Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Hoja De Datos
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AT91SAM9N12-EK
429
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
Figure 31-12. Single Read Access, Row Close, Latency = 3, DDR2-SDRAM Device
Figure 31-13. Single Read Access, Row Close, Latency = 2, SDR-SDRAM Device
Trp
Trcd
Latency = 2
SDCLK
Row a
Col a
A[12:0]
NOP
PRCHG
NOP
ACT
NOP
READ
COMMAND
0
BA[1:0]
DQS[1]
DQS[0]
Da
Db
D[15:0]
3
DM[1:0]
Row a
col a
NOP
PRCHG
NOP
ACT
NOP
READ
BST
NOP
0
Trp
Trcd
Latency = 2
SDCLK
A[12:0]
COMMAND
BA[1:0]
DaDb
D[31:0]
3
DM[3:0]