Specifications
©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
53
4.3.10.4 Switch Function Status
The switch function status is the returned data block that contains function and current consumption
information. The block length is predefined to 512 bits and the use of SET_BLK_LEN command is not
necessary. Table 4-13 describes the status data structure.
The status bits of the response contain the information of the function group. Maximum current
consumption will be used only for the new function added through this command. In this case,
VDD_R_CURR_MIN, VDD_W_CURR_MIN, VDD_R_CURR_MAX and VDD_W_CURR_MAX values in
the CSD register provides the current consumption when all card functions are set to the default state
and can be used by spec 1.01 compatible hosts.
Bits
Description
Width
511:496
Maximum Current/Power Consumption
This field indicates total current/power consumption of the card including
enabled functions selected by the Function Selection ([399:376] bits)
dependent
on selected Bus Speed Mode.
The host should check the maximum current consumption
by mode 0 operation
and verify that it can supply the necessary current/power before executing
mode 1 operation.
Especially in UHS-I or UHS-
II mode, this field is related to Current Limit / Power
Limit setting. CMD6 mode 0 indicates the maximum current/power
of a selected
bus speed mode regardless of the setting of Current Limit / Power Limit. CMD6
mode 1 indicates the maximum current/power of a selected bus speed mode
depending on the setting of Current Limit.
Definition for SD I/F Mode
Value
Maximum Current(Power) Consumption at 3.6V
0
Error
1
1mA (3.6mW)
2
2mA (7.2mW)
3
3mA (10.8mW)
......
......
65,535
65,535mA (235926mW)
The voltage to calculate current consumption is defined at 3.6V.
Maximum current consumption is average over 1second.
Definition for UHS
-II Mode
For UHS-II Card, this field is defined as Maximum Power Consumption. Total
maximum power consumption of V
DD1
and V
DD2
is indicated. The definition of
Power Consumption in this field is equivalent to Current Consumption at 3.6V.
Refer to Current Limit / Power Limit in Section 4.3.10.3 about the relation
between power and current of VDD1 and VDD2.
Value
Maximum Power Consumption
0
Error
1
3.6mW (= 1mA x 3.6V)
2
7.2mW (= 2mA x 3.6V)
3
10.8mW (= 3mA x 3.6V)
......
......
65,535
235926mW
16