Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK データシート
製品コード
AT91SAM9N12-EK
595
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
35.14.6 HSMCI Command Register
Name: HSMCI_CMDR
Address:
0xF0008014
Access: Write-only
This register is write-protected while CMDRDY is 0 in HSMCI_SR. If an Interrupt command is sent, this register is only writable by
an interrupt response (field SPCMD). This means that the current command execution cannot be interrupted or modified.
an interrupt response (field SPCMD). This means that the current command execution cannot be interrupted or modified.
• CMDNB: Command Number
This is the command index.
• RSPTYP: Response Type
• SPCMD: Special Command
31
30
29
28
27
26
25
24
–
–
–
–
BOOT_ACK
ATACS
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
Value
Name
Description
0
NORESP
No response
1
48_BIT
48-bit response
2
136_BIT
136-bit response
3
R1B
R1b response type
Value
Name
Description
0
STD
Not a special CMD.
1
INIT
Initialization CMD:
74 clock cycles for initialization sequence.
74 clock cycles for initialization sequence.
2
SYNC
Synchronized CMD:
Wait for the end of the current data block transfer before sending the pending command.
Wait for the end of the current data block transfer before sending the pending command.
3
CE_ATA
CE-ATA Completion Signal disable Command.
The host cancels the ability for the device to return a command completion signal on
the command line.
The host cancels the ability for the device to return a command completion signal on
the command line.
4
IT_CMD
Interrupt command:
Corresponds to the Interrupt Mode (CMD40).
Corresponds to the Interrupt Mode (CMD40).
5
IT_RESP
Interrupt response:
Corresponds to the Interrupt Mode (CMD40).
Corresponds to the Interrupt Mode (CMD40).
6
BOR
Boot Operation Request.
Start a boot operation mode, the host processor can read boot data from the MMC device
directly.
Start a boot operation mode, the host processor can read boot data from the MMC device
directly.
7
EBO
End Boot Operation.
This command allows the host processor to terminate the boot operation mode.
This command allows the host processor to terminate the boot operation mode.