Boot Mode; Features; Boot Mode And Pin Function Setting - Renesas RZ/A Series User Manual

RZ/A1L Group, RZ/A1LU Group, RZ/A1LC Group
3.

Boot Mode

This LSI can be booted from the memory connected to the CS0 space and the serial flash memory.
Note 1. Booting from the NAND flash memory with an SD controller and the NAND flash memory with an MMC
controller are not currently supported.
3.1

Features

• Four boot modes
Boot mode 0: Boots the LSI from the memory (bus width: 16 bits) connected to the CS0 space
Boot mode 1: Boots the LSI from the serial flash memory connected to the SPI multi I/O bus space
Boot mode 2: Boots the LSI from the NAND flash memory with the SD controller*
Boot mode 3: Boots the LSI from the NAND flash memory with the MMC controller*
Note 1. It is possible to boot the LSI from the embedded SD (eSD) defined by the SD specification part 1 eSD
addendum version 2.10 standard.
Note 2. It is possible to boot the LSI from the eMMC device corresponding to the boot operating mode of the JEDEC
standard JESD84 A44 (MMCA 4.4) Standard. (It is not possible to boot the LSI from the MMC card.)
3.2

Boot Mode and Pin Function Setting

This LSI can determine the boot mode using external pins when RES is low. The external pin settings for selecting the
boot mode are shown in Table 3.1.
Table 3.1 External Pin (MD_BOOT1 and MD_BOOT0) Settings and Corresponding Boot Modes
MD_BOOT1 MD_BOOT0
0 0
1 0
0 1
1 1
R01UH0437EJ0600 Rev.6.00
Jan 29, 2021
Boot Mode
Boot Mode 0 (CS0-space 16-bit booting)
Boots the LSI from the memory (bus width: 16 bits) connected to the CS0 space.
Boot Mode 1 (serial flash booting)
Boots the LSI from the serial flash memory connected to the SPI multi I/O bus space.
Boot Mode 2 (eSD booting)
Boots the LSI from the NAND flash memory with the SD controller. The only way of booting
this LSI chip is from channel 0 (P3_0 to P3_5) in this mode.
Boot Mode 3 (eMMC booting)
Boots the LSI from the NAND flash memory with the MMC controller.
3. Boot Mode
1
2
3-1