Rainbow Electronics AT91CAP9S250A - Manual (Page 218)

218
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
Figure 23-3. Single Write Access, Row Closed, SDR-SDRAM Device
Figure 23-4. Burst Write Access, Row Closed, DDR-SDRAM Devices
Row a Col a
3 0 3
NOP PRCHG NOP ACT NOP WRITE NOP BST
SDCLK
A[12:0]
COMMAND
BA[1:0] 0 0
DM[1:0]
Trp=2
SDCLKN
D[31:0] DaDb
Trcd=2
Trp=2 Trcd=2
SDCLK
Row a col a A[12:0]
NOP PRCHG NOP ACT NOP WRITE NOP COMMAND
0
BA[1:0]
DQS[1:0]
Da Db Dc Dd De Df Dg Dh D [15:0]
3 0 3 DM[1:0]