Chapter 7
External memory
The board provides various memory options.
7.1 Octal/Quad flash
The board supports a Macronix Octal flash MX25UM51345GXDI00 by default, but the footprint shall accommodate a 1.8 V ISSI
Quad SPI NOR SDR/DDR flash IS25WP064AJBLE as optional on FlexSPI0.
shows the hardware modifications needed to use the Octal or Quad flash. Use the schematic for label referral.
Table 6. Octal/Quad SPI hardware modifications
Flash
Populated
DNP
OctalSPI flash
(MX25UM51345GXDI00)
A, B, C, D, E1, E2, F, G, H, M, Q,
S (default)
J, K, L, N, P, T, V1 (default)
QuadSPI flash
(IS25WP064AJBLE)
N, P, Q, S, V1
T, A, C, E1, F, L **
Base on OSPI table, and DNP priority is higher than Populated. If DNP and Populated coexist, choose DNP.
7.2 pSRAM
An APM APS6408L‐OBx Octal DDR pSRAM memory with compatible footprint is supported on FlexSPI1.
7.3 SD card
A full size SD card slot (J32) in order to accommodate memory SD cards and SDIO Wi-Fi cards. A 4-bit SDIO interface should be
used for this socket on first SDIO instance.
Software drivers and related examples for the SD card are provided as part of the MCUXpresso SDK.
Table 7. SD card connections
SDIO interface signals
Circuit reference
RT595 port
Clock (CLK)
SD0_CLK
PIO1_30
Command (CMD)
SD0_CMD
PIO1_31
D0
SD0_D0
PIO2_0
D1
SD0_D1
PIO2_1
D2
SD0_D2
PIO2_2
D3
SD0_D3
PIO2_3
Card Detect (CD)
SD0_CARD_DET_N
PIO2_9
Power Enable (WP)
SD0_WR_PRT_DS
PIO2_4
NXP Semiconductors
MIMXRT595 EVK Board Hardware User's Guide, Rev. 0, 02/2021
User's Guide
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