Manual

780
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
41.10.6 MCI Command Register
Name: MCI_CMDR
Access Type: 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
• RSPTYP: Response Type
• SPCMD: Special Command
• OPDCMD: Open Drain Command
0 = Push pull command
1 = Open drain command
• MAXLAT: Max Latency for Command to Response
0 = 5-cycle max latency
31 30 29 28 27 26 25 24
–––––– IOSPCMD
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
RSP Response Type
0 0 No response.
0 1 48-bit response.
1 0 136-bit response.
1 1 Reserved.
SPCMD 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.
011Reserved.
100
Interrupt command:
Corresponds to the Interrupt Mode (CMD40).
101
Interrupt response:
Corresponds to the Interrupt Mode (CMD40).