Operational mode control in serial-connected memory based on identifier
View Patent ↗Applying an adapted block isolation method to serial-connected memory components may mitigate the effects of leakage current in serial-connected non-volatile memory devices. Responsive to determining that a given memory component is not an intended destination of a command, a plurality of core components of the given memory component may be placed in a low power consumption mode, while maintaining input/output components in an active operational mode. Conveniently, aspects of the disclosed system reduce off current without adding many logic blocks into the memory devices.
1. A serial-connected memory system comprising:
a serial-connected memory component including:
a plurality of input components;
a plurality of output components;
a plurality of core components;
a control circuit adapted to, responsive to receiving a predetermined signal, place said plurality of core components into a low power consumption operational mode, while leaving said plurality of input components and said plurality of output components in an active operational mode; and
a comparator adapted to generate said predetermined signal responsive to determining that an identification value associated with said memory component does not match an identification value decoded from a memory component identifier present in a received command packet.
2. The serial-connected memory system of claim 1 wherein said control circuit produces a core drain supply voltage.
3. The serial-connected memory system of claim 2 wherein said core drain supply voltage is associated with:
a first drain supply voltage level corresponding to a core active operational mode; and
a second drain supply voltage level, wherein a magnitude of said second drain supply voltage level is lesser than a magnitude of said first drain supply voltage level, said second drain supply voltage level corresponding to said low power consumption operational mode; and
wherein, responsive to said predetermined signal, said control circuit is adapted to reduce said core drain supply voltage from said first drain supply voltage level to said second drain supply voltage level.
4. The serial-connected memory system of claim 1 wherein said control circuit produces a core source supply voltage.
5. The serial-connected memory system of claim 4 wherein said core source supply voltage is associated with:
a first source supply voltage level corresponding to a core active operational mode; and
a second source supply voltage level, wherein a magnitude of said second source supply voltage level is greater than a magnitude of said first source supply voltage level, said second source supply voltage level corresponding to said low power consumption operational mode; and
wherein, responsive to said predetermined signal, said control circuit is adapted to increase said core source supply voltage from said first source supply voltage level to said second source supply voltage level.
6. The serial-connected memory system of claim 1 wherein said control circuit is adapted to reverse-bias said plurality of core components.
7. The serial-connected memory system of claim 6 wherein said control circuit is adapted to reverse-bias said plurality of core components according to a gate-source reverse-biasing scheme.
8. The serial-connected memory system of claim 7 wherein said control circuit is adapted to employ a gate voltage control with a fixed source voltage category of said gate-source reverse-biasing scheme.
9. A method of managing an operational mode of memory component in a serial-connected memory system, said method comprising:
receiving a command, wherein said command includes a memory component identifier;
decoding said memory component identifier to obtain a command identification value;
obtaining a stored identification value associated with said memory component;
determining that said stored identification value does not match said command identification value; and
responsive to said determining, placing a plurality of core components of said memory component in a low power consumption mode.
10. The method of claim 9 wherein said placing said plurality of core components of said memory component in a low power consumption mode comprises reducing a core drain supply voltage from a first drain supply voltage level to a second drain supply voltage level.
11. The method of claim 10 wherein said reducing acts to reverse-bias a subset of said plurality of core components.
12. The method of claim 11 wherein said reverse-bias is implemented according to a gate-source reverse-biasing scheme.
13. The method of claim 12 wherein said reverse-bias employs a gate voltage control with a fixed source voltage category of said gate-source reverse-biasing scheme.
14. The method of claim 9 wherein said placing said plurality of core components of said memory component in a low power consumption mode comprises increasing a core source supply voltage from a first source supply voltage level to a second source supply voltage level.
15. The method of claim 14 wherein said increasing acts to reverse-bias a subset of said plurality of core components.
16. The method of claim 15 wherein said reverse-bias is implemented according to a gate-source reverse-biasing scheme.
17. The method of claim 16 wherein said reverse-bias employs a gate voltage control with a fixed source voltage category of said gate-source reverse-biasing scheme.