Product manual

Table 3.10: CSD Register Bit Deﬁnitions

Field Description Width Bits *Value Code

CSD_STRUCTURE CSD structure 2 127–126 1.0 00b

— 6 125–120 — 000000b

TAAC Data read access time 8 119–112 10 ms 00001111b

NSAC Data read access time 8 111–104 0 00000000b

TRAN_SPEED Max data transfer rate 8 103–96 25 MHz 00110010b

CCC Command classes 12 95–84 All 1F5h

READ_BL_LEN Max read block length 4 83–80 512 bytes 1001h

READ_BL_PARTIAL Partial read blocks allowed 1 79–79 Yes 1b

WRITE_BLK_MISALIGN Write block misalignment 1 78–78 No 0b

READ_BLK_MISALIGN Read block misalignment 1 77–77 No 0b

DSR_IMP DSR implemented 1 76–76 No 0b

— Reserved 2 75–74 — 00b

C_SIZE Device size 12 73–62 899 383h

VDD_R_CURR_MIN Max. Read current at Vdd min 3 61–59 100 mA 111b

VDD_R_CURR_MAX Max. Read current at Vdd max 3 58–56 80 mA 110b

VDD_W_CURR_MIN Max. Write current at Vdd min 3 55–53 100 mA 111b

VDD_W_CURR_MAX Max. Write current at

Vdd max

3 52–50 80 mA 110b

C_SIZE_MULT Device size multiplier 3 49–47 32 011b

ERASE_BLK_EN Erase single block enable 1 46–46 Yes 1b

SECTOR_SIZE Erase sector size 7 45–39 32 blocks 0011111b

WP_GRP_SIZE Write protect group size 7 38–32 128

sectors

1111111b

WP_GRP_ENABLE Write protect group enable 1 31–31 Yes 1b

— Reserved 2 30–29 — 00b

R2W_FACTOR Write speed factor 3 28–26 X16 100b

3 28–26 X4 010b

WRITE_BL_LEN Max write block length 4 25–22 512 bytes 1001b

WRITE_BL_PARTIAL Partial write allowed 1 21–21 No 0b

— Reserved 5 20–16 — 00000b

FILE_FORMAT_GRP File format group 1 15–15 0 0b

COPY Copy flag 1 14–14 Not

original

PERM_WRITE_PROTECT Permanent write protection 1 13–13 Not

protected

TMP_WRITE_PROTECT Temporary write protection 1 12–12 Not

protected

FILE_FORMAT File format 2 11–10 HD w/

partition

00b

— Reserved 2 9–8 — 00b

126 Chapter 3