sd_csd Struct Reference

SD card specific data register. More...

#include <sd_spec.h>

Data Fields
uint8_t	csd_structure
	CSD structure [127:126].
uint8_t	read_time1
	Data read access-time-1 [119:112].
uint8_t	read_time2
	Data read access-time-2 in clock cycles (NSAC*100) [111:104].
uint8_t	xfer_rate
	Maximum data transfer rate [103:96].
uint16_t	cmd_class
	Card command classes [95:84].
uint8_t	read_blk_len
	Maximum read data block length [83:80].
uint16_t	flags
	Flags in _sd_csd_flag.
uint32_t	device_size
	Device size [73:62].
uint8_t	read_current_min
	Maximum read current at VDD min [61:59].
uint8_t	read_current_max
	Maximum read current at VDD max [58:56].
uint8_t	write_current_min
	Maximum write current at VDD min [55:53].
uint8_t	write_current_max
	Maximum write current at VDD max [52:50].
uint8_t	dev_size_mul
	Device size multiplier [49:47].
uint8_t	erase_size
	Erase sector size [45:39].
uint8_t	write_prtect_size
	Write protect group size [38:32].
uint8_t	write_speed_factor
	Write speed factor [28:26].
uint8_t	write_blk_len
	Maximum write data block length [25:22].
uint8_t	file_fmt
	File format [11:10].

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