Krait (processor)

Qualcomm Krait is an ARM-based central processing unit included in the Snapdragon S4 and earlier models of Snapdragon 400/600/800 series SoCs. It was introduced in 2012 as a successor to the Scorpion CPU and although it has architectural similarities, Krait is not a Cortex-A15 core, but it was designed in-house.^[1] In 2015, Krait was superseded by the 64-bit Kryo architecture, first introduced in Snapdragon 820 SoC.

Krait

General information
Launched	2012
Designed by	Qualcomm
Common manufacturer	Qualcomm
Performance
Max. CPU clock rate	1 GHz to 2.7 GHz
Cache
L1 cache	16 KiB and 16 KiB
L2 cache	1 MiB or 2 MiB
Architecture and classification
Instruction set	ARMv7-A, Thumb-2
Physical specifications
Cores	2 or 4
History
Predecessor	Scorpion
Successor	Kryo

Overview

• 11-stage integer pipeline with 3-way decode and 4-way out-of-order speculative issue superscalar execution
• Pipelined VFPv4^{[2][under discussion]} and 128-bit wide NEON (SIMD)
• 7 execution ports
• 4 KB + 4 KB direct mapped L0 cache
• 16 KB + 16 KB 4-way set associative L1 cache
• 1 MB (dual-core) or 2 MB (quad-core) 8-way set-associative L2 cache
• Dual- or quad-core configurations
• Performance (DMIPS/MHz):
  • Krait 200: 3.3 (28 nm LP)
  • Krait 300: 3.39^[3] (28 nm LP)
  • Krait 400: 3.39 (28 nm HPm)
  • Krait 450: 3.51 (28 nm HPm)

See also

• Scorpion (CPU)
• Kryo (microarchitecture)
• Comparison of ARMv7-A cores
• List of Qualcomm Snapdragon processors