Determine link startup sequence (LSS) type using reference clock frequency and attribute
AssigneeWestern Digital Technologies, Inc.
InventorsRotem Sela, Shemmer Choresh
Life of this patent
Estimating the term…
Abstract
The present disclosure generally relates to utilizing the host clock signal frequency to determine whether to operate in the default pulse width modulation (PWM) link startup sequence (LSS), be changed to high speed (HS) LSS by a host device capable of operating in either PWM LSS or HS LSS, or ignore the data storage device attributes of operating in PWM LSS and instead operate according to HS LSS. In so doing, the data storage device is adaptable to work with older generation UFS host devices as well as current and future generation UFS host devices.
Claims16
A data storage device, comprising:
- a memory device;
- and
- a controller coupled to the memory device, the controller configured to:
- set first default link attributes to a first frequency at a first power on, wherein the first default link attributes is a pulse width modulation (PWM) link startup sequence (LSS);
- receive a host reference clock signal from a host device, wherein the host reference clock signal has a second frequency and second default link attributes different from the first default link attributes, wherein the second default link attributes is a high speed (HS) LSS;
- determine that the second frequency is higher than the first frequency;
- ignore the first frequency;
- operate at the second frequency while maintaining the first default link attributes;
- and
- change from the first default link attributes to the second default link attributes at a second power on.
A data storage device, comprising:
- a memory device;
- and
- a controller coupled to the memory device, the controller configured to:
- set default link attributes to a first frequency at a first power on, wherein the default link attributes is a PWM LSS;
- receive a host reference clock signal from a host device, wherein the host reference clock signal has a second frequency and a second link attributes different from the default link attributes;
- receive instructions from the host device to change the link attributes to the second frequency;
- change the default link attributes to the second link attributes;
- operate as the second frequency with the second link attributes at a second power on, based on the change, wherein the second link attributes is a HS LSS.
Dependencies are inferred from the claim text.