Specifications

©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
88
• SIZE_OF_PROTECTED_AREA
Setting this field differs between SDSC and SDHC/SDXC.
In case of SDSC Card, the capacity of protected area is calculated as follows:
Protected Area = SIZE_OF_PROTECTED_AREA_* MULT * BLOCK_LEN.
SIZE_OF_PROTECTED_AREA is specified by the unit in MULT*BLOCK_LEN.
In case of SDHC and SDXC Cards, the capacity of protected area is calculated as follows:
Protected Area = SIZE_OF_PROTECTED_AREA
SIZE_OF_PROTECTED_AREA is specified by the unit in byte.
• SPEED_CLASS
This 8-bit field indicates the Speed Class. Classes lower than indicated by this field are also effective.
For example, Class 10 is indicated, host should consider Class 2 to 6 is also effective.
SPEED_CLASS
Value Definition
00h
Class 0
01h
Class 2
02h
Class 4
03h
Class 6
04h
Class 10
05h – FFh
Reserved
Table 4-44: Speed Class Code Field
Application Note:
If a Class value indicated in SD Status (including reserved value)
is larger than that of host
supported, the host should read as any Class can be used with the card.
• PERFORMANCE_MOVE
This 8-bit field indicates Pm and the value can be set by 1 [MB/sec] step. If the card does not move
used RUs, Pm should be considered as infinity. Setting to FFh means infinity. The minimum value of
Pm is defined by in Table 4-45. Pm is defined for Class 2 to 6 in Default Speed Mode. When host uses
Class 10, Pm indicated in SD Status shall be ignored and treated as 0.
PERFORMANCE_MOVE
Value Definition
00h
Sequential Write
01h
1 [MB/sec]
02h
2 [MB/sec]
.......
......
FEh
254 [MB/sec]
FFh
Infinity
Table 4-45: Performance Move Field