at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 210

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

22.5.5.3
210
AT91SAM9G20 Preliminary
Deep Power-down Mode
This mode is selected by programming the LPCB field to 3 in the SDRAMC Low Power Register.
When this mode is activated, all internal voltage generators inside the SDRAM are stopped and
all data is lost.
When this mode is enabled, the application must not access to the SDRAM until a new initializa-
tion sequence is done (See
This is described in
Figure 22-8. Deep Power-down Mode Behavior
SDRAMC_A[12:0]
Figure
D[31:0]
SDWE
(input)
SDCS
SDCK
CKE
RAS
CAS
22-8.
“SDRAM Device Initialization” on page
Row n
col c col d
Dnb
Dnc
Dnd
t
RP
= 3
202).
6384B–ATARM–15-Dec-08