MC2GH256NMCA-2SA00 SAMSUNG [Samsung semiconductor], MC2GH256NMCA-2SA00 Datasheet - Page 34

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

• S_CMD_SET
This field defines which command sets are supported by the card.
• MIN_PERF_a_b_ff
These fields defines the overall minimum performance value for the read and write access with different bus width and
max clock frequency modes. The value in the register is coded as follows. Other than defined values are illegal.
Revision 0.3
Value
0x3C
0x8C
0x00
0x08
0x0A
0x0F
0x14
0x1E
0x28
0x32
0x46
0x50
0x64
0x78
0xA0
7-3
Bit
2
1
0
For Cards not reaching the 2.4MB/s minimum value
Class A: 2.4MB/s and is the lowest allowed value for MMCplus and MMCmobile(16x150kB/s)
Class B: 3.0MB/s and is the next allowed value (20x150kB/s)
Class C: 4.5MB/s and is the next allowed value (30x150kB/s)
Class D: 6.0MB/s and is the next allowed value (40x150kB/s)
Class E: 9.0MB/s and is the next allowed value (60x150kB/s)
This is also the highest class which any MMCplus or MMCmobile card is needed to support in low bus
category operation mode (26MHz with 4bit data bus).
A MMCplus or MMCmobile card supporting any higher class than this have to support this class also
(in low category bus operation mode).
Class F: Equals 12.0MB/s and is the next allowed value (80x150kB/s)
Class G: Equals 15.0MB/s and is the next allowed value (100x150kB/s)
Class H: Equals 18.0MB/s and is the next allowed value (120x150kB/s)
Class J: Equals 21.0MB/s and is the next allowed value (140x150kB/s)
This is also the highest class which any MMCplus or MMCmobile card is needed to support in mid bus
category operation mode (26MHz with 8bit data bus or 52MHz with 4bit data bus).
A MMCplus or MMCmobile card supporting any higher class than this have to support this Class (in
mid category bus operation mode) and Class E also (in low category bus operation mode)
Class K: Equals 24.0MB/s and is the next allowed value (160x150kB/s)
Class M: Equals 30.0MB/s and is the next allowed value (200x150kB/s)
Class O: Equals 36.0MB/s and is the next allowed value (240x150kB/s)
Class R: Equals 42.0MB/s and is the next allowed value (280x150kB/s)
Class T: Equals 48.0MB/s and is the last defined value (320x150kB/s)
Reserved
Content Protection SecureMMC
SecureMMC
Standard MMC
Table 5-28 : R/W Access Performance Value
34
Performance
Command Set
MultiMediaCard
Sep.22.2005
TM