HB28E016/D032BP2
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
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 these Hitachi Mobile Embedded Flashes).
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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