MC2GH256NMCA-2SA00 SAMSUNG [Samsung semiconductor], MC2GH256NMCA-2SA00 Datasheet - Page 88

• Manufacturer Part Number: MC2GH256NMCA-2SA00
• Description: SAMSUNG MultiMediaCard
• Manufacturer: SAMSUNG [Samsung semiconductor]

In Multiple Block read operations, in order to improve read performance, the card may fetch data from the memory array,
ahead of the host. In this case, when the host is reading the last addresses of the memory, the card attempts to fetch data
beyond the last physical memory address and generates an ADDRESS_OUT_OF_RANGE error.
Therefore, even if the host times the stop transmission command to stop the card immediately after the last byte of data
was read, the card may already have generated the error, and it will show in the response to the stop transmission com-
mand. The host should ignore this error.
Same as for MultiMediaCard mode.
Usage of card lock and unlock commands in SPI mode is identical to MultiMediaCard mode. In both cases, the command
response is of type R1b. After the busy signal clears, the host should obtain the result of the operation by issuing a
GET_STATUS command. Please refer to Chapter 6.2.10 for details.
7.17.1 Command Format
All the MultiMediaCard commands are 6 bytes long. The command transmission always starts with the left bit of the bit-
string corresponding to the command codeword. All commands are protected by a CRC. The commands and arguments
are listed in Table 7-5.
7.17.2 Command Classes
As in MultiMediaCard mode, the SPI commands are divided into several classes (See Table 7-4). Each class supports a
set of card functions. A MultiMediaCard will support the same set of optional command classes in both communication
modes (there is only one command class table in the CSD register). The available comand classes, and the supported
command for a specific class, however, are different in the MultiMediaCard and the SPI communication mode.
7.14 Read ahead in Multiple Block read operation
7.15 Memory Array Partitioning
7.16 Card Lock/unlock Operation
7.17 SPI Command Set
Revision 0.3
Bit position
Width (bits)
Description
Value
start bit
47
‘0’
1
transmission bit
46
‘1’
1
Table 7-3 : Command format in SPI Mode
command index
[45:40]
88
6
x
argument
[39:8]
32
x
MultiMediaCard
CRC7
[7:1]
7
x
Sep.22.2005
end bit
‘1’
0
1
TM