6 mci command register – Rainbow Electronics AT91CAP9S250A User Manual
Page 780
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
7
6
5
4
3
2
1
0
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.
0
0
1
Initialization CMD:
74 clock cycles for initialization sequence.
0
1
0
Synchronized CMD:
Wait for the end of the current data block transfer before sending the
pending command.
0
1
1
Reserved.
1
0
0
Interrupt command:
Corresponds to the Interrupt Mode (CMD40).
1
0
1
Interrupt response:
Corresponds to the Interrupt Mode (CMD40).