There will be three main docs to help user ramp up using the Hummingbird E200 Series Processor Core:
Hummingbird_E200_Series_Core_SoC_Introduction.pdf
Hummingbird_E200_Series_Core_SoC_Quick_Start_Guide.pdf
Hummingbird_E200_Coprocessor_Extension_Quick_Start_Guide.pdf
The Hummingbird E200 Core was deeply introduced in the published Book (蜂鸟E200处理器核在如下出版书籍中进行深入浅出的分析讲解):
《手把手教你设计CPU：RISC-V处理器》（尚未上市）
The SoC introduction doc can be seen from:
HBird_OpenSource_MCU_SoC_Spec.pdf