What is the difference between voltage domain and power domain?
What is the difference between voltage domain and power domain?
Voltage area is nothing but the physical view of a power domain where we assign a physical area on the chip for the logic under a given power domain to sit physically on the chip! Confusing, I know, but read it again and you’d be able to grasp the difference.
What is power domain in UPF?
Hence, the UPF power domain is a collection of instances that are treated as a group for power-management purposes. The interface of a power domain is the union of the upper boundary and the lower boundary of the power domain.
Why are many power domains in a device or SoC?
Power domains were traditionally used to enable or disable power to a region of a system on chip (SoC) but, with the recent updates, they can control the clock rate or amount of power supplied to that region as well. SoCs have become increasingly complex and power-efficient over the years.
What is PM domain in Linux?
Generic power domains are an abstraction on top of Linux kernel power domains. They provide a number of benefits over regular power domains because they support: Domain hierarchies. Adding and removing devices from domains at runtime.
What is UPF in chip design?
The Unified Power Format (UPF) is a published IEEE standard and developed by members of Accellera. It is intended to ease the job of specifying, simulating and verifying IC designs that have a number of power states and power islands.
What is UPF in VLSI?
Unified Power Format (UPF) is the popular name of the Institute of Electrical and Electronics Engineers (IEEE) standard for specifying power intent in power optimization of electronic design automation. The IEEE 1801-2009 release of the standard was based on a donation from the Accellera organization.
What is power state table in UPF?
The power/supply sets state of the power objects are the entry values in the power state table. In UPF 2.0, power state definitions using add_power_state commands are hierarchical in nature. That is, the power state of a system is dependent on power state of its constituent IPs (represented as power domains).
What is power domain in VLSI?
In CPF, a power domain is a collection of gates powered by the same power and ground supply. This definition is based on electrical connection. The terms “voltage island” and “power island” mean exactly the same thing. In UPF 1.0, “power domain” refers to a logical hierarchy in the design.
What is PM QoS?
This interface provides a kernel and user mode interface for registering performance expectations by drivers, subsystems and user space applications on one of the parameters. The per-device PM QoS framework provides the API to manage the per-device latency constraints and PM QoS flags. …
What is runtime PM?
Support for runtime power management (runtime PM) of I/O devices is provided at the power management core (PM core) level by means of: * The power management workqueue pm_wq in which bus types and device drivers can put their PM-related work items. * A set of helper functions defined in drivers/base/power/runtime.
Why is UPF required?
UPF scripts help describe power intent such as: which power rails to be routed to individual blocks, when blocks are expected to be powered up or shut down, how voltage levels should be shifted between two different power domains, and type of measures taken for retention registers and memory cells contents if the …
What UPF contains?
The Unified Power Format was developed within Accellera and the first version published in 2007. It specifies the power intent of an electronic design and includes elements such as power supply definitions, power control requirements, level shifters, isolation and memory retention.
