Controlling on-die termination in a nonvolatile memory
A memory controller transmits a plurality of control values to a non-volatile memory device together with one or more programming commands. The plurality of control values include (i) a first control value that specifies a first termination resistance to be applied to an I/O node of the non-volatile memory device during an interval in which a first data signal transmitted on a bidirectional signaling line coupled to the I/O node is to be received within the non-volatile memory device and (ii) a second control value that specifies a second termination resistance to be applied to the I/O node during an interval in which a second data signal is transmitted on the bidirectional signaling line by another non-volatile memory device.
1. A method of controlling a non-volatile memory device, the method comprising:
transmitting one or more commands to a first non-volatile memory device that instruct the first non-volatile memory device to store a plurality of control values within one or more programmable registers of the first non-volatile memory device;
transmitting the plurality of control values to the first non-volatile memory device, including transmitting (i) a first control value that specifies a first termination resistance to be applied to an input/output (I/O) node of the first non-volatile memory device during an interval in which a first data signal transmitted on a bidirectional signaling line coupled to the I/O node is to be received within the first non-volatile memory device via the I/O node, and (ii) a second control value that specifies a second termination resistance to be applied to the I/O node during an interval in which a second data signal is transmitted on the bidirectional signaling line by a second non-volatile memory device.
2. The method of claim 1 further comprising transmitting the first data signal to the first non-volatile memory device together with a command indicating that a data value represented by the first data signal is to be stored within a non-volatile memory array of the first non-volatile memory device.
3. The method of claim 2 wherein transmitting the one or more commands, plurality of control values and first data signal comprises transmitting the one or more commands, plurality of control values and first data signal via signaling circuitry within an integrated circuit controller device coupled to the first and second non-volatile memory devices via a plurality of signaling lines that include the bidirectional signaling line.
4. The method of claim 2 further comprising transmitting an address value to the first non-volatile memory device in association with the first data signal, the address value indicating a storage location within the non-volatile memory array at which the data value represented by the first data signal is to be stored, and wherein the address value and the command indicating that the data value is to be stored within the non-volatile memory array are each transmitted at least in part via the bidirectional signaling line to be received within the first non-volatile memory device via the first I/O node.
5. The method of claim 2 wherein transmitting the command indicating that the data value is to be stored within the non-volatile memory array comprises asserting a write-enable signal.
6. The method of claim 1 further comprising transmitting to the second non-volatile memory device a read command indicating that a data value stored within a non-volatile memory array of the second non-volatile memory device is to be retrieved and transmitted by the non-volatile memory device via the bidirectional signaling line as the second data signal.
7. The method of claim 1 further comprising asserting a chip-select signal to enable the first non-volatile memory device to receive the one or more commands.
8. The method of claim 1 wherein transmitting the one or more commands to the first non-volatile memory device comprises transmitting one or more constituent bits of the one or more commands at least in part via the bidirectional signaling line to be received within the first non-volatile memory device via the I/O node.
9. The method of claim 1 further comprising transmitting to the first non-volatile memory device (i) an address value that enables the first non-volatile memory device to be distinguished from one or more other non-volatile memory devices, and (ii) an address-programming command that instructs the first non-volatile memory device to store the to the address value within the one or more programmable registers.
10. An integrated circuit device comprising:
a signaling interface; and
controller logic to transmit to at least a first non-volatile memory device via the signaling interface:
one or more commands that instruct the first non-volatile memory device to store a plurality of control values within one or more programmable registers of the first non-volatile memory device;
a first control value that constitutes one of the plurality of control values and that specifies a first termination resistance to be applied to an input/output (I/O) node of the first non-volatile memory device during an interval in which a first data signal transmitted on a bidirectional signaling line coupled to the I/O node is to be received within the first non-volatile memory device via the I/O node; and
a second control value that constitutes one of the plurality of control values and that specifies a second termination resistance to be applied to the I/O node during an interval in which a second data signal is transmitted on the bidirectional signaling line by a second non-volatile memory device.
11. The integrated circuit device of claim 10 wherein the controller logic to transmit the first and second control values and the one or more commands is to transmit the one or more commands prior to transmitting the first and second control values.
12. The integrated circuit device of claim 10 wherein the controller logic is additionally to transmit the first data signal to the first non-volatile memory device together with a command indicating that a data value represented by the first data signal is to be stored within a non-volatile memory array of the first non-volatile memory device.
13. The integrated circuit device of claim 12 wherein the controller logic is additionally to transmit an address value to the first non-volatile memory device in association with the first data signal, the address value indicating a storage location within the non-volatile memory array at which the data value represented by the first data signal is to be stored, and wherein the controller logic transmits the address value and the command indicating that the data value is to be stored within the non-volatile memory array at least in part via the bidirectional signaling line.
14. The integrated circuit device of claim 12 wherein the controller logic to transmit the command indicating that the data value is to be stored within the non-volatile memory array comprises signaling circuitry to assert a write-enable signal.
15. The integrated circuit device of claim 10 wherein the controller logic is additionally to transmit to the second non-volatile memory device a read command indicating that a data value stored within a non-volatile memory array of the second non-volatile memory device is to be retrieved and transmitted by the second non-volatile memory device via the bidirectional signaling line as the second data signal.
16. The integrated circuit device of claim 10 wherein the controller logic is additionally to assert a chip-select signal to enable the first non-volatile memory device to receive the one or more commands.
17. The integrated circuit device of claim 10 wherein the controller logic to transmit the one or more commands to the first non-volatile memory device comprises logic to transmit one or more constituent bits of the one or more commands at least in part via the bidirectional signaling line.
18. The integrated circuit device of claim 10 wherein the controller logic is additionally to transmit to the first non-volatile memory device (i) an address value that enables the first non-volatile memory device to be distinguished from one or more other non-volatile memory devices, and (ii) an address-programming command that instructs the first non-volatile memory device to store the to the address value within the one or more programmable registers.
19. The integrated circuit device of claim 10 wherein the controller logic to transmit the first and second control values to at least the first non-volatile memory device via the signaling interface comprises circuitry to transmit the first and second control values to a flash memory device via the signaling interface.
20. An integrated circuit device comprising:
a signaling interface; and
means for transmitting to at least a first non-volatile memory device via the signaling interface:
one or more commands that instruct the first non-volatile memory device to store a plurality of control values within one or more programmable registers of the first non-volatile memory device;
a first control value that constitutes one of the plurality of control values and that specifies a first termination resistance to be applied to an input/output (I/O) node of the first non-volatile memory device during an interval in which a first data signal transmitted on a bidirectional signaling line coupled to the I/O node is to be received within the first non-volatile memory device via the I/O node; and
a second control value that constitutes one of the plurality of control values and that specifies a second termination resistance to be applied to the I/O node during an interval in which a second data signal is transmitted on the bidirectional signaling line by a second non-volatile memory device.