US 2026/0037019 A1 · ENHANCED CHIP SELECT SIGNAL TRAINING

Abstract

In some aspects, a memory device may receive a command to enter a chip select training mode, may perform a chip select training operation for a sampling window using a clock signal with a first frequency and a chip select signal having a pattern of high and low pulses, and may provide results of the training operation for high pulses via a first data in or out (DQ) signal and for low pulses via a second DQ signal. The memory device may receive a command to exit the chip select training mode, may process only certain commands while in the training mode, and may maintain the training results until reset by a host device. The controller may also be configured to alternate sampling on different clock edges and to reduce the frequency of the clock signal prior to exiting the training mode for improved reliability. Numerous other aspects are described.

Claims30

Dependent claims

A memory device, comprising:

a memory;
and
a controller configured to couple to the memory and couple to a host through an interface having a clock signal, a chip select signal, a first data in or out (DQ) signal, and a second DQ signal, wherein the controller is configured to:
receive a first command with a first operation code for a chip select training mode (CSTM) entry, wherein CSTM is enabled in response to the first command;
perform, for a sampling window, a chip select training operation using the clock signal and the chip select signal, wherein the clock signal has a first frequency and the chip select signal has a pattern including high pulses and low pulses,
provide, via the first DQ signal, a first result of the chip select training operation for the high pulses of the chip select signal;
provide, via the second DQ signal, a second result of the chip select training operation for the low pulses of the chip select signal;
and
receive a second command with a second operation code for a chip select training mode exit, wherein CSTM is disabled in response to the second command.

6 more elements

Dependencies are inferred from the claim text.

Enhanced chip select signal training

Life of this patent

Enhanced chip select signal training

Life of this patent

Abstract

Claims30