Cross-point Array

	NAND
Terabytes per Wafer	7.9TB	22.5TB
Technology Node	17nm	17nm
Chip Density	256Gb	1.024Tb
Die size	207	274
MLC	3-bit	2-bit
Gross die per wafer	290	219
Net die per wafer	247	175

 

CMOx Cross-point Memory™ is comprised of a 4-layer memory array and peripheral control logic located underneath the memory. Throughout history semiconductors have been limited to two dimensions. The vertical dimension is starting to be used by stacking semiconductor chips in a package. Through-silicon-vias (TSVs) are a stepping stone to realizing the promise of 3-dimensional technologies. However, chip stacking and TSVs do not change the economics of wafer manufacturing. CMOx Cross-point Memory™ moves beyond these current solutions to provide extremely dense memory chips by fabrication of 4 layers – changing the economics inside the fab.

In reading, programming and erasing CMOx Cross-Point Memory™, current flows vertically from the underlying peripheral control logic and then along the selected column and row cross-bar wires to each cell. This cross-point architecture has long been realized to be the most efficient memory layout. Each cell in a given column or row is exposed to some of the read, program or erase current. This current potentially could disturb the state of any number of the exposed memory cells. Excessive disturb can make the memory unreliable.

Our solution to this problem is a combination of engineering of the CMOx™ memory cell and patented design algorithms and circuitry. The CMOx™ memory cell behavior scales non-linearly with voltage – meaning that small applied voltages cause little disturb on our switching mechanism. There is a threshold amount of voltage that must be applied to a CMOx™ memory cell in order for switching to occur. We also have optimized our crossbar reading, programming and erasing circuitry and algorithms to minimize and control the disturbance of unselected cells.

Through clever design and device engineering, we have achieved selectibility without a non-ohmic device or metal insulator metal. Please read our whitepaper on CMOx Cross-point Memory™ by clicking this link.

View this animation to see how our memory works.