HB28K032MM3 Datasheet, PDF(26/91 Page) Renesas Technology Corp – MultiMediaCard 32 MByte/64 MByte/128 MByte/256 MByte/512 MByte

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HB28K032MM3 Datasheet, PDF (26/91 Pages) Renesas Technology Corp – MultiMediaCard 32 MByte/64 MByte/128 MByte/256 MByte/512 MByte

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HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3

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 Âµs at 20 MHz):

bit5...bit0 bit31...bit0

start bit host command argument

Note: 1. (Cyclic Redundancy Check)

bit6...bit0

CRC*1

end bit

The start bit is always â0â in command frames (sent from host to MultiMediaCard). The host bit is always

â1â for commands. The command field contains the binary coded command number. The argument

depends on the command (refer to Table âBasic Commands (class 0) and Table âBlock-Oriented Read

Commands (class 2)â). The CRC field is defined in Chapter âCyclic Redundancy Check (CRC)â.

Rev.0.02, Sep.15.2004, page 26 of 89

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