sdmmc_csd_mmc_t Struct Reference

CSD register structure for MMC. More...

Detailed Description

CSD register structure for MMC.

See also

JEDEC Standard No. JESD84-B42, MultiMediaCard (MMC) Electrical Standard, High Capacity (MMCA, 4.2), Section 8.3, Table 35 [jedec.org]

Definition at line 726 of file sdmmc.h.

#include <sdmmc.h>

Data Fields
uint32_t	CSD_CRC:8
	CRC including End bit 1b [7:0].
uint32_t	ECC:2
	ECC code [9:8].
uint32_t	FILE_FORMAT:2
	File format [11:10].
uint32_t	TMP_WRITE_PROTECT:1
	Temporary write protection [12].
uint32_t	PERM_WRITE_PROTECT:1
	Permanent write protection [13].
uint32_t	COPY:1
	Copy flag [14].
uint32_t	FILE_FORMAT_GRP:1
	File format group [15].
uint32_t	CONTENT_PROT_APP:1
	Content protection application [16].
uint32_t	reserved4:4
	reserved [20:17]
uint32_t	WRITE_BL_PARTIAL:1
	partial blocks for write allowed [21]
uint32_t	WRITE_BL_LEN:4
	Max. More...
uint32_t	R2W_FACTOR:3
	Write speed factor [28:26].
uint32_t	DEFAULT_ECC:2
	Manufacturer default ECC [30:29].
uint32_t	WP_GRP_ENABLE:1
	write protect group enable [31]
uint32_t	WP_GRP_SIZE:5
	Write protect group size [36:32].
uint32_t	ERASE_GRP_MULT:5
	Erase group size multiplier [41:37].
uint32_t	ERASE_GRP_SIZE:5
	Erase group size [46:42].
uint32_t	C_SIZE_MULT:3
	Device size multiplier [49:47].
uint32_t	VDD_W_CURR_MAX:3
	Max. More...
uint32_t	VDD_W_CURR_MIN:3
	Max. More...
uint32_t	VDD_R_CURR_MAX:3
	Max. More...
uint32_t	VDD_R_CURR_MIN:3
	Max. More...
uint16_t	C_SIZE:12
	Device size [73:62].
uint32_t	reserved2:2
	reserved [75:74]
uint32_t	DSR_IMP:1
	DSR implemented [76].
uint32_t	READ_BLK_MISALIGN:1
	Read block misalignment [77].
uint32_t	WRITE_BLK_MISALIGN:1
	Write block misalignment [78].
uint32_t	READ_BL_PARTIAL:1
	Partial blocks for read allowed [79].
uint32_t	READ_BL_LEN:4
	Max. More...
uint32_t	CCC:12
	Card command classes [95:84].
uint32_t	TRAN_SPEED:8
	Max. More...
uint32_t	NSAC:8
	Data read access-time-2 in CLK cycles [111:104].
uint32_t	TAAC:8
	Data read access-time-1 [119:112].
uint32_t	reserved1:2
	reserved [121:120]
uint32_t	SPEC_VERS:4
	Specification version [125:122].
uint32_t	CSD_STRUCTURE:2
	CSD structure [127:126].

Field Documentation

READ_BL_LEN

uint32_t sdmmc_csd_mmc_t::READ_BL_LEN

Max.

read data block length [83:80]

Definition at line 755 of file sdmmc.h.

TRAN_SPEED

uint32_t sdmmc_csd_mmc_t::TRAN_SPEED

Max.

bus clock frequency [103:96]

Definition at line 757 of file sdmmc.h.

VDD_R_CURR_MAX

uint32_t sdmmc_csd_mmc_t::VDD_R_CURR_MAX

Max.

read current VDD max [58:56]

Definition at line 747 of file sdmmc.h.

VDD_R_CURR_MIN

uint32_t sdmmc_csd_mmc_t::VDD_R_CURR_MIN

Max.

read current VDD min [61:59]

Definition at line 748 of file sdmmc.h.

VDD_W_CURR_MAX

uint32_t sdmmc_csd_mmc_t::VDD_W_CURR_MAX

Max.

write current VDD max [52:50]

Definition at line 745 of file sdmmc.h.

VDD_W_CURR_MIN

uint32_t sdmmc_csd_mmc_t::VDD_W_CURR_MIN

Max.

write current VDD min [55:53]

Definition at line 746 of file sdmmc.h.

WRITE_BL_LEN

uint32_t sdmmc_csd_mmc_t::WRITE_BL_LEN

Max.

write data block length [25:22]

Definition at line 737 of file sdmmc.h.

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

• drivers/include/sdmmc/sdmmc.h