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Airmont µarch

General Info

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Airmont is Intel's 14 nm microarchitecture for the Atom family of system on chips. Introduced in 2015, Airmont is a shrink of Silvermont.

Codenames

Platform	Core	Target
Cherry Trail	Cherry Trail	Smartphones, Tablets
Braswell	Braswell	Tablets, PCs

Architecture

Airmont is for the most part identical to Silvermont with some higher number of execution units to the GPU in some of the higher-end models.

Key changes from Silvermont

• DTLB table size doubled (128 entries -> 256 entries)
• L2 latency increased
• Reorder Buffer was increased (from 32 entries to 48)
• Gen 8 GPUs

Block Diagram

Memory Hierarchy

• Cache
  • Hardware prefetchers
  • L1 Cache:
    • 32 KB 8-way set associative instruction, 64 B line size
    • 24 KB 6-way set associative data, 64 B line size
    • Per core
  • L2 Cache:
    • 1 MB 16-way set associative, 64 B line size
    • Per 2 cores
  • L3 Cache:
    • No level 3 cache
  • RAM
    • Maximum of 1GB, 2 GB, and 4 GB
    • dual 32-bit channels, 1 or 2 ranks per channel

Multithreading

Silvermont dropped support for Intel Hyper-Threading Technology.

Pipeline

Main article: Silvermont's Pipeline

Airmont's pipeline is identical to Silvermont's.

Cores

• Cherry Trail - SoCs for Smartphones/Tablets
• Braswell - SoCs for low-end PCs