ARM Cortex-A57
| Designed by | ARM Holdings |
|---|---|
| Microarchitecture | ARMv8-A |
| Cores | 1–4 per cluster, multiple clusters[1] |
| L1 cache | 80 KiB (48 KiB I-cache with parity, 32 KiB D-cache with ECC) per core |
| L2 cache | 512 KiB to 2 MiB |
| L3 cache | none |
The ARM Cortex-A57 is a microarchitecture implementing the ARMv8-A 64-bit instruction set designed by ARM Holdings. The Cortex-A57 is an out-of-order superscalar pipeline.[1] 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 4 or 8 Cortex-A57 cores, support for up to 128 GiB of DDR3 or DDR4 RAM, an 8-lane PCIe controller, 8 SATA (6 Gbit/s) ports, and two 10GigE ports.[2]
Qualcomm's first offering which was made available for sampling Q4 2014 was the Snapdragon 810.[3][4] It contains 4xCortex-A57 + 4xCortex-A53 cores in a big.LITTLE configuration.
Samsung also provides Cortex-A57-based SOC's, the first one being Exynos Octa 5433 which was available for sampling from Q4 2014.
