
406
XMEGA A [MANUAL]
8077I–AVR–11/2012
33.14 SDRAM 4-bit write
Figure 33-44.Single write
Prech
a
rg
eAll
Ba
nks
Bank Adr
0x0
D[3:0]
Row Adr
Col Adr
0x400
Act
ive
Wr
ite
NOP*
*
Single write
D[7:4]
* The number of NOPs is equal to ROWCOLDLY[2:0] (ROWCOLDLY = 1 is shown)
** The number of NOPs is equal to WRDLY[1:0] + 1 (WRDLY = 0 is shown)
*** The number of NOPs is equal to RPDLY[1:0] (RPDLY = 1 is shown)
CLK
CKE
CAS
RAS
DQM
BA[1:0]
A[11:0]
D
ClkPER2
WE
CS