Periodic training for unmatched signal receiver
I/O parameters are adjusted based on a number of errors detected in a received training signal. A controller device sends the training signal while a memory device is in a training mode. The memory device samples the training signal and the system causes an adjustment to at least one I/O parameter based on a detected number of errors. Either the controller or the memory device can perform the error detection, depending on the configuration of the system. Either an I/O parameter of the controller or an I/O parameter of the memory device can be adjusted, depending on the configuration of the system.
1. A method comprising:
entering, by a memory device, a training mode of the memory device;
receiving a training signal from a controller while in the training mode, the training signal including a data stream;
sampling the data stream of the training signal with sampling circuitry;
tracking, by the memory device, a number of data errors in the sampling of the data stream of the training signal; and
causing an adjustment to at least one input/output (I/O) parameter based on the number of data errors.
2. The method of claim 1 , wherein entering the training mode comprises entering the training mode during a refresh mode of the memory device.
3. The method of claim 1 , wherein receiving the training signal comprises:
receiving the training signal as a write command; and
discarding the training signal instead of writing it to a memory array of the memory device.
4. The method of claim 1 , wherein tracking the number of errors comprises:
counting with a counter a number of errors that occur over a sequence of training signals.
5. The method of claim 3 , wherein causing the adjustment comprises:
sending the number of errors to the controller to cause the controller to determine the at least one I/O parameter to adjust.
6. The method of claim 1 , wherein causing the adjustment comprises:
causing the adjustment to a receive I/O parameter of the memory device.
7. The method of claim 1 , wherein causing the adjustment comprises:
causing the adjustment to a transmit I/O parameter of the controller.
8. The method of claim 1 , wherein causing the adjustment further comprises:
computing a search function to determine the at least one I/O parameter to adjust.
9. A memory device comprising:
a state controller to cause the memory device to enter a training mode of the memory device;
a hardware contact to interface with a controller device, to receive a training signal from the controller while in the training mode, the training signal including a data stream;
receiver hardware to sample the data stream of the training signal and track a number of data errors in the sampling of the data stream of the training signal; and
logic to cause an adjustment to at least one input/output (I/O) parameter based on the number of data errors.
10. The memory device of claim 9 , wherein the state controller is to cause the memory device to enter the training mode during a refresh mode of the memory device.
11. The memory device of claim 9 , wherein the receiver hardware is to discard the training signal instead of writing it to a memory array of the memory device.
12. The memory device of claim 9 , further comprising:
a counter to count a number of errors that occur over a sequence of training signals.
13. The memory device of claim 9 , wherein the logic is to cause an adjustment to at least one I/O parameter of a transmitter of the controller.
14. The memory device of claim 9 , wherein the logic further comprises:
search function logic to determine the at least one I/O parameter to adjust.
15. A method comprising:
sending a training signal as a write command to a memory device, where the memory device writes the training signal to a register but not to a memory array of the memory device, the training signal including a plurality of data values;
reading the training signal from the register;
checking the read training signal for errors in the plurality of data values; and
causing an adjustment to an input/output (I/O) parameter of the memory device based on a number of errors in the plurality of data errors.
16. The method of claim 15 , wherein causing the adjustment comprises:
causing the adjustment to a transmit I/O parameter of the controller.
17. The method of claim 15 , wherein causing the adjustment further comprises:
computing a search function to determine the at least one I/O parameter to adjust.
18. The method of claim 15 , further comprising:
sending a command to cause the memory device to enter a training state while in the refresh state.
19. A controller device comprising:
a hardware contact to interface with a memory device, the controller device, via the hardware contact, to send a training signal as a write command to the memory device in a refresh state, the training signal including a plurality of data values, where the memory device is to write the training signal including the plurality of data values to a register but not to a memory array of the memory device; and
read the training signal including the plurality of data values from the register; and
logic to check the read training signal for errors in the plurality of data values and cause an adjustment to at least one input/output (I/O) parameter of the memory device based on a number of errors in the plurality of data values.
20. The controller device of claim 19 , wherein the logic is to cause an adjustment to at least one I/O parameter of the controller.