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Xiaomi µarch
General Info
Arch Type	CPU
Designer	Phytium
Manufacturer	TSMC
Introduction	2017
Process	28 nm
Pipeline
Type	Superscalar
Speculative	Yes
Reg Renaming	Yes
Instructions
ISA	ARMv8
Cores
Core Names	FTC660, FTC661

Xiaomi is an ARM microarchitecture designed in-house by Phytium for their consumer market and server-based microprocessors.

Brands

Codename	Brand	Description
Mars	FT-2000	High performance High bandwidth, Large memory High bandwidth I/O Large scale cache coherency
Earth	FT-1500A	Moderate performance High power efficiency High density computing Low cost

Architecture

Overview

• Fully ARMv8 compatible
  • Support AArch32 and AArch64 modes
  • EL0-EL3 supported
  • ASIMD-128
• 28 nm process
• Scalable design
  • 4 to 64 cores
• Mesh topology network-on-chip
• Panel-based (grid) architecture
• Global cache coherency
• 2x DDR3-1600 channels per panel
  • ECC support
• 2x 16-lane PCIe 3.0

Panel Architecture

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Block Diagram

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Memory Hierarchy

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Pipeline

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References

• Zhang, C. (2015, August). Mars: A 64-core ARMv8 processor. In Hot Chips 27 Symposium (HCS), 2015 IEEE (pp. 1-23). IEEE.