Preliminary
Registers
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9.4.26 Capabilities Register (SD_CAPA)
This register lists the capabilities of the SD/SDIO host controller. The capabilities register (SD_CAPA) is
shown in
and described in
Figure 9-54. Capabilities Register (SD_CAPA)
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Reserved
64BIT
Rsvd
VS18
VS30
VS33
SRS
DS
HSS
Rsvd
AD2S
Rsvd
MBL
R-0
R/W-0
R-0
R/W-0
R/W-0
R/W-0
R-1
R-1
R-1
R-0
R-1
R-0
R-1h
15
14
13
8
7
6
5
0
Reserved
BCF
TCU
Rsvd
TCF
R-0
R-0
R-1
R-0
R-0
LEGENDR/W = Read/Write; R = Read only; -n = value after reset
Table 9-36. Capabilities Register (SD_CAPA) Field Descriptions
Bit
Field
Value
Description
31-29
Reserved
0
Reserved bit field. Do not write any value.
28
64BIT
64 Bit System Bus SupportSetting 1 to this bit indicates that the Host Controller supports
64-bit address descriptor mode and is connected to 64-bit address system bus.
Read 0
32 bit System bus address
Read 1
64 bit System bus address
27
Reserved
0
Reserved bit. Any write to this bit results in 0.
26
VS18
Voltage support 1.8 V. Initialization of this register (via a write access to this register) depends
on the system capabilities. The host driver shall not modify this register after the initialization.
This register is only reinitialized by a hard reset (via RESET signal).
Read 0
1.8 V not supported
Write 0
1.8 V not supported
Read 1
1.8 V supported
Write 1
1.8 V supported
25
VS30
Voltage support 3.0V. Initialization of this register (via a write access to this register) depends
on the system capabilities. The host driver shall not modify this register after the initialization.
This register is only reinitialized by a hard reset (via RESET signal)
Read 0
3.0 V not supported
Write 0
3.0 V not supported
Read 1
3.0 V supported
Write 1
3.0 V supported
24
VS33
Voltage support 3.3V. Initialization of this register (via a write access to this register) depends
on the system capabilities. The host driver shall not modify this register after the initialization.
This register is only reinitialized by a hard reset (via RESET signal)
Read 0
3.3 V not supported
Write 0
3.3 V not supported
Read 1
3.3 V supported
Write 1
3.3 V supported
23
SRS
Suspend/resume support (SDIO cards only). This bit indicates whether the host controller
supports Suspend/Resume functionality.
Read 0
The Host controller does not suspend/resume functionality.
Read 1
The Host controller supports suspend/resume functionality.
22
DS
DMA support. This bit indicates that the Host controller is able to use DMA to transfer data
between system memory and the Host controller directly.
Read 0
DMA not supported
Read 1
DMA supported
1002
Secure Digital (SD)/—Secure Digital I/O (SDIO) Card Interface
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
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