AT91SAM9G45-CU-999 Atmel, AT91SAM9G45-CU-999 Datasheet - Page 240

• Manufacturer Part Number: AT91SAM9G45-CU-999
• Description: IC MCU ARM9 APMC 324TFBGA
• Manufacturer: Atmel
• Series: AT91SAMr

Specifications of AT91SAM9G45-CU-999

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 400MHz
• Connectivity: EBI/EMI, Ethernet, I²C, IrDA, MMC, SPI, SSC, UART/USART, USB
• Peripherals: AC'97, DMA, I²S, LCD, POR, PWM, WDT
• Number Of I /o: 160
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: ROM
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 0.9 V ~ 1.1 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 324-TFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

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-