Memory access during memory calibration

摘要

A multi-rank memory system in which calibration operations are performed between a memory controller and one rank of memory while data is transferred between the controller and other ranks of memory. A memory controller performs a calibration operation that calibrates parameters pertaining to transmission of data via a first data bus between the memory controller and a memory device in a first rank of memory. While the controller performs the calibration operation, the controller also transfers data with a memory device in a second rank of memory via a second data bus.

主权项

1. A method of controlling first and second ranks of memory devices, coupled to a memory controller, via data buses that include at least a first data bus and a second data bus both of which are coupled to a first memory device in the first memory rank and a second memory device in the second memory rank, the method comprising:
performing a calibration operation that pertains to transmission of data between the first memory device and the memory controller via the first data bus; and while performing the calibration operation, transferring data, via the second data bus, between the second memory device and the memory controller.