Samsung S5PC110, Manual

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S5PC110_UM 7 SD/MMC CONTROLLER
7-18
7.4.13 SEQUENCE USING DMA
START
Set Block Size Reg
(1)
Set Block Count Reg
(2)
Set Argument Reg
(3)
Set Transfer Mode Reg
(4)
Set Command Reg
(5)
Set System Address Reg
(6)
Wait for Command
Complete Interrupt
Clear Command Complete
Status
Command Complete Int occur
Get Response Data
(7)
(8)
(9)
Wait for Transfer
Complete Int and DMA
Interrupt
Check Interrupt Status
DMA Interrupt
occur
Transfer Complete
Interrupt occur
Clear DMA Status Interrupt
Set System Address Reg
(10)
(11)
(12)
(13)
Clear Transfer Complete
status
Clear DMA Interrupt status
(14)
END
Figure 7-12 Transaction Control with Data Transfer Using DAT Line Sequence (Using DMA)
1. Set the system address for DMA in the System Address register.
2. Set the value corresponding to the executed data byte length of one block in the Block Size register.
3. Set the value corresponding to the executed data block count in the Block Count register (BLKCNT).
4. Set the value corresponding to the issued command in the Argument register (ARGUMENT).
5. Set the values for Multi / Single Block Select and Block Count Enable.
At this time, set the value corresponding to the issued command for Data Transfer Direction, Auto CMD12 Enable
and DMA Enable.
6. Set the value corresponding to the issued command in the Command register (CMDREG).
NOTE:
If the upper byte is written in the Command register, it issues a SD command and DMA is operated.