sd_csd Struct Reference

SD card specific data register. More...

#include <sd_spec.h>

Data Fields
uint8_t	csd_structure
uint8_t	read_time1
uint8_t	read_time2
uint8_t	xfer_rate
uint16_t	cmd_class
uint8_t	read_blk_len
uint16_t	flags
uint32_t	device_size
uint8_t	read_current_min
uint8_t	read_current_max
uint8_t	write_current_min
uint8_t	write_current_max
uint8_t	dev_size_mul
uint8_t	erase_size
uint8_t	write_prtect_size
uint8_t	write_speed_factor
uint8_t	write_blk_len
uint8_t	file_fmt

Detailed Description

SD card specific data register.

Card specific data register. contains additional data about SD card.

Field Documentation

cmd_class

uint16_t sd_csd::cmd_class

Card command classes [95:84]

csd_structure

uint8_t sd_csd::csd_structure

CSD structure [127:126]

dev_size_mul

uint8_t sd_csd::dev_size_mul

Device size multiplier [49:47]

device_size

uint32_t sd_csd::device_size

Device size [73:62]

erase_size

uint8_t sd_csd::erase_size

Erase sector size [45:39]

file_fmt

uint8_t sd_csd::file_fmt

File format [11:10]

flags

uint16_t sd_csd::flags

Flags in _sd_csd_flag

read_blk_len

uint8_t sd_csd::read_blk_len

Maximum read data block length [83:80]

read_current_max

uint8_t sd_csd::read_current_max

Maximum read current at VDD max [58:56]

read_current_min

uint8_t sd_csd::read_current_min

Maximum read current at VDD min [61:59]

read_time1

uint8_t sd_csd::read_time1

Data read access-time-1 [119:112]

read_time2

uint8_t sd_csd::read_time2

Data read access-time-2 in clock cycles (NSAC*100) [111:104]

write_blk_len

uint8_t sd_csd::write_blk_len

Maximum write data block length [25:22]

write_current_max

uint8_t sd_csd::write_current_max

Maximum write current at VDD max [52:50]

write_current_min

uint8_t sd_csd::write_current_min

Maximum write current at VDD min [55:53]

write_prtect_size

uint8_t sd_csd::write_prtect_size

Write protect group size [38:32]

write_speed_factor

uint8_t sd_csd::write_speed_factor

Write speed factor [28:26]

xfer_rate

uint8_t sd_csd::xfer_rate

Maximum data transfer rate [103:96]

---

The documentation for this struct was generated from the following file:

• zephyr/sd/sd_spec.h