Multimedia Card Registers
18.5.1.24 SD_CUR_CAPA Register (offset = 248h) [reset = 0h]
SD_CUR_CAPA is shown in
and described in
.
This register indicates the maximum current capability for each voltage. The value is meaningful if the
voltage support is set in the capabilities register (SD_CAPA). 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 mmc_RESET signal).
Figure 18-60. SD_CUR_CAPA Register
31
30
29
28
27
26
25
24
Reserved
R-0h
23
22
21
20
19
18
17
16
CUR_1V8
R/W-0h
15
14
13
12
11
10
9
8
CUR_3V0
R/W-0h
7
6
5
4
3
2
1
0
CUR_3V3
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 18-43. SD_CUR_CAPA Register Field Descriptions
Bit
Field
Type
Reset
Description
31-24
Reserved
R
0h
23-16
CUR_1V8
R/W
0h
Maximum current for 1.8 V
0x0(R) = The maximum current capability for this voltage is not
available. Feature not implemented.
15-8
CUR_3V0
R/W
0h
Maximum current for 3.0 V
0x0(R) = The maximum current capability for this voltage is not
available. Feature not implemented.
7-0
CUR_3V3
R/W
0h
Maximum current for 3.3 V
0x0(R) = The maximum current capability for this voltage is not
available. Feature not implemented.
3439
SPRUH73H – October 2011 – Revised April 2013
Multimedia Card (MMC)
Copyright © 2011–2013, Texas Instruments Incorporated