21. Revision History

Warning

For latest version of Nuclei ISA Spec since 2022, please get it from AE of Nuclei System Technology. This online version is out of date.

21.1. 2.0.3

• Change the mcache_ctl[1]/scrathpad mode default value to be 1 after reset

• Add Nuclei ECC CSRs

• Add ECC Introduction

• Update TIMER to be compatiable with CLINT mode for UX class to run Linux

• Update the PLIC registers memory map

21.2. 2.0

• Added MMU Introduction chapter

• Added Nuclei CCM Mechanism chapter

• Added the following CSRs

  • milm_ctl

  • mdlm_ctl

  • mppicfg_info

  • mfiocfg_info

  • micfg_info

  • mdcfg_info

  • mcfg_info

• Modified the following CSRs

  • mcache_ctl

  • mmisc_ctl

• DSP feature is upgraded to match RISC-V “P” Extension Proposal release 0.5.4

21.3. 1.5

• First version of Nuclei RISC-V ISA in English

• DSP feature match RISC-V “P” Extension Proposal release 0.5.0