Specifications
©Copyright 2001-2013 SD Group (Panasonic, SanDisk, Toshiba) and SD Card Association
Physical Layer Simplified Specification Version 4.10
19
3.9.6 Summary of Bus Speed Mode for UHS-I Card
Table 3-6 shows the card requirements regarding Bus Speed modes selected by CMD6 function group
1. The maximum frequency and the maximum power are determined by CMD6.
Bus Speed
Mode
*1
Max. Bus
Speed
Max. Clock
Frequency
Signal
Voltage
Max. Power
*2
[W]
[MB/s]
[MHz]
[V]
SDSC
*3
SDHC
*4
SDXC
*5
SDR104
104
208
1.8
-
2.88
*6
2.88
*6
SDR50
50
100
1.8
-
1.44
1.44
DDR50
50
50
1.8
-
1.44
1.44
SDR25
25
50
1.8
-
0.72
0.72
SDR12
12.5
25
1.8
-
0.36
0.36/0.54
*7
High Speed
25
50
3.3
0.72
0.72
0.72
Default Speed
12.5
25
3.3
0.36
0.36
0.36/0.54
*7
*1: The card supports a UHS-I mode shall support all lower UHS-I modes.
*2: Host may control power by the Power Limit function in CMD6 (Refer to Section 4.3.10.3).
*3: SDSC stands for SD Standard Capacity Memory Card and
*4: SDHC stands for SD High Capacity Memory Card.
*5: SDXC stands for SD Extended Capacity Memory Card.
*6: The actual maximum current may vary from the limit described in this table. It is limited by the
Mechanical Addenda in the sections that define the thermal profile of the device and the connector
profile.
*7: Host may select either maximum power by XPC in ACMD41 (Refer to Section 4.2.3.1).
In SPI mode, XPC is not supported and the power shall be up to 0.36W (100mA at 3.6V on VDD1).
Table 3-6 : Bus Speed Modes of UHS-I Card
DS - Default Speed up to 25MHz 3.3V signaling
HS - High Speed up to 50MHz 3.3V signaling
SDR12 - SDR up to 25MHz 1.8V signaling
SDR25 - SDR up to 50MHz 1.8V signaling
SDR50 - SDR up to 100MHz 1.8V signaling
SDR104 - SDR up to 208MHz 1.8V signaling
DDR50 - DDR up to 50MHz 1.8V signaling
Table 3-7 clarifies option / mandatory of bus speed mode for each card capacity type.
Card Classification
DS
HS
SDR50
SDR104
DDR50
SDSC
M
O
N/A
N/A
N/A
SDHC
Non UHS-I
M
O
N/A
N/A
N/A
UHS50
M
M
M
N/A
O (Standard SD)
M (microSD)
UHS104
M
M
M
M
O (Standard SD)
M (microSD)
SDXC
Non UHS-I
M
O
N/A
N/A
N/A
UHS50
M
M
M
N/A
O (Standard SD)
M (microSD)
UHS104
M
M
M
M
O (Standard SD)
M (microSD)
M: Mandatory, O: Optional, N/A: Not Available
Table 3-7 : Bus Speed Mode Option / Mandatory