Nios® V Processor Reference Manual

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ID 683632
Date 3/28/2022
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Document Table of Contents
Document Table of Contents x
1. About this Document 2. Nios® V/m Processor 3. Document Revision History for the Nios® V Processor Reference Manual
1. About this Document x
1.1. Overview
2. Nios® V/m 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. Control and Status Registers 2.3.4. Exception Controller 2.3.5. Interrupt Controller 2.3.6. Memory and I/O Organization 2.3.7. RISC-V based Debug Module
2.3.5. Interrupt Controller x
2.3.5.1. Timer and Software Interrupt Module
2.3.6. Memory and I/O Organization x
2.3.6.1. Instruction and Data Buses
2.3.6.1. Instruction and Data Buses x
2.3.6.1.1. Instruction Manager Port 2.3.6.1.2. Data Manager Port 2.3.6.1.3. Address Map
2.3.7. RISC-V based Debug Module x
2.3.7.1. Debug Mode 2.3.7.2. Halt from Debug Module 2.3.7.3. Debug Implementation 2.3.7.4. Abstract Commands in Debug Mode 2.3.7.5. Hardware/Software Interface
2.4. Programming Model x
2.4.1. Privilege Levels 2.4.2. Control and Status Registers (CSR) Mapping
2.4.1. Privilege Levels x
2.4.1.1. Machine Mode (M-mode) 2.4.1.2. Debug Mode (D-mode)
2.4.2. Control and Status Registers (CSR) Mapping x
2.4.2.1. Control and Status Register Field
2.5. Core Implementation x
2.5.1. Instruction Set Reference
1. About this Document
2. Nios® V/m Processor
3. Document Revision History for the Nios® V Processor Reference Manual

2.3.6. Memory and I/O Organization

This section explains hardware implementation details of the Nios® V/m processor memory and I/O organization. The discussion covers both general concepts true for all Nios® V/m processor systems, as well as features that might varies from system to system.

Nios® V/m processor systems are configurable. As a result, the memory and I/O organization varies from system to system. A Nios® V/m processor core uses one or more of the following to provide memory and I/O access:

  • Instruction manager port: An Arm* Advanced Microcontroller Bus Architecture ( AMBA* ) 4 AXI Memory-Mapped manager port that connects to instruction memory via system interconnect fabric.
  • Data manager port: An AMBA* 4 AXI Memory-Mapped manager port that connects to data memory and peripherals via the system interconnect fabric.

Nios® V/m Processor Core Memory Mapped I/O Access: Both data memory and peripherals are mapped into the address space of the data manager port. Nios® V/m processor core uses little-endian byte ordering. Words and halfwords are stored in memory with the more-significant bytes at higher addresses. The Nios® V/m processor core does not specify anything about the existence of memory and peripherals. The quantity, type, and connection of memory and peripherals are system dependent.

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