Datasheet

567
SAM9261 [DATASHEET]
Atmel-6062O-ATARM-SAM9261-Datasheet_21-Jun-16
34.10.6 MCI Command Register
Name: MCI_CMDR
Address: 0xFFFA8014
Access: Write-only
This register is write-protected while CMDRDY is 0 in MCI_SR. If an Interrupt command is sent, this register is only write-
able by an interrupt response (field SPCMD). This means that the current command execution cannot be interrupted or
modified.
• CMDNB: Command Number
MultiMedia Card bus command numbers are defined in the MultiMedia Card specification.
• RSPTYP: Response Type
• SPCMD: Special Command
• OPDCMD: Open Drain Command
0: Push pull command
1: Open drain command
31 30 29 28 27 26 25 24
––––––––
23 22 21 20 19 18 17 16
– – – TRTYP TRDIR TRCMD
15 14 13 12 11 10 9 8
– – – MAXLAT OPDCMD SPCMD
76543210
RSPTYP CMDNB
Value Response Type
0 0 No response.
0 1 48-bit response.
1 0 136-bit response.
1 1 Reserved.
Value Command
0 0 0 Not a special CMD.
001
Initialization CMD:
74 clock cycles for initialization sequence.
010
Synchronized CMD:
Wait for the end of the current data block transfer before sending the pending command.
0 1 1 Reserved.
100
Interrupt command:
Corresponds to the Interrupt Mode (CMD40).
101
Interrupt response:
Corresponds to the Interrupt Mode (CMD40).