Accessing data stored in a command/address register device

摘要

A register not connected to a data bus is read by transferring data across an address bus to a device connected to the data bus, from which the data is read by a device connected to the data bus. The register resides in a register device connected via the address bus to a memory device that is connected to both the address bus and the data bus. A host processor triggers the register device to transfer information over the address bus to a register on the memory device. The host processor then reads the information from the register of the memory device.

主权项

1. In a memory subsystem, a method comprising:
logging information about a memory command in a register device coupled to a dynamic random access memory (DRAM) device over an address bus of the memory subsystem, the register device not coupled to a data bus of the memory subsystem; detecting a read trigger for the log information in the register device; and in response to detecting the read trigger, writing the log information to a multipurpose register (MPR) of the DRAM device, the MPR to make the log information accessible to a host processor over the data bus.