MTP NVM elements by-passed for programming
View Patent ↗Non-Volatile Memory (NVM) cells include a selection circuit for providing an output based on selecting between an input data signal and an output of a Multiple Time Programmable (MTP) NVM element. The input data signal may be latched by a latch circuit such as a flip-flop first. The selector circuit's output is used to confirm the programming values for the MTP NVM element such that the element can be programmed correctly without losing time by reading the programmed MTP NVM element or reprogramming a misprogrammed element.
1. A memory circuit for use with an operational circuit, comprising:
an input data node configured to receive successively a plurality of input data signals;
a Multiple Time Programmable (MTP) Non-Volatile Memory (NVM) element configured to be programmed a plurality of times, each time according to the signal present on the node at the time, and to further provide an output signal according to how it is programmed; and
a selector circuit configured to provide a start up value signal to the operational circuit by selecting one of the latest signal present on the node, and the output signal of the MTP NVM element.
2. The circuit of claim 1 , further comprising:
a latch configured to receive the input data signals and present them on the node.
3. The circuit of claim 2 , wherein
the latch includes one of a D type flip-flop, an S-R type flip-flop, a J-K type flip-flop, and a toggle type flip-flop.
4. The circuit of claim 1 , wherein
the selector circuit is a multiplexer.
5. The circuit of claim 1 , wherein
the MTP NVM element is configured to be programmed responsive to a programming enable signal.
6. The circuit of claim 1 , wherein
the selector circuit is configured to perform the selection responsive to a data select signal.
7. The circuit of claim 1 , wherein
a Power On Reset (POR) circuit is adapted to generate a POR signal after being powered down and powered up again, and
the start up value signal is provided responsive to the POR signal.
8. The circuit of claim 1 , further comprising:
a bit program confirm circuit adapted to output a confirmation signal indicative of whether the output signal of the programmed MTP NVM element is in accordance with the signal present on the node.
9. The circuit of claim 8 , wherein
the bit program confirm circuit is a logical circuit.
10. The circuit of claim 8 , wherein
the bit program confirm circuit is an XNOR gate.
11. A memory array for use with an operational circuit, comprising:
a plurality of input data nodes;
a plurality of Multiple Time Programmable (MTP) Non-Volatile Memory (NVM) elements, each corresponding respectively to one of the nodes, each configured to be programmed a plurality of times, each time according to a signal present on its corresponding node, and to further provide an output signal according to how it is programmed; and
a plurality of selector circuits each corresponding respectively to one of the nodes and its corresponding MTP NVM element, each configured to provide a start up value signal to the operational circuit by selecting one of a signal present on its corresponding node, and the output signal of its corresponding MTP NVM element.
12. The array of claim 11 , further comprising:
a plurality of latches each corresponding respectively to one of the nodes, each latch configured to receive successively a plurality of input data signals and present them on its corresponding node.
13. The circuit of claim 12 , wherein
one of the latches includes one of a D type flip-flop, an S-R type flip-flop, a J-K type flip-flop, and a toggle type flip-flop.
14. The array of claim 11 , wherein
a first one of the latches is arranged serially with a second one of the latches, and
the second latch is adapted to latch an input data signal latched in the first latch.
15. The array of claim 11 , wherein
the MTP NVM elements are configured to be programmed responsive to a programming enable signal.
16. The array of claim 11 , wherein
the selector circuits are configured to perform the selection responsive to a data select signal.
17. The array of claim 11 , wherein
a Power On Reset (POR) circuit is adapted to generate a POR signal after being powered down and powered up again, and
the start up value signals are provided responsive to the POR signal.
18. The array of claim 11 , further comprising:
a plurality of a bit program confirm circuits, each adapted to output a confirmation signal indicative of whether the output signal of its corresponding programmed MTP NVM element is in accordance with a signal present on its corresponding node.
19. The array of claim 18 , wherein
the bit program confirm circuits are logical circuits.
20. The array of claim 18 , wherein
the bit program confirm circuits are XNOR gates.
21. The array of claim 18 , wherein
a first one of the bit program confirm circuits is adapted to receive the confirmation signal of a second one of the bit program confirm circuits; and
further comprising daisy chaining circuitry such that the confirmation signal of the first bit program confirm circuit also indicates that the confirmation signal of the second bit program confirm circuit indicates that the output signal of the programmed MTP NVM element corresponding to the second confirm circuit is in accordance with the latest signal latched in the latch corresponding to the second confirm circuit.