Composition of MRAM cache

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Magnetoresistive random access memory (MRAM) It's a new type of memory , Its advantages include fast reading speed, high integration and non-volatile . At present, a lot of research is mainly devoted to the research of MRAM Memory is used in computer storage system .MRAM Because it has many advantages , There is a substitution for SRAM and DRAM Potential . use MTJ Storage unit built MRAM Memory can be used as a cache .
 
Cache can be used with SRAM Almost the same way to form .MRAM And SRAM Having a similar circuit structure ( See the picture 1).
 
They all select the target operating unit by the word line , Data is transmitted by bit lines .SRAM Two different bit lines are connected to each cell , and MRAM There's only one bit line , You can simply think of the combination of bit lines and source lines as alternatives . Because it is based on sram chip The readout amplifier can't be used directly in MRAM Memory , so MRAM Need a reference signal , Usually by a fake MRAM Unit provides , The area is negligible .
 

 
 
chart 1MRAM The equivalent circuit structure of the unit (1T1J)

 
So a large MRAM The array is divided into several small arrays . The small array can adopt the traditional cache structure , from H-tree Connect , The number and size of rows and columns can be used CACTI Tools to optimize .