Datasheet

850
32072H–AVR32–10/2012
AT32UC3A3
• TRTYP: Transfer Type
• TRDIR: Transfer Direction
Writing a zero to this bit will configure the transfer direction as write transfer.
Writing a one to this bit will configure the transfer direction as read transfer.
• TRCMD: Transfer Command
• MAXLAT: Max Latency for Command to Response
Writing a zero to this bit will configure a 5-cycle max latency.
Writing a one to this bit will configure a 64-cycle max latency.
• OPDCMD: Open Drain Command
Writing a zero to this bit will configure the push-pull command.
Writing a one to this bit will configure the open-drain command.
• SPCMD: Special Command
TRTYP Transfer Type
0 MMC/SDCard Single Block
1 MMC/SDCard Multiple Block
2 MMC Stream
3 Reserved
4 SDIO Byte
5SDIO Block
others Reserved
TRCMD Transfer Type
0 No data transfer
1 Start data transfer
2 Stop data transfer
3 Reserved
SPCMD Command
0 Not a special CMD.
1
Initialization CMD:
74 clock cycles for initialization sequence.
2
Synchronized CMD:
Wait for the end of the current data block transfer before sending the pending command.
3
CE-ATA Completion Signal disable Command.
The host cancels the ability for the device to return a command completion signal on the
command line.
4
Interrupt command:
Corresponds to the Interrupt Mode (CMD40).
5
Interrupt response:
Corresponds to the Interrupt Mode (CMD40).
others Reserved