Coordinating memory operations using memory-device-generated reference signals

A memory system comprising:

• a memory controller to issue a request for a timing indication;
• and
• a memory device coupled to the memory controller, the memory device including:
• a memory core having dynamic random-access memory (DRAM) cells;
• a memory command interface to receive the request for the timing indication from the memory controller;
• an integrated oscillator that oscillates as a frequency that varies with a temperature of the memory device;
• a circuit to generate, based on the integrated oscillator, the requested timing indication that varies with the temperature of the memory device;
• and
• a transmitter to transmit the requested timing indication to the memory controller responsive to the request for the timing indication.

A method of synchronizing a memory device with a memory controller as the memory device is affected by variations in a temperature of the memory device, the method comprising:

• generating a timing reference on the memory device, the timing reference varying with the temperature of the memory device;
• receiving, from the memory controller, a request for a timing indication;
• generating the requested timing indication from the timing reference that varies with the temperature of the memory device;
• and
• transmitting the requested timing indication to the memory controller.