METHOD FOR BIASING AN EMBEDDED SOURCE PLANE OF A NON-VOLATILE MEMORY HAVING VERTICAL SELECT GATES

摘要

A method controls a memory that includes twin memory cells formed in a semiconductor substrate. Each memory cell includes a floating-gate transistor including a state control gate, in series with a select transistor that includes a vertical select control gate, common to the twin memory cells, and a source connected to an embedded source line, common to the memory cells. The drains of the floating-gate transistors of the twin memory cells are connected to a same bit line. The method includes controlling a memory cell so as to turn it on to couple the source line to a bit line coupled to the ground, during a step of programming or reading another memory cell.

主权项

1. A method comprising:
controlling a non-volatile memory on a semiconductor substrate, the memory including:
bit lines,control gate lines,a source line formed deep down in the substrate, andpairs of twin memory cells, each including a first memory cell that includes a first floating-gate transistor having a control gate coupled to a first one of the control gate lines, a first conduction terminal coupled to a first one of the bit lines and a second conduction terminal coupled to the source line through a first select transistor having an embedded vertical select control gate, coupled to the word line, and a second memory cell that includes a second floating-gate transistor having a control gate coupled to a second one of the control gate lines, a first conduction terminal coupled to the first bit line and a second conduction terminal coupled to the source line through a second select transistor sharing with the first select transistor the select control gate, wherein the controlling includes: turning on a first selected memory cell of one of the pairs of memory cells, thereby electrically coupling the source line to a line coupled to ground, programming or reading a second selected memory cell of the pairs of memory cells while the first selected memory cell electrically couples the source line to the line coupled to ground.