Cypress FM4 Series - MMC;Esd Control Register

CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 899
2.42 MMC/eSD Control Register
This register controls the operations of the MMC/eSD.
D31 D19
D18
D17
D16
Rsvd
Boot Mode Enable for
MMC
Boot Auto Abort Enable
for MMC
Boot Ack Enable for
MMC
D15 D10
D09
D08
D07 D04
D03
D02
D01
D00
Rsvd
CMD / DAT Delay Select
MMC DDR Select
Rsvd
VCCQ
Control for MMC
VCC Control for MMC
RST_n Control for MMC
Lock-Reset Control
for eSD
Bit
Attribute
Description
31-19
Rsvd
Reserved
18
RW
Boot Mode Enable for MMC
This bit enables the boot mode of the MMC.
The execution of the boot operation in boot mode is triggered by this bit being 1 and a
write access to the Command Register.
For any other communication, including the boot operation in alternative boot mode,
execute such communication operation by setting this bit to 0 and making a write access
to the Command Register.
In addition, while a boot operation in boot mode is being executed, an Asynchronous
Abort can be executed on the boot operation in boot mode. If the Asynchronous Abort has
been enabled, always executes a software reset after executing an Asynchronous Abort.
0: Disables the boot operation in boot mode.
1: Enables the boot operation in boot mode.
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
0 Write