Atmel AVR XMEGA AU series

478
8331B–AVR–03/12
Atmel AVR XMEGA AU
36.11 SDRAM init
Figure 36-35. SDRAM init
Mode Register
CLK
CKE
CAS
RAS
DQM
BA[1:0]
A[11:0]
D
0x400
Precharge All Banks Auto Refresh** Load Mode Register NOP*
* The number of NOPs is equal to RPDLY[2:0] (RPDLY = 1 is shown)
NOP**
** The Auto Refresh and following NOPs are repeated 8 times
The number of NOPs is equal to ROWCYCDLY[2:0] (ROWCYCDLY = 1 is shown)
Clk
PER2
WE
CS