Nios® V Embedded Processor Design Handbook

ID 726952
Date 5/13/2024
Document Table of Contents

2.3.5. Tightly Coupled Memory

Tightly coupled memories (TCMs) are implemented using on-chip memory as their low latency makes them well suited to the task. TCMs are memories mapped in the typical address space but have a dedicated interface to the microprocessor and possess the high-performance, low-latency properties of cache memory. TCM also provides a subordinate interface for the external host. The processor and external host have the same permission level to handle the TCM.

Note: When the TCM subordinate port is connected to an external host, it may be displayed with a different base address than the base address assigned in the processor core. Altera recommends to align both addresses to the same value.