ST B-M2MEM-PACK1 M.2 serial memory pack

Overview

The ST B-M2MEM-PACK1 is a family of M.2 serial memory add-on boards for Nucleo-144 development boards that expose the ST M.2 Key A serial memory connector.

In Zephyr, each populated memory module is modeled as a separate shield variant. All variants share a common identification EEPROM on the M.2 I2C bus and expose one serial NOR flash device on the M.2 XSPI bus.

Supported variants

Shield

Module

Serial NOR

Bus mode

Capacity

IO rail

b_m2mem_pack1_mb1927_33ba

MB1927-33BA

MX25LM51245GXDI00

Octal STR

512 Mbit

3.3 V

b_m2mem_pack1_mb1927_18ba

MB1927-18BA

MX25UW25645GXDI00

Octal STR

256 Mbit

1.8 V

b_m2mem_pack1_mb1928_33la

MB1928-33LA

IS25LP032DJNLE-TR

Quad STR

32 Mbit

3.3 V

b_m2mem_pack1_mb1928_33lb

MB1928-33LB

W25Q16JVSNIQ

Quad STR

16 Mbit

3.3 V

Requirements

This shield family can be used with any board that provides the ST M.2 serial memory connector and exports the board-side Devicetree labels used by the shields:

  • m2mem_i2c for the identification EEPROM bus

  • m2mem_xspi for the serial NOR interface

  • m2mem_ldo_en for module power-cycle/reset control

Host boards providing this connector can be found by filtering the board catalog for the st,m2-memory-connector hardware feature.

Programming

Select the wanted shield variant when invoking west build. For example:

west build -b nucleo_u3c5zi_q --shield b_m2mem_pack1_mb1928_33lb samples/basic/blinky

To build one of the other modules, replace the shield name with one of:

  • b_m2mem_pack1_mb1927_33ba

  • b_m2mem_pack1_mb1927_18ba

  • b_m2mem_pack1_mb1928_33la

  • b_m2mem_pack1_mb1928_33lb

Regardless of the selected variant, the shield exposes its serial NOR device under the stable m2mem_flash Devicetree label, so an application or sample can target it consistently (for example through a flash0 alias). The device can be explored with the Flash shell sample. The common identification EEPROM is described in Devicetree and can be accessed by applications through the EEPROM driver API.

References

ST documentation for the pack and connector includes:

  • B-M2MEM-PACK1 data brief

  • UM3611 [1], M.2 serial memory pack for Nucleo-144 boards

  • TN1618 [2], M.2 serial memory interface specification