HB288032MM1 Datasheet, PDF (24/80 Pages) Hitachi Semiconductor – MultiMediaCard 32 MByte

HB288032MM1
The command transmission always starts with the MSB. Each command starts with a start bit and ends with
a 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
1
bit5...bit0 bit31...bit0
start bit host command argument
Note: 1. (Cyclic Redundancy Check)
bit6...bit0
CRC*¹
1
end bit
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)”. The
HB288032MM1 supports the following MultiMediaCard commands:
24