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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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HB28D032MM2 bảng dữ liệu(PDF) 21 Page - Renesas Technology Corp |
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HB28D032MM2 bảng dữ liệu(HTML) 21 Page - Renesas Technology Corp |
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21 / 90 page  HB28H016/D032/B064/B128MM2 Rev.5.0, Jan. 2003, page 19 of 88 • DEFAULT_ECC Set by the card manufacturer and defines the ECC code which is recommended to use (e.g. the device is tested for). The value is set to ‘0’, indicating that no designated ECC is recommended. • R2W_FACTOR Defines the typical block program time as a multiple of the read access time. The following table defines the field format. R2W_FACTOR R2W_FACTOR Multiples of read access time 0 1 1 2 (write half as fast as read) 2 4 3 8 4 16 5 32 6, 7 reserved This parameter value is 2 for these Hitachi MultiMediaCards. • WRITE_BLK_LEN The data block length is computed as 2 WRITE_BLK_LEN. Data Block Length WRITE_BLK_LEN Block length Remark 0 2 0 = 1 byte 1 2 1 = 2 bytes ...... ...... 11 2 11 = 2048 bytes 12–15 reserved The block length might therefore be in the range 1, 2, 4...2048 bytes. This parameter defines the block length if WRITE_BLK_PARTIAL is not set. If WRITE_BLK_PARTIAL is set this parameter contains the maximum allowed value of the block length in bytes. All block lengths between one and this value are permitted. The actual block size is programmed by the command SET_BLOCKLEN (CMD16). These Hitachi MultiMediaCards support blocks with the length 512 bytes. The parameter WRITE_BLK_LEN is permanently assigned to the value 0x9 (512 bytes). |
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