hb28j128mm3 Renesas Electronics Corporation., hb28j128mm3 Datasheet - Page 26

• Manufacturer Part Number: hb28j128mm3
• Description: Multimediacard 32 Mbyte/64 Mbyte/128 Mbyte/256 Mbyte/512 Mbyte
• Manufacturer: Renesas Electronics Corporation.

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 s at 20 MHz):
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)”.
Rev.0.02, Sep.15.2004, page 26 of 89
Note: 1. (Cyclic Redundancy Check)
0
start bit
1
host
bit5...bit0
command
bit31...bit0
argument
bit6...bit0
CRC*
1
1
end bit