NXP Semiconductors
LPCXpresso55S36UM
LPCXpresso55S36 Development Board User Manual
2.10 Octal flash memory
The target MCU has a flexible SPI (FlexSPI) host controller, which supports Single/Dual/
Quad/Octal mode data transfer (1/2/4/8 bidirectional data lines). The LPCXpresso55S36
board supports communication with the FlexSPI host controller through an octal flash
memory. The board also supports populating a flash connector, which can be used to
connect an external flash memory to be used as an alternative to the onboard octal flash
memory.
The routing of signals between the target MCU and octal flash memory (or external
flash connector) is controlled through various configuration resistors. The configuration
resistors of the octal flash memory are populated, allowing it to communicate to the target
MCU. The external flash connector and its configuration resistors are not populated on
the board.
The octal flash memory and the supported external flash connector are described in the
table below.
Part identifier Manufacturing part number Description
U29 MX25UM51345GXDI00 24-pin ball grid array (BGA), 512 Mbit octal serial NOR flash
memory.
The footprint also supports the following part numbers:
• S26KS256SDPBHV02
• S27KS0641DPBHI023
• APS6408L-OBM-BA (same pinout as S27KS0641DPBHI023)
J45 QSE-014-01-F-D-DP-A 2x14 pin header for connecting an external flash memory
Table 19. Octal flash memory and external flash connector
The default configuration for the LPCXpresso55S36 board uses a 3.3 V supply rail for
the target MCU. However, the octal flash memory connected on the board is not a 3.3
V device. Therefore, by default, the octal flash memory is disconnected from the target
MCU signals to protect it from any damage.
To use the flash memory, change the settings of the jumpers listed in the table below
from default settings to octal flash settings. This selects the 1.9 V supply rail for the target
MCU and the flash memory, and connects the FlexSPI signals to the flash memory. If
you need to change the supply rail back to 3.3 V, then ensure to change the octal flash
jumpers back to the default settings to avoid damaging the flash.
Jumper Octal flash signal at jumper Default jumper setting Jumper setting for octal flash
signal
JP1 VCC_3V3_1V9 1-2 shorted (VCC_3V3) 2-3 shorted (VCC_1V9)
JP56 VCC_FLASH 2-3 shorted (VCC_1V9) 2-3 shorted (VCC_1V9)
JP63 RST_FLASH Open Shorted
JP41 FLEXSPI0_D3/P0_2 2-3 shorted 1-2 shorted
JP42 FLEXSPI0_D0/P0_6 2-3 shorted 1-2 shorted
JP43 FLEXSPI0_DQS/P0_25 2-3 shorted 1-2 shorted
JP44 FLEXSPI0_D2/P0_3 2-3 shorted 1-2 shorted
JP45 FLEXSPI0_SS0_N/P0_21 2-3 shorted 1-2 shorted
JP64 FLEXSPI0_D7/P1_29 2-3 shorted 1-2 shorted
JP65 FLEXSPI0_D6/P1_27 2-3 shorted 1-2 shorted
JP66 FLEXSPI0_D4/P1_16 Open Shorted
JP67 FLEXSPI0_D5/P1_15 Open Shorted
Table 20. Octal flash specific jumpers
LPCXpresso55S36UM All information provided in this document is subject to legal disclaimers. © NXP B.V. 2022. All rights reserved.
User manual Rev. 2 — 5 September 2022
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