The following table lists the SD flash interface signals.
For boot pin planning, see MIO Boot Interfaces. The SD MIO signals are also listed in the first PMC MIO signal table in the MIO-at-a-Glance Tables.
Note: In the case of a default speed (DS) mode,
the outputs are driven on the negative edge of the SD_CLK.
| Signal Name | Description | MIO | ||
|---|---|---|---|---|
| SD v2.0 | SD v3.0 | MIO-at-a-Glance Table | I/O | |
| Route Signals as a Group | ||||
|
SD_CLK |
Clock output | CLK | O | |
| SD_CMD | Command | CMD | I/O | |
| SD_DATA [0:3] | Four data, address, control I/O signals | D [0:3] | I/O | |
| - | SD_SEL | Select signal is automatically asserted when SD3.0 mode is selected. Select signal enables an external voltage translator to switch from 3.3V to 1.8V to operate the SD card at the highest performance supported. | SEL | O |
| - | SD_DIR_CMD | DIR_CMD output, determines if the command is an input or output. | DIRC | O |
| - | SD_DIR0 | DIR 0 output determines if Data 0 is an input or output. | DIR 0 | O |
| - | SD_DIR1_2_3 | DIR 1 output determines if Data [1:3] direction is an input or output. | DIR 1 | O |
| Independently Route-able Signals 1 | ||||
|
SD_DETECT2 |
Card detect input indicator | CD | I | |
|
SD_WP |
Write protect input indicator | WP | I | |
|
SD_BUSPWR |
Bus power control output | PWR | O | |
|
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