SiFive E21
SiFive · Essential E 系列
32 bit
In production
Commercial license
MPU
Bit width
32bit
Max frequency
Not published
Pipeline
2–8 级、单/双发射顺序（E 系列 Gen4 可配置）
CoreMark/MHz
—
License
Commercial license
Maturity
In production
Architecture and ISA
| Vendor / Origin | SiFive（United States） |
|---|---|
| Bits / ISA | 32 bit · RV32IMC |
| Pipeline | 2–8 级、单/双发射顺序（E 系列 Gen4 可配置） The vendor or source notes are in Chinese in the original |
| Features | MPU |
| Max frequency | Not published |
Ecosystem and toolchain
| Toolchain | SiFive Freedom Studio / RISC-V GNU Toolchain |
|---|---|
| Operating systems | FreeRTOS / Zephyr / 裸机 |
| Representative silicon | — |
| MCUs with this brand in the catalog | 5 MCU (not all of them use this core) |
Sources and notes
The vendor or source notes are in Chinese in the original SiFive 已将 E21 合并进 Essential E 系列 Gen4 页面：32 位、2–8 级单/双发射可配、最高 2.9 DMIPS/MHz 与 5.9 CoreMark/MHz（全系列口径），E21 为其中最小配置。官方不再单列 E21 的流水线级数与频率，故 pipeline 写系列范围、freq=null；isa 按 E21 公开资料为 RV32IMC。
Last verified 2026-11-04