SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 416

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

25.7.1
Name:
Address:
Access:
Reset:
• MODE: SDRAMC Command Mode
This field defines the command issued by the SDRAM Controller when the SDRAM device is accessed.
416
416
Value
000
001
010
011
100
101
110
31
23
15
–
–
–
7
–
SAM3X/A
SAM3X/A
SDRAMC Mode Register
Name
NORMAL
NOP
ALLBANKS_PRECHARGE
LOAD_MODEREG
AUTO_REFRESH
EXT_LOAD_MODEREG
DEEP_POWERDOWN
SDRAMC_MR
0x400E0200
Read-write
0x00000000
30
22
14
–
–
–
6
–
29
21
13
–
–
–
5
–
Description
Normal mode. Any access to the SDRAM is decoded normally. To activate this mode,
command must be followed by a write to the SDRAM.
The SDRAM Controller issues a NOP command when the SDRAM device is accessed
regardless of the cycle. To activate this mode, command must be followed by a write to
the SDRAM.
The SDRAM Controller issues an “All Banks Precharge” command when the SDRAM
device is accessed regardless of the cycle. To activate this mode, command must be
followed by a write to the SDRAM.
The SDRAM Controller issues a “Load Mode Register” command when the SDRAM
device is accessed regardless of the cycle. To activate this mode, command must be
followed by a write to the SDRAM.
The SDRAM Controller issues an “Auto-Refresh” Command when the SDRAM device is
accessed regardless of the cycle. Previously, an “All Banks Precharge” command must
be issued. To activate this mode, command must be followed by a write to the SDRAM.
The SDRAM Controller issues an “Extended Load Mode Register” command when the
SDRAM device is accessed regardless of the cycle. To activate this mode, the “Extended
Load Mode Register” command must be followed by a write to the SDRAM. The write in
the SDRAM must be done in the appropriate bank; most low-power SDRAM devices use
the bank 1.
Deep power-down mode. Enters deep power-down mode.
28
20
12
–
–
–
4
–
27
19
11
–
–
–
3
–
26
18
10
–
–
–
2
MODE
25
17
–
–
9
–
1
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
24
16
–
–
8
–
0