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HB28D032MM2 Datasheet(PDF) 27 Page - Renesas Technology Corp |
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HB28D032MM2 Datasheet(HTML) 27 Page - Renesas Technology Corp |
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27 / 90 page  HB28H016/D032/B064/B128MM2 Rev.5.0, Jan. 2003, page 25 of 88 The command transmission always starts with the MSB. Each command starts with a start bit and ends with a 7-bit CRC command protection field followed by an end bit. The length of each command frame is fixed to 48 bits (2.4 µs at 20 MHz): 0 start bit 1 host 1 end bit bit5...bit0 command bit31...bit0 argument bit6...bit0 CRC*1 Note: 1. (Cyclic Redundancy Check) The start bit is always ‘0’ in command frames (sent from host to MultiMediaCard). The host bit is always ‘1’ for commands. The command field contains the binary coded command number. The argument depends on the command (refer to Table “Basic Commands (class 0) and Table “Block-Oriented Read Commands (class 2)”). The CRC field is defined in Chapter “Cyclic Redundancy Check (CRC)”. |
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