 GiB of DDR3 or DDR4 RAM, an eight-lane PCIe controller, eight SATA (6 Gbit/s) ports, and two 10 Gigabit Ethernet ports. The A1100 series was released in January 2016, with four and eight core versions.
Qualcomm's first offering which was made available for sampling Q4 2014 was the Snapdragon 810. It contains four Cortex-A57 and four Cortex-A53 cores in a big.LITTLE configuration.
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