40.8.37 e.MMC Control 1 Register
| Name: | MC1R |
| Offset: | 0x204 |
| Reset: | 0x00 |
| Property: | R/W |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| FCD | RSTN | BOOTA | OPD | DDR | CMDTYP[1:0] | ||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ||
Bit 7 – FCD e.MMC Force Card Detect
When using e.MMC, the user can set this bit to 1 to bypass the card detection procedure using the CD signal.
| Value | Name | Description |
|---|---|---|
| 0 | DISABLED | e.MMC Forced Card Detect is disabled. The CD signal is used and debounce timing is applied. |
| 1 | ENABLED | e.MMC Forced Card Detect is enabled. |
Bit 6 – RSTN e.MMC Reset Signal
This bit controls the e.MMC reset signal.
| Value | Description |
|---|---|
| 0 |
Reset signal is inactive. |
| 1 |
Reset signal is active. |
Bit 5 – BOOTA e.MMC Boot Acknowledge Enable
This bit must be set according to the value of BOOT_ACK in the Extended CSD Register (refer to “Embedded MultiMedia Card (e.MMC) Electrical Standard 4.51” ).
When this bit is set to 1, the peripheral waits for boot acknowledge pattern from the e.MMC before receiving boot data.
If the boot acknowledge pattern is wrong, the BOOTAE status flag rises in EISTR if BOOTAE is set in EISTER. An interrupt is generated if BOOTAE is set in EISIER.
If the no boot acknowledge pattern is received, the DATTEO status flag rises in EISTR if DATTEO is set in EISTER. An interrupt is generated if DATTEO is set in EISIER.
Bit 4 – OPD e.MMC Open Drain Mode
This bit sets the command line in open drain.
| Value | Description |
|---|---|
| 0 |
The command line is in push-pull. |
| 1 |
The command line is in open drain. |
Bit 3 – DDR e.MMC HSDDR Mode
This bit selects the High Speed DDR mode.
| Value | Description |
|---|---|
| 0 |
High Speed DDR is not selected. |
| 1 |
High Speed DDR is selected. Note: The clock divider (DIV) in CCR must be set to a value different from 0 when HSEN is 1. |
Bits 1:0 – CMDTYP[1:0] e.MMC Command Type
| Value | Name | Description |
|---|---|---|
| 0 | NORMAL | The command is not an e.MMC specific command. |
| 1 | WAITIRQ | This bit must be set to 1 when the e.MMC is in Interrupt mode (CMD40). Refer to “Interrupt Mode” in the “Embedded MultiMedia Card (e.MMC) Electrical Standard 4.51” . |
| 2 | STREAM | This bit must be set to 1 in the case of Stream Read(CMD11) or Stream Write (CMD20). Only effective for e.MMC up to revision 4.41. |
| 3 | BOOT | Starts a Boot Operation mode at the next write to CR. Boot data are read directly from e.MMC device. |