Nios® V Processor Reference Manual

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ID 683632
Date 10/07/2024
Public
Document Table of Contents
Document Table of Contents x
1. Overview 2. Nios® V/c Processor 3. Nios® V/m Processor 4. Nios® V/g Processor 5. Nios V Processor Reference Manual Archives 6. Document Revision History for the Nios® V Processor Reference Manual
1. Overview x
1.1. Quartus® Prime Software Support
2. Nios® V/c Processor x
2.1. Processor Performance Benchmarks 2.2. Processor Pipeline 2.3. Processor Architecture 2.4. Programming Model 2.5. Core Implementation
2.3. Processor Architecture x
2.3.1. General-Purpose Register File 2.3.2. Arithmetic Logic Unit 2.3.3. Reset and Debug Signals 2.3.4. Memory and I/O Organization 2.3.5. Error Correction Code (ECC)
2.3.4. Memory and I/O Organization x
2.3.4.1. Instruction and Data Buses 2.3.4.2. Address Map
2.3.4.1. Instruction and Data Buses x
2.3.4.1.1. Instruction Manager Port 2.3.4.1.2. Data Manager Port 2.3.4.1.3. Choosing a Suitable Interface
2.4. Programming Model x
2.4.1. Privilege Levels
2.5. Core Implementation x
2.5.1. Instruction Set Reference
3. Nios® V/m Processor x
3.1. Processor Performance Benchmarks 3.2. Processor Pipeline 3.3. Processor Architecture 3.4. Programming Model 3.5. Core Implementation
3.1. Processor Performance Benchmarks x
3.1.1. Pipelined 3.1.2. Non-pipelined
3.2. Processor Pipeline x
3.2.1. Pipelined Architecture 3.2.2. Non-pipelined Architecture
3.3. Processor Architecture x
3.3.1. General-Purpose Register File 3.3.2. Arithmetic Logic Unit 3.3.3. Reset and Debug Signals 3.3.4. Control and Status Registers 3.3.5. Trap Controller 3.3.6. Memory and I/O Organization 3.3.7. RISC-V based Debug Module 3.3.8. Error Correction Code (ECC)
3.3.5. Trap Controller x
3.3.5.1. Exception Handling 3.3.5.2. Interrupt Handling
3.3.5.2. Interrupt Handling x
3.3.5.2.1. Timer and Software Interrupt Module
3.3.6. Memory and I/O Organization x
3.3.6.1. Instruction and Data Buses 3.3.6.2. Address Map
3.3.6.1. Instruction and Data Buses x
3.3.6.1.1. Instruction Manager Port 3.3.6.1.2. Data Manager Port 3.3.6.1.3. Choosing a Suitable Interface
3.3.7. RISC-V based Debug Module x
3.3.7.1. Debug Mode 3.3.7.2. Halt from Debug Module 3.3.7.3. Trigger 3.3.7.4. Abstract Commands in Debug Mode 3.3.7.5. Hardware/Software Interface
3.4. Programming Model x
3.4.1. Privilege Levels 3.4.2. Control and Status Registers (CSR) Mapping
3.4.1. Privilege Levels x
3.4.1.1. Machine Mode (M-mode) 3.4.1.2. Debug Mode (D-mode)
3.4.2. Control and Status Registers (CSR) Mapping x
3.4.2.1. Control and Status Register Field
3.5. Core Implementation x
3.5.1. Instruction Set Reference
4. Nios® V/g Processor x
4.1. Processor Performance Benchmarks 4.2. Processor Pipeline 4.3. Processor Architecture 4.4. Programming Model 4.5. Core Implementation
4.3. Processor Architecture x
4.3.1. General-Purpose Register File 4.3.2. Arithmetic Logic Unit 4.3.3. Multipy and Divide Units 4.3.4. Floating-Point Unit 4.3.5. Custom Instruction 4.3.6. Reset and Debug Signals 4.3.7. Control and Status Registers 4.3.8. Trap Controller 4.3.9. Memory and I/O Organization 4.3.10. RISC-V based Debug Module 4.3.11. Error Correction Code (ECC) 4.3.12. Branch Prediction 4.3.13. Lockstep Module
4.3.4. Floating-Point Unit x
4.3.4.1. IEEE 754 Exception Conditions 4.3.4.2. Floating Point Operations
4.3.4.2. Floating Point Operations x
4.3.4.2.1. Floating Point Classification
4.3.8. Trap Controller x
4.3.8.1. Exception Controller 4.3.8.2. Interrupt Controller
4.3.8.2. Interrupt Controller x
4.3.8.2.1. Timer and Software Interrupt Module
4.3.9. Memory and I/O Organization x
4.3.9.1. Instruction and Data Buses 4.3.9.2. Address Map 4.3.9.3. Cache Memory 4.3.9.4. Tightly Coupled Memory
4.3.9.1. Instruction and Data Buses x
4.3.9.1.1. Instruction Manager Port 4.3.9.1.2. Data Manager Port
4.3.9.3. Cache Memory x
4.3.9.3.1. Instruction Cache 4.3.9.3.2. Data Cache 4.3.9.3.3. Configurable Cache Memory 4.3.9.3.4. Bypassing Cache (Peripheral Region) 4.3.9.3.5. Using Cache Memory Effectively
4.3.9.4. Tightly Coupled Memory x
4.3.9.4.1. Instruction and Data Tightly Coupled Memory 4.3.9.4.2. Accessing Tightly Coupled Memory 4.3.9.4.3. Using Tightly Coupled Memory Effectively
4.3.10. RISC-V based Debug Module x
4.3.10.1. Debug Mode 4.3.10.2. Halt from Debug Module 4.3.10.3. Trigger 4.3.10.4. Abstract Commands in Debug Mode 4.3.10.5. Hardware/Software Interface
4.3.11. Error Correction Code (ECC) x
4.3.11.1. ECC Interface 4.3.11.2. ECC Error Injection 4.3.11.3. Affected CSR during ECC Event
4.4. Programming Model x
4.4.1. Privilege Levels 4.4.2. Control and Status Registers (CSR) Mapping
4.4.1. Privilege Levels x
4.4.1.1. Machine Mode (M-mode) 4.4.1.2. Debug Mode (D-mode)
4.4.2. Control and Status Registers (CSR) Mapping x
4.4.2.1. Control and Status Register Field
4.5. Core Implementation x
4.5.1. Instruction Set Reference
1. Overview
2. Nios® V/c Processor
3. Nios® V/m Processor
4. Nios® V/g Processor
5. Nios V Processor Reference Manual Archives
6. Document Revision History for the Nios® V Processor Reference Manual

