本文介绍了一款基于RISCV架构的快速可编程中断控制器(FPIC), 相比较标准RISCV中断控制器PLIC, FPIC具备硬件压栈(HPE)和免表(VTF)中断技术。对比沁恒自研RISCV微处理器青稞V4的中断控制器FPIC与 PLIC中断处理流程的差异, 并以通用32位互联型MCU赤菟V307为实验芯片, 验证开启与不开启HPE、VTF模式时的中断延迟实测差异。

In the paper, a fast-programmable interrupt controller(FPIC) based on the RISCV architecture is introduced.Compared with the standard RISCV interrupt controler PLIC, FPIC has the HPE and VTF interrupt technology.Compare the difference of interrupt processing flow between FPIC and PLIC of WCH self-developed RISCV microprocessor Qingke V4, and take the general 32bit interconnected MCU Chitu V307 as the experimental chip to verify the measured difference of interrupt latency between on and off HPE and VTF modes.