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Mongoose 2 µarch
General Info
Arch Type	CPU
Designer	Samsung
Manufacturer	Samsung
Introduction	February 23, 2017
Phase-out	2018
Process	10 nm
Core Configs	4
Pipeline
OoOE	Yes
Speculative	Yes
Reg Renaming	Yes
Stages	14
Decode	4-way
Instructions
ISA	ARMv8
Cache
L1I Cache	64 KiB/core 4-way set associative
L1D Cache	32 KiB/core 8-way set associative
L2 Cache	2 MiB/cluster 16-way set associative
Succession
M1 M3

Exynos Mongoose 2 (M2) is the successor to the Mongoose 1, a 10 nm ARM microarchitecture designed by Samsung for their consumer electronics.

Process Technology

M2 was fabricated on Samsung's first generation 10LPE (Low Power Early) process.

Compiler support

Compiler	Arch-Specific	Arch-Favorable
GCC	-mcpu=exynos-m1	-mtune=exynos-m1
LLVM	-mcpu=exynos-m2	-mtune=exynos-m2

Architecture

Key changes from Mongoose 1

• 10nm (10LPE) process (from 14 nm)
• Larger ROB (100, up from 96)

This list is incomplete; you can help by expanding it.

Block Diagram

Core Cluster Overview

(Cluster identical to Mongoose 1)

Individual Core

Memory Hierarchy

• Cache
  • L1I Cache
    • 64 KiB, 4-way set associative
      • 128 B line size
      • per core
    • Parity-protected
  • L1D Cache
    • 32 KiB, 8-way set associative
      • 64 B line size
      • per core
    • 4 cycles for fastest load-to-use
    • 16 B/cycle load bandwidth
    • 16 B/cycle store bandwidth
  • L2 Cache
    • 2 MiB, 16-way set associative
      • 4x banks (512 KiB each)
    • Inclusive of L1
    • 22 cycles latency
    • 16 B/cycle/CPU bandwidth

The M2 TLB consists of dedicated L1 TLB for instruction cache (ITLB) and another one for data cache (DTLB). Additionally there is a unified L2 TLB (STLB).

• TLBs
  • ITLB
    • 256-entry
  • DTLB
    • 32-entry
  • STLB
    • 1,024-entry
    • Per core

• BPU
  • 4K-entry main BTB
  • 64-entry µBTB
  • 64-entry return stack
  • 8K-entry L2 BTB

Core

The M2 core is almost identical to the M1.

All M2 Processors

	List of M2-based Processors
	Main processor						Integrated Graphics
Model	Family	Launched	Arch	Cores	Frequency	Turbo	GPU	Frequency
Count: 0