Cypress FM4 Series - Example of Controlling Alternative Boot Mode (Using ADMA)

CHAPTER 15: SD Card Interface
910 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
3.1 Example of Controlling Alternative Boot Mode (Using ADMA)
Figure 3-2 Alternative Boot Mode Operation
Start
Create Descriptor table
(1)
Set ADMA System Address Register
(2)
Set Argument 1 Register
(5)
Set Transfer Mode Register
(6)
Set MMC/eSD Control Register
(3)
Set Command Register
(8)
Wait for
Transfer Complete Interrupt,
ADMA Error Interrupt, Data * Error
Interrupt and Boot Acknowledge
Error Interrupt
(11)
(12)
Check
Interrupt Status
Transfer Complete Int.
occurs
Clear Transfer Complete Interrupt
Status
(13)
End
Clear ADMA Error, Data * Error Status
or Boot Acknowledge Error Interrupt
Status
(14)
ADMA Error Interrupt, Data * Error
Interrupt, or Boot Acknowledge Error
Interrupt occurs
Abort ADMA
Operation
Set Host Control 1 Register
(4)
(15)
Wait for
Command Complete Interrupt
(9)
Clear Command Complete
Interrupt Status
(10)
(7)
Set Timeout Control Register