NXP Semiconductors
UM12036
MCX-N9XX-EVK Board User Manual
2.5 Flash memory interface
The target MCU (MCX N94X) features one Flexible Serial Peripheral Interface (FlexSPI) controller, which can
support an external memory.
On the MCX-N9XX-EVK board, one Quad SPI memory is provided. The flash memory VCC (VDD_FLASH) is
supplied by the P1V8 rail through the JP15 jumper. For JP15 jumper details, see Section 1.6.
Table 15 provides the detail of the Quad SPI flash memory on the board.
Part
identifier
Manufacturer and part name Description
U55 Winbond W25Q64JWTBJQ It is a 1.8 V 64-Mbit (8 MB) serial flash memory with dual and quad SPI,
which is intended for demonstrating FlexSPI boot applications, and
general FlexSPI operation.
For main features, refer to device data sheet.
Table 15. Quad SPI flash memory
Figure 18 shows the flash memory circuit diagram.
Figure 18. FlexSPI circuit diagram
The FlexSPI data and clock signals for the flash memory interface are available on Port P3[1:0] and P3[15:6]
pins.
The MCX N94X FlexSPI controller can connect either to an onboard QSPI flash memory (U55) or to an external
flash memory connected through the Flash daughter card connector (J9). The recommended connector for the
flash daughter card connector is the Samtec QSE-014-01-F-D-DP-A.
Some of the FlexSPI signals are also multiplexed with the SAI signals for the M.2 connector. Zero-ohm onboard
resistors are used to allow the selection of signals either for the QSPI flash memory or for the other connectors
(flash data card connector or SAI interface of the M.2 connector). By default, signals for the QSPI flash memory
are selected.
Onboard zero ohm resistors are used to connect or disconnect the flash interface lines from the onboard QSPI
flash memory chip and connect to the flash data card connector or SAI interface of the M.2 connector.
Figure 19 displays the resistors that make these connections.
UM12036 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved.
User manual Rev. 1 — 20 January 2024
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