4.3.11.3. Affected CSR during ECC Event

The CSRs are involved in the ECC: mcause, mtval and mtval2. For more information, refer to the Control and Status Register Field.

Table 89.  List of Affected CSR
Affected CSR Description
mcause An exception code 19 (0x13 – Hardware Error Exception) is written to the mcause.
mtval Contains the violating address when an ECC error occurs during a load/store or instruction fetch error.
mtval2 Provides more information for an ECC event. Refer to the table below.
Table 90.  List of ECC Sources based on mtval2 Bit Field
mtval2 Value ECC Error Source
0 (32’h0) No Error
1 (32’h1) GPR ECC Uncorrectable Error
3 (32’h3) FPR ECC Uncorrectable Error
16 (32’h10) Instruction TCM1 Correctable Error
17 (32’h11) Instruction TCM1 Uncorrectable Error
18 (32’h12) Instruction TCM2 Correctable Error
19 (32’h13) Instruction TCM2 Uncorrectable Error
24 (32’h18) Data TCM1 Correctable Error
25 (32’h19) Data TCM1 Uncorrectable Error
26 (32’h1A) Data TCM2 Correctable Error
27 (32’h1B) Data TMC2 Uncorrectable Error
33 (32’h21) Instruction Cache TAG RAM Uncorrectable Error
35 (32’h23) Instruction Cache Data RAM Uncorrectable Error
41 (32’h29) Data Cache TAG RAM Uncorrectable Error
43 (32’h2B) Data Cache Data RAM Uncorrectable Error
Others Reserved
Level Two Title