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SMS01GAF Datasheet(PDF) 33 Page - Numonyx B.V |
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SMS01GAF Datasheet(HTML) 33 Page - Numonyx B.V |
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33 / 61 page  SMSxxxAF, SMSxxxFF, SMSxxxBF Card registers 33/61 5.3 CSD Register The Card Specific Data Register provides information on how to access the card contents. The CSD Register defines the data format, error correction type, maximum data access time, data transfer speed, whether the DSR register can be used etc. The programmable register parameters (entries with cell type W or R, listed in Table 22) can be changed using CMD27. Table 22. CSD Fields Compatible with CSD Structure V1 / MM Card Specification V2.11 Name Field Width Cell Type(1) CSD-slice CSD structure CSD_STRUCTURE 2 R [127:126] reserved - 6 R [125:120] data read access-time-1 TAAC 8 R [119:112] data read access-time-2 in CLK cycles (NSAC*100) NSAC 8 R [111:104] Max. data transfer rate TRAN_SPEED 8 R [103:96] card command classes CCC 12 R [95:84] Max. read data block length READ_BL_LEN 4 R [83:80] partial blocks for read allowed READ_BL_PARTIAL 1 R [79:79] write block misalignment WRITE_BLK_MISALIGN 1 R [78:78] read block misalignment READ_BLK_MISALIGN 1 R [77:77] DSR implemented DSR_IMP 1 R [76:76] reserved - 2 R [75:74] device size C_SIZE 12 R [73:62] Max. read current @VDD min VDD_R_CURR_MIN 3 R [61:59] Max. read current @VDD max VDD_R_CURR_MAX 3 R [58:56] Max. write current @VDD min VDD_W_CURR_MIN 3 R [55:53] Max. write current @VDD max VDD_W_CURR_MAX 3 R [52:50] device size multiplier C_SIZE_MULT 3 R [49:47] erase single block enable ERASE_BLK_EN 1 R [46:46] sector size SECTOR_SIZE 7 R [45:39] write protect group size WP_GRP_SIZE 7 R [38:32] write protect group enable WP_GRP_ENABLE 1 R [31:31] reserved for MultiMediaCard compatibility - 2 R [30:29] write speed factor R2W_FACTOR 3 R [28:26] Max. write data block length WRITE_BL_LEN 4 R [25:22] partial blocks for write allowed WRITE_BL_PARTIAL 1 R [21:21] reserved - 5 R [20:16] File format group FILE_FORMAT_GRP 1 R/W(1) [15:15] copy flag (OTP) COPY 1 R/W(1) [14:14] permanent write protection PERM_WRITE_PROTECT 1 R/W(1) [13:13] |
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