On-die termination control without a dedicated pin in a multi-rank system
AssigneeIntel Corporation
InventorsKuljit S Bains, Nadav Bonen
Life of this patent
Estimating the term…
Abstract
A memory subsystem includes a multi-device package including multiple memory devices organized as multiple ranks of memory. A control unit for the memory subsystem sends a memory access command concurrently to some or all of the ranks of memory, and triggers some of all of the memory ranks that receive the memory access command to change on-die termination (ODT) settings. One of the ranks is selected to execute the memory access command, and executes the command while all ranks triggered to change the ODT setting have the changed ODT setting.
Claims19
A method for selectively applying on-die termination, comprising:
- sending write command concurrently to multiple ranks of memory devices for a write operation in a multi-rank memory, the write command directed to a target rank of memory devices to execute the command, including sending multiple sequential commands to generate the write operation;
- triggering, without an ODT control pin, target memory devices of the target rank to turn on on-die termination (ODT) for the write operation, including sending a first command indicating the write operation and a second command with a column address selection for the write operation, where the sequence of the first and second commands is to indicate an ODT setting to the ranks;
- and
- selecting the target rank to execute the write operation.
A memory controller device comprising:
- hardware connectors to couple to a multi-device package having multiple dynamic random access memory (DRAM) devices organized as a plurality of ranks;
- and
- logic to
- send a write command concurrently to multiple ranks of DRAM devices for a write operation, the write command directed to a target rank of DRAM devices to execute the command, including to send multiple sequential commands to generate the write operation;
- trigger, without an ODT control pin, target DRAM devices of the target rank to turn on on-die termination (ODT) for the write operation, including sending a first command indicating the write operation and a second command with a column address selection for the write operation, where the sequence of the first and second commands is to indicate an ODT setting to the ranks;
- and
- select the target rank to execute the write command.
An electronic device with a memory subsystem, comprising:
- a multi-device package having multiple dynamic random access memory (DRAM) devices organized as a plurality of ranks;
- and
- a memory controller including hardware connectors to couple to the multi-device package, and logic to
- send a write command concurrently to multiple ranks of DRAM devices for a write operation, the write command directed to a target rank of DRAM devices to execute the command, including to send multiple sequential commands to generate the write operation;
- trigger, without an ODT control pin, target DRAM devices of the target rank to turn on on-die termination (ODT) for the write operation, including sending a first command indicating the write operation and a second command with a column address selection for the write operation, where the sequence of the first and second commands is to indicate an ODT setting to the ranks;
- and
- select the target rank to execute the write command;
- and
- a touchscreen display coupled to generate a display based on data accessed from the DRAM devices.
Dependencies are inferred from the claim text.