====== SD Card Registers ======

{{template>:meta:template:pageinfo#tpl
|desc=Document SD Card registers.}}

===== OCR =====

<datatables  order='[[0, "desc"]]'>
^ Bit      ^ Filed                       ^ Description                                                        ^ Addend                                          ^
| 31       | Card Power Up Status        | This bit is set if the card power up procedure has been finished.  |                                                 |
| 30       | Card Capcity Status         | * 0 - SDSC \\ * 1 - SDHC/SDXC                                      | [[#card_capcity_status_ccs|{{mdi>note-text}}]]  |
| 29       | UHS-II Card Status          | * 0 - non UHS-II Card \\ * 1 - UHS-II Card                         |                                                 |
| 28 : 25  | Resv                        |                                                                    |                                                 |
| 24       | Switching to 1.8V Accepted  | * 0 - non UHS-I Card \\ * 1 - UHS-I Card                           |                                                 |
| 23       | 3.5 ~ 3.6V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 22       | 3.4 ~ 3.5V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 21       | 3.3 ~ 3.4V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 20       | 3.2 ~ 3.3V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 19       | 3.1 ~ 3.2V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 18       | 3.0 ~ 3.1V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 17       | 2.9 ~ 3.0V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 16       | 2.8 ~ 2.9V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 15       | 2.7 ~ 2.8V                  | VDD __voltage range__ supported by the SD card.                    |                                                 |
| 14 : 0   | Resv                        |                                                                    |                                                 |

</datatables>

<wrap #ccs />
=== Card Capcity Status (CCS) ===
''CCS'' field is valid __after bit 31 is set__. When ''CCS'' in <wrap reg>OCR</wrap> is cleared, it indicates that the card is a <wrap abbr>SDSC</wrap>. The __arguments (data addresses)__ for the following commands are __in bytes__. Otherwise, they are in __units of ''512'' bytes__.
  * ''CMD17''/''CMD18''
  * ''CMD24''/''CMD25''
  * ''CMD28''/''CMD29''/''CMD30''
  * ''CMD32''/''CMD33''

===== CSD =====
^ Field          ^ Bit      ^ Description                                                                        ^ Addend                                         ^
| <wrap #csd_c_size />''C_SIZE''     | 73:62    | Used to compute the device capacity for devices __up to 2 GB of density__.         | [[#calculating_sd_density|{{mdi>note-text}}]]  |

===== Extend CSD =====
^ Field          ^ Byte     ^ Description                                                                        ^ Addend                                         ^
| <wrap #ext_csd_sec_count />''SEC_COUNT''  | 215:212  | Used to compute the device capacity for devices __greater than 2 GB of density__.  | [[#calculating_sd_density|{{mdi>note-text}}]]  |

=== Calculating SD Density ===
== Densities Greater than 2GB ==
Device density = ''[[#ext_csd_sec_count|SEC_COUNT]]'' * ''512B''

<callout type="warning">
''[[#csd_c_size|C_SIZE]]'' should be set to ''0xfff''.
</callout>