Memory Type Range Register

What Does Memory Type Range Register Mean?

A memory type range register (MTRR) controls the caching of CPU access to memory. These types of control registers direct the general behavior of the central processing unit.


Techopedia Explains Memory Type Range Register

Memory type range registers can accommodate different types of access to a range of memory such as uncached, write-through, write-combining and write-back. These methods determine how write tasks get to the cache. MTRRs can designate different parts of an address space for different uses. Newer methods use page attribute tables instead of registers (or along with registers) to handle these types of constraints. Pros may look at loads from cacheable or uncacheable memory to determine how accesses are treated by a system that uses memory type range registers.


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Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…