Hardware
12
SPRUII5A – December 2017 – Revised November 2018
Copyright © 2017–2018, Texas Instruments Incorporated
DRA77xP/DRA76xP-ACD CPU EVM Board
3.5.3
EMMC Flash Memory
As a primary non-volatile storage device, the EVM includes 8GBytes of eMMC flash memory. The memory
device is EMMC v4.51 compliant, and connects to MMC2 port of the SoC. The design can supports rates
up to HS-200.
•
EMMC device used: Micron MTFC8GLWDM-3M AIT Z
Booting from the EMMC Flash memory is supported on the EVM. The on-board mux must be to enable
EMMC by setting SW8.p3 to ON. Ensure the correct SoC boot mode is set using the SYS_BOOT switches
(SW3, SW4).
3.5.4
MicroSD Card Cage
For non-volatile storage expansion, the EVM includes a microSD card cage. The cage is connected to
MMC1 port of the SoC. To support higher speed cards that operate at lower voltages, the IO supplies is
changed from 3v3 to 1v8 by setting TPS917 REGEN3 register low. As SD card can be a boot peripheral,
the power is defaulted to ON. No EVM configuration is required for booting as the SD card is enabled by
default. Ensure the correct SoC boot mode is set using the SYS_BOOT switches (SW3, SW4). The SD
card power can be disabled using GPIO4_21 and setting it low. For SoC-specific information regarding
supported card types, densities, and speeds, see the
DRA75xP, DRA74xP, DRA77xP, DRA76xP SoC for
Automotive Infotainment Silicon Revision 1.0
(SPRUI98).
3.5.5
GPMC NOR Flash Memory
A 512M-bit NOR Flash memory (x16) is supported as a non-volatile memory option on the EVM. It is
supported on chip select CS0, and therefore can also be uses as a boot device. Booting from the NOR
flash memory is supported on the EVM. The on-board mux must be to enable the memory by setting
SW6.p2 to ON. Ensure the correct SoC boot mode is set using the SYS_BOOT switches (SW3, SW4).
•
NOR device used: Spansion S29GL512S10TFI010
3.5.6
GPMC NAND Flash Memory
A 4G-bit NAND Flash memory (x16) is supported as a non-volatile memory option on the EVM. It is
supported on chip select CS0, and therefore can also be uses as a boot device. Booting from the NAND
flash memory is supported on the EVM. The on-board mux must be to enable the memory by setting
SW6.p1 to ON. Ensure the correct SoC boot mode is set using the SYS_BOOT switches (SW3, SW4).
•
NAND device used: Micron MT29F4G16BADWP:D
3.6
Boot Modes
The SoC supports a variety of different boot modes, which is determined by the 16-bit “system boot”
setting present on the shared specific I/O balls during power-on sequence. For more details, see
DRA75xP, DRA74xP, DRA77xP, DRA76xP SoC for Automotive Infotainment Silicon Revision 1.0
(SPRUI98). Boot mode selection is accomplished on the EVM by the setting of DIP switches SW3 and
SW4 prior to cycling power.
Note that these SoC resources can be “redeployed” to support alternate interfaces after boot-up by way of
both SoC pin EVM mux settings.