2.9.1.7.8 SD Card/e.MMC Memory Boot Configuration (First Word)
This word is the first word used to add an external SD card/e.MMC Flash memory in the boot sequence. It allows to define the interface (type and instance) and the IOSET.
Warning: To avoid any
malfunctioning, the user must not write the "DO NOT USE (DNU)" bits.
| Name: | MEM_CFGx[0] |
| 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 | |
| DNU | DNU | DNU | DNU | IFACE_TYPE[3:0] | |||||
| Access | |||||||||
| Reset | |||||||||
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| INSTANCE_ID[3:0] | IFACE_IOSET[3:0] | ||||||||
| Access | |||||||||
| Reset | |||||||||
Bits 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31 – DNU DO NOT USE
Bits 11:8 – IFACE_TYPE[3:0] Boot memory interface type
| Value | Description |
|---|---|
| 0 | Memory boot interface disabled |
| 3 | Boot on SD card/e.MMC memory enabled |
Bits 7:4 – INSTANCE_ID[3:0] IP Instance ID
| Value | Description |
|---|---|
| 0 | SDMMC0 |
| 1 | SDMMC1 |
| 2 | SDMMC2 |
Bits 3:0 – IFACE_IOSET[3:0] Memory IOSET
| Value | Description |
|---|---|
| 0 | PIO set 1 |