at91cap7e ATMEL Corporation, at91cap7e Datasheet - Page 182

• Manufacturer Part Number: at91cap7e
• Description: Customizable Microcontroller
• Manufacturer: ATMEL Corporation

Figure 22-6. Self-refresh Mode Behavior
22.6.5.2
182
SDRAMC_A[12:0]
SDRAMC_SRR
SDCKE
SDWE
SDCK
SDCS
AT91CAP7E
Write
RAS
CAS
Low-power Mode
SRCB = 1
The SDRAM device must remain in self-refresh mode for a minimum period of t
remain in self-refresh mode for an indefinite period. This is described in
This mode is selected by programming the LPCB field to 2 in the SDRAMC Low Power Register.
Power consumption is greater than in self-refresh mode. All the input and output buffers of the
SDRAM device are deactivated except SDCKE, which remains low. In contrast to self-refresh
mode, the SDRAM device cannot remain in low-power mode longer than the refresh period (64
ms for a whole device refresh operation). As no auto-refresh operations are performed by the
SDRAM itself, the SDRAM Controller carries out the refresh operation. The exit procedure is
faster than in self-refresh mode.
This is described in
Figure
22-7.
Self Refresh Mode
to the SDRAM Controller
Access Request
T
Figure
XSR
= 3
22-6.
8549A–CAP–10/08
RAS
Row
and may