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Multimedia Card Registers
18.5.1.24 SD_CUR_CAPA Register (offset = 248h) [reset = 0h]
SD_CUR_CAPA is shown in Figure 18-60 and described in Table 18-43.
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)
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