AT91SAM9G45-EKES Atmel, AT91SAM9G45-EKES Datasheet - Page 240

• Manufacturer Part Number: AT91SAM9G45-EKES
• Description: KIT EVAL FOR AT91SAM9G45
• Manufacturer: Atmel
• Series: AT91SAM Smart ARMr
• Type: MCUr

Specifications of AT91SAM9G45-EKES

• Contents: Board
• Processor To Be Evaluated: SAM9G45
• Data Bus Width: 32 bit
• Interface Type: I2C, SPI, UART
• Maximum Operating Temperature: + 50 C
• Minimum Operating Temperature: - 10 C
• Operating Supply Voltage: 1.8 V to 3.3 V
• For Use With/related Products: AT91SAM9G45
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: Q4626953

Figure 22-8. Write Command Followed By a Read Command without Burst Write Interrupt, Low-power DDR1-SDRAM
Figure 22-9. Single Write Access Followed By A Read Access Low-power DDR1-SDRAM Devices
240
COMMAND
DQS[1:0]
COMMAND
DM[1:0]
SDCLK
BA[1:0]
D[15:0]
A[12:0]
DQS[1:0]
DM[1:0]
SDCLK
BA[1:0]
D[15:0]
A[12:0]
AT91SAM9G45
Device
NOP
0
3
0
3
NOP
In the case of a single write access, write operation should be interrupted by a read access but
DM must be input 1 cycle prior to the read command to avoid writing invalid data. See
9 on page
PRCHG
col a
240.
Row a
NOP
WRITE
ACT
0
Da
Twrd = BL/2 +2 = 8/2 +2 = 6
NOP
Db
Dc
WRITE
Da
Dd De Df
NOP
col a
0
Dg Dh
NOP
3
col a
3
Db
Twr = 1
READ
READ
BST
BST
Data masked
Da Db
Da Db
NOP
6438F–ATARM–21-Jun-10
NOP
Figure 22-