Multimedia Card Registers
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18.5.1.1 SD_SYSCONFIG Register (offset = 110h) [reset = 0h]
SD_SYSCONFIG is shown in Figure 18-37 and described in Table 18-20.
This register allows controlling various parameters of the OCP interface.
Figure 18-37. SD_SYSCONFIG Register
31 30 29 28 27 26 25 24
Reserved
R-0h
23 22 21 20 19 18 17 16
Reserved
R-0h
15 14 13 12 11 10 9 8
Reserved Reserved Reserved CLOCKACTIVITY
R-0h R-0h R-0h R/W-0h
7 6 5 4 3 2 1 0
Reserved SIDLEMODE ENAWAKEUP SOFTRESET AUTOIDLE
R-0h R/W-0h R/W-0h R/W-0h R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 18-20. SD_SYSCONFIG Register Field Descriptions
Bit Field Type Reset Description
31-14 Reserved R 0h
13-12 Reserved R 0h
11-10 Reserved R 0h
9-8 CLOCKACTIVITY R/W 0h Clocks activity during wake up mode period.
Bit 8 is the Interface clock.
Bit 9 is the Functional clock.
0x0 = Interface and Functional clock may be switched off.
0x1 = Interface clock is maintained. Functional clock may be
switched-off.
0x2 = Functional clock is maintained. Interface clock may be
switched-off.
0x3 = Interface and Functional clocks are maintained.
7-5 Reserved R 0h
4-3 SIDLEMODE R/W 0h
Power management
0x0 = If an idle request is detected, the MMC/SD/SDIO host
controller acknowledges it unconditionally and goes in Inactive
mode. Interrupt and DMA requests are unconditionally deasserted.
0x1 = If an idle request is detected, the request is ignored and the
module keeps on behaving normally.
0x2 = If an idle request is detected, the module will switch to wake
up mode based on its internal activity, and the wake up capability
can be used if the wake up capability is enabled (bit
SD_SYSCONFIG[2] ENAWAKEUP bit is set to 1).
0x3 = Reserved.
2 ENAWAKEUP R/W 0h
Wake-up feature control
0x0 = Wake-up capability is disabled.
0x1 = Wake-up capability is enabled.
1 SOFTRESET R/W 0h Software reset.
The bit is automatically reset by the hardware.
During reset, it always returns 0.
0x0(W) = No effect
0x0(R) = Normal mode
0x1(W) = Trigger a module reset.
0x1(R) = The module is reset.
3390
Multimedia Card (MMC) SPRUH73H–October 2011–Revised April 2013
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