Cypress FM4 Series - Page 901

CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 901
Bit
Attribute
Description
08
RW
MMC DDR Select
This bit determines whether the SD card interface executes the DDR transfer on the
MMC.
To execute a data transfer other than the DDR transfer on the MMC, set this bit to 0.
Before setting this bit to 1, set the SD Clock Enable bit in the Clock Control Register and
stop SD_CLK.
0: Selects the SDR transfer.
1: Selects the DDR transfer.
Set/Reset
Condition
Set
1 Write
Reset (0)
XRESET_I
Software Reset For All
0 Write
07-04
Rsvd
Reserved
03
RW
VCCQ Control for MMC
This bit sets the value of VCCQ for the MMC.
The value of this bit becomes the value of VCCQ.
0: Selects "0" as the value of VCCQ.
1: Selects "1" as the value of VCCQ.
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
0 Write
02
RW
VCC Control for MMC
This bit sets the value of VCC for the MMC.
The value of this bit becomes the value of VCC.
0: Selects 0 as the value of VCC.
1: Selects 1 as the value of VCC.
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
0 Write