SAMA5D27 datasheet(40/55 Pages) MICROCHIP

40 / 55 page

For details of the Boot sequence, refer to the "NVM Bootloader Program Description for MRL C Parts" diagram of the

SAMA5D2 data sheet, document no. DS60001476.

The table below provides the list of external memory types and interfaces that may be used to boot the SAMA5D27

SOM1:

Table 7-1. External Memory Connections

Memory Type

Interface

PIO

Comments

SDCard

SDMMC0

PA0 to PA13

If external SDMMC0 interface is not used, bit

SDMMC_0 in Boot Configuration Word must be

set to 1.

SDMMC1

PA18 to PA22, PA27 to

PA30

If external SDMMC1 Interface is not used, bit

SDMMC_1 in Boot Configuration Word must be

set to 1.

eMMC

SDMMC0

PA0 to PA10, PA13

If external SDMMC0 Interface is not used, bit

SDMMC_0 in Boot Configuration Word must be

set to 1.

SDMMC1

PA18 to PA22, PA27,

PA30

If external SDMMC0 interface is not used, bit

SDMMC_1 in Boot Configuration Word must be

set to 1.

NAND Flash

NFC

PA0 to PA12

Field NFC in Boot Configuration Word must be

set to "01". IOSET2 is selected. (See Notes below)

PA22 to PA31, PB0 to

PB2, PC8

Field NFC in Boot Configuration Word must be

set to "00". IOSET1 is selected. (See Notes below)

QSPI Flash

QSPI0

PA0 to PA5

Field QSPI_0 in Boot Configuration Word must

be set to "00". IOSET1 is selected. (See Notes

below)

PA14 to PA19

Field QSPI_0 in Boot Configuration Word must

be set to "01". IOSET2 is selected. (See Notes

below)

PA22 to PA27

Field QSPI_0 in Boot Configuration Word must

be set to "10". IOSET3 is selected. (See Notes

below)

QSPI1

PB5 to PB10

Need to tie DIS-BOOT pin to GND. Bits QSPI_1 in

Boot Configuration Word must be set to "01".

IOSET2 is selected. (See Notes below)

SPI Flash

SPI0

PA14 to PA17

Bits SPI_0 in Boot Configuration Word must be

set to "00". IOSET1 is selected. (See Notes below)

PA30, PA31, PB0, PB1

Bits SPI_0 in Boot Configuration Word must be

set to "01". IOSET2 is selected. (See Notes below)

SPI1

PA22 to PA25

Bits SPI_1 in Boot Configuration Word must be

set to "01". IOSET2 is selected. (See Notes below)

PC1 to PC4

Bits SPI_1 in Boot Configuration Word must be

set to "00". IOSET1 is selected. (See Notes below)

Note: For these external memory configurations, set the EXT_MEM_BOOT_ENABLE bit to "1" in Boot

Configuration Word.

Note: The Boot Configuration Word allows several customizations of the boot sequence. For details, refer to the

section "Boot Configuration" in the SAMA5D2 Data Sheet, document no. DS60001476.

SAMA5D27 SOM1

Booting Guidelines

Datasheet

DS60001521D-page 40

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