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WuDaoKou µarch
General Info
Arch Type	CPU
Designer	Zhaoxin
Manufacturer	HLMC
Introduction	December 28, 2017
Process	28 nm
Core Configs	2, 4, 8
Pipeline
Type	Superscalar
OoOE	Yes
Speculative	Yes
Reg Renaming	Yes
Instructions
ISA	x86-64
Succession
Zhangjiang LuJiaZui

WuDaoKou is the successor to Zhangjiang, a 28 nm x86 microarchitecture designed by Zhaoxin for mainstream laptops, desktops, and servers.

Brands

Family	Series	Description
KaiXian	KX (5000)	Desktop, Laptops
Kaisheng	KH (20000)	Storage, Servers

Process Technology

WuDaoKou is manufactured on HLMC's 28 nm process.

Architecture

Key changes from Zhangjiang

• 1.4x performance
• 8 cores per die (up from 4)
• SoC design
  • New Uncore
    • northbridge moved on-die
    • PCIe 3.0 (from 2.0)
    • DDR4 (From DDR3)
  • New integrated graphics processor
    • HD Audio Output/Codec
• Core
  • Pipeline was reduced by 5 stages
  • Execution engines were re-balanced
  • Branch prediction unit was reworked and optimized
• FSB removed
  • x4 PCIe 3.0 communication with southbridge chipset
• Chipset
  • Gigabit Ethernet port (RGMII)
  • USB 3.1 Gen2 (Type-C) ports
  • SATA 3.0 ports

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

Block Diagram

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Memory Hierarchy

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Die

• HLMC 28 nm process
• 187 mm² die size
• 2,100,000,000 transistors