Hard Processor System Technical Reference Manual: Agilex™ 5 SoCs

ID 814346
Date 4/01/2024
Public
Document Table of Contents

3.5.3.4.3. Translation Table Walks

When an access is requested at an address, the MMU searches for the requested virtual address in the TLBs. If it is not present, then it is a miss and the translation proceeds by looking up the translation table during a translation table walk.

If a L2 TLB miss occurs, the hardware does a translation table walk if the MMU is enabled and the translation using the base register has not been disabled. If the translation table walk is disabled for a particular base register, the core returns a translation fault. If the TLB finds a matching entry, it uses the information in the entry as follows.

The access permission bits determine whether the access is permitted. If the matching entry does not pass the permission checks, the MMU signals a Permission fault.