» Current | 2022 | 2021 | 2020

Linley Newsletter

i.MX8ULP Uses FD-SOI to Cut Power

March 23, 2021

Author: Aakash Jani

NXP has extended its i.MX8 series to serve battery-powered devices by offering the i.MX8ULP and i.MX8ULP-CS, replacing the older i.MX7ULP. The new models upgrade to more modern CPUs including Cortex-A35 and Cortex-M33. They employ Samsung’s 28nm FD-SOI technology to minimize SRAM leakage and overall power consumption. The 8ULP is scheduled to sample in 2Q21 and reach production in 1H22; the 8ULP-CS should follow about six months later.

As with the 7ULP, customers have two CPU-configuration options for the 8ULP. The new design’s application-processor domain supports one or two Cortex-A35 cores with 32KB instruction and data caches. The 64-bit A35 replaces the 7ULP’s ancient 32-bit Cortex-A7. It delivers 40% more performance at the same power, boosting integer IPC by 6% and floating-point IPC by 36%. The A35 integrates a dedicated power-management unit, which reduces power consumption by 7% per core. NXP doubled the L2 cache size to 512KB, further decreasing power by limiting external-memory reads.

In the real-time domain, the 8ULP integrates a single Cortex-M33F with DSP extensions, upgrading the 7ULP’s Cortex-M4. The M33F brings single-precision floating-point support to the real-time domain, enabling medical and industrial applications to run on the low-power processor. For general integer code, it scores 3.86 CoreMarks per megahertz (a proxy for instructions per cycle)—13% better than the M4. The new real-time CPU features 32KB instruction and data caches, which are 4x larger than the 7ULP’s.

Subscribers can view the full article in the Microprocessor Report.

Subscribe to the Microprocessor Report and always get the full story!

Free Newsletter

Linley Newsletter
Analysis of new developments in microprocessors and other semiconductor products


Linley Spring Processor Conference 2022
Registration now open: April 20-21, 2022
Hyatt Regency Hotel, Santa Clara, CA
Linley Fall Processor Conference 2021
Held October 20-21, 2021
Proceedings available
Linley Spring Processor Conference 2021
April 19 - 23, 2021
Proceedings Available
More Events »