December 21st, 2020 — With the growing chip complexity observed in many market segments, in addition to a need for longer battery life, SoC design teams are forced to adopt advanced power management techniques to improve the energy-efficiency of their devices. Recent process nodes offer a high level of SoC integration with RF connectivity, logic MCU, non-volatile memory, AI/ML processor and analog blocks on the same die, so system and power architects now have to deal with:
— Fast wake-up times to ensure instant-on operation from sleep and stand-by modes
— Control of multiple voltages on the same die to supply MCU/logic, RF, analog and SRAM domains
— Fine-grain control of power and clock gating to instantaneously switch-on / switch-off domains
— Increasing number of power modes for maximum flexibility at application-level
— Fast transitions during power mode changes to minimize energy consumption
The conventional approach for PMU design is to use a software-based solution to control the devices involved in power management. Software brings a highly flexible and configurable alternative for PMU implementation, however it requires an always-active CPU to manage the power schemes, with the penalty of hundreds of power-consuming CPU clock cycles and accesses to Flash memory.
Another approach used by design teams with more experience in power management, is to adopt hardware solutions to enable low-latency control of their power devices with decreased power consumption. However, designing full custom logic for power control requires an in-depth expertise in power management and drastically increases the design and verification cycle time. In addition, a full-custom PMU tailored for a given circuit is hardly portable and scalable to another product, even for low or mid-complexity SoC.
The ideal solution would mix the configurability of a software PMU together with the lowest power consumption of a hardware PMU.
Dolphin Design makes this possible with the latest version of MAESTRO, a unique Power Controller RTL IP which is now accompanied by PowerStudio compiler to speed-up the design of a highly scalable power controller that features breakthrough capabilities compared to traditional HW or SW PMU design methodologies.
— Dual operation mode
o CPU-less HW operation mode for low-power and low latency control of power devices
o Flexible SW operation mode with a standard 32-bit APB interface that enables on-the-fly execution of SW-based power sequences
— Embedded sequencer for autonomous control of power mode transitions, including boot-up and wake-up sequences where CPU is off
— Event-based architecture to trigger any power sequence (up to 16 pre-programmed HW events)
— Built-in always-ready 10 MHz oscillator to enable fast wake-up when RTC clocks are shutdown
-Fine-grain control of power devices (regulators, clock generators) with standard p-channel interface, enabling smooth support of both IP from Dolphin Design or 3rd party provider
MAESTRO is now augmented with PowerStudio compiler to enable a faster path from architecture to integration, featuring:
— Power State Table and Power Mode Changes GUI for fast configuration: design in a single day, iterate in a single hour
— MAESTRO gate count & transition time calculator
— Automated generation of MAESTRO RTL configuration
— Automated generation of UPF test-bench for PMU in-context verification
MAESTRO is currently being used to enable multiple customer tape-outs in various silicon technology nodes, including FD-SOI and bulk technologies.
Tags: Dolphin Design