19.1.4.10 SDMMC Memory Configuration Data (Second Word)
Warning: To avoid any
malfunctioning, the user must not write the "DO NOT USE (DNU)" bits.
| Name: | MEM_CFGx[1] |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| DNU | DNU | DNU | DNU | DNU | DNU | DNU | DNU | ||
| Access | |||||||||
| Reset |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| DNU | DNU | DNU | DNU | DNU | DNU | DNU | DNU | ||
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| WPKEY[7:0] | |||||||||
| Access | |||||||||
| Reset | |||||||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| ENABLE | DNU | DNU | DNU | DNU | DNU | DNU | DNU | ||
| Access | |||||||||
| Reset |
Bits 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 – DNU DO NOT USE
Bits 15:8 – WPKEY[7:0] Write Protect Key
| Value | Name | Description |
|---|---|---|
| 0x96 | PASSWD | If any other value is written in this field, all the other bit values are ignored. |
Bit 7 – ENABLE Card Detect Enable
| Value | Description |
|---|---|
| 0 | Card detect disable, the ROM code does not use any card detect pin and directly tries to boot from the memory connected to the SDMMC controller. |
| 1 | Card detect enable, the ROM code checks the level of the card detect pin. If the level is 0, the ROM code tries to boot from the memory connected to the SDMMC controller. If the level is 1, the ROM code skips the SDMMC controller and jumps to the next interface in the boot sequence. |