Public Version
MMC/SD/SDIO Register Manual
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Table 24-77. MMCHS_CAPA
Address Offset
0x140
Physical Address
0x4809 C140
Instance
MMCHS1
0x480A D140
MMCHS3
0x480B 4140
MMCHS2
Description
Capabilities register. This register lists the capabilities of the MMC/SD/SDIO host controller.
Type
RW
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
Reserved
Reserved
MBL
BCF
TCF
DS
SRS
HSS
TCU
VS18
VS30
VS33
Reserved
Reserved
Bits
Field Name
Description
Type
Reset
31:27
Reserved
Reserved bit field. Do not write any value.
R
0x00
26
VS18
Voltage support 1.8V Initialization of this register (via a write access to this
RW
0
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 MMCi_RESET signal).
Read 0x0:
1.8 V Not Supported
Write 0x0:
1.8 V Not supported
Read 0x1:
1.8 V Supported
Write 0x1:
1.8 V Supported
MMCHS1, 2 and 3: This bit must be set to 1.
25
VS30
Voltage support 3.0V Initialization of this register (via a write access to this
RW
0
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 MMCi_RESET signal)
Read 0x0:
3.0 V Not Supported
Write 0x0:
3.0 V Not supported
Read 0x1:
3.0 V Supported
Write 0x1:
3.0 V Supported
MMCHS1: This bit must be set to 1.
MMCHS2 and 3: This bit must be left to 0.
24
VS33
Voltage support 3.3V Initialization of this register (via a write access to this
RW
0
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 MMCi_RESET signal)
Read 0x0:
3.3 V Not Supported
Write 0x0:
3.3 V Not supported
Read 0x1:
3.3 V Supported
Write 0x1:
3.3 V Supported
MMCHS1, 2 and 3: This bit must be left to 0.
23
SRS
Suspend/Resume support (SDIO cards only)This bit indicates whether the
R
1
host controller supports Suspend/Resume functionality.
Read 0x0:
The Host controller does not Suspend/Resume
functionality.
Read 0x1:
The Host controller supports Suspend/Resume
functionality.
22
DS
DMA support. This bit indicates that the Host Controller is able to use
R
1
DMA to transfer data between system memory and the Host Controller
directly.
Read 0x0:
DMA Not Supported
Read 0x1:
DMA Supported
3458
MMC/SD/SDIO Card Interface
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated