AT91SAM9G45-CU-999 Atmel, AT91SAM9G45-CU-999 Datasheet - Page 253

• 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 22-25. Anticipate Precharge/Active Command in Bank 2 during Read Access in Bank 1
6438F–ATARM–21-Jun-10
COMMAND
DQS[1:0]
BA[1:0]
DM1:0]
D[15:0]
A[12:0]
SDClK
NOP
0
3
READ
1
The arbitration type is round-robin arbitration. This algorithm dispatches the requests from differ-
ent masters to the SDRAM device in a round-robin manner. If two or more master requests arise
at the same time, the master with the lowest number is serviced first, then the others are ser-
viced in a round-robin manner. To avoid burst breaking and to provide the maximum throughput
for the SDRAM device, arbitration may only take place during the following cycles:
1. Idle cycles: When no master is connected to the SDRAM device.
2. Single cycles: When a slave is currently doing a single access.
3. End of Burst cycles: When the current cycle is the last cycle of a burst transfer. For
4. Anticipated Access: When an anticipate read access is done while current access is
Anticipate command, Precharge/Active Bank 2
bursts of defined length, predicted end of burst matches the size of the transfer. For
bursts of undefined length, predicted end of burst is generated at the end of each four
beat boundary inside the INCR transfer.
not complete, the arbitration scheme can be changed if the anticipated access is not
the next access serviced by the arbitration scheme.
PRECH
Read access in Bank 1
2
Trp
NOP
Da
Db
ACT
Dc
Dd
READ
1
De
Df
Dg
AT91SAM9G45
Dh
NOP
Di
Dj
Dk
Dl
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