Specifications

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Physical Layer Simplified Specification Version 4.10

Note1: Bus Speed Mode is alias of Access Mode.

Note2: "Default" of Function 0 means that a function of just after the card initialized.

Note3: Notes for Power Limit

(1) Function 2 and 3 may be used only for embedded devices.

(2)

Allowed power consumption for removable cards shall be up to 1.80W, even though the Power

Limit is set to 2.16W or 2.88W

Table 4-11: Available Functions of CMD6

Function Group 1 is defined as Bus Speed Mode switch. If the card is initialized in 3.3V signal level,

Default Speed and High Speed are assigned to function 0 and 1. Then support bits of function 2 to 4

(SDR50, SDR104 and DDR50) are set to 0. If the card is initialized in 1.8V signal level, SDR and DDR

modes are assigned from function 0 to function 4.

Function Group 2 is defined for Command System extension. CMD34-37, CMD50 and CMD57 are

reserved for SD command system. OTP and ASSD are added. Refer to Part A1 Advanced Security

Extension (McEX), Part 1 OTP Addendum and Part A3 ASSD Core Specification for more detail.

Function Group 3 is defined as driver strength selection for UHS-I modes. This switch is effective in

1.8V signaling mode.

Function Group 4 is defined as Power Limit switch for total card power consumable. This field is set

Arg. Slice

[23:20]

[19:16]

[15:12]

[11:8]

[7:4]

[3:0]

Group No.

Function name reserved reserved

Power

Limit

Driver

Strength

Command

system

Access

mode

0x0

Default

0.72W

Default

Type B

Default

/ SDR12

0x1

Reserved

1.44W

Type A

For eC

High-Speed

/ SDR25

0x2

Reserved

2.16W

Type C

Reserved

SDR50

0x3

Reserved

2.88W

Type D

OTP

SDR104

0x4

Reserved

1.80W

Reserved

ASSD

DDR50

0x5

Reserved

0x6

Reserved

0x7

Reserved

0x8

Reserved

0x9

Reserved

0xA

Reserved

0xB

Reserved

0xC

Reserved

(eSD)

Reserved

0xD

Reserved

0xE

Reserved

Vendor

specific

Reserved

0xF

No influence