ATSAM3X4EA-AU Atmel, ATSAM3X4EA-AU Datasheet - Page 412

• Manufacturer Part Number: ATSAM3X4EA-AU
• Description: ARM Microcontrollers - MCU QFP144,GREEN, IND TEMP, MRL A
• Manufacturer: Atmel

Specifications of ATSAM3X4EA-AU

• Rohs: yes
• Core: ARM Cortex M3
• Processor Series: SAM3X
• Data Bus Width: 32 bit
• Maximum Clock Frequency: 84 MHz
• Program Memory Size: 256 KB
• Data Ram Size: 64 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.4 V to 3.6 V
• Operating Temperature Range: - 40 C to +85 C
• Package / Case: LQFP-144
• Mounting Style: SMD/SMT
• Factory Pack Quantity: 60

Figure 26-4. Read Burst with Boundary Row Access
26.6.4
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412
SDRAMC_A[12:0]
SDWE
SDCS
SDCK
DATA
RAS
CAS
SAM3X/A
SAM3X/A
SDRAM Controller Refresh Cycles
col a
Row n
col b
Dna
An auto-refresh command is used to refresh the SDRAM device. Refresh addresses are gener-
ated internally by the SDRAM device and incremented after each auto-refresh automatically.
The SDRAM Controller generates these auto-refresh commands periodically. An internal timer is
loaded with the value in the register SDRAMC_TR that indicates the number of clock cycles
between refresh cycles.
A refresh error interrupt is generated when the previous auto-refresh command did not perform.
It is acknowledged by reading the Interrupt Status Register (SDRAMC_ISR).
col c
Dnb
col d
Dnc
Dnd
T
RP
= 3
Row m
T
RCD
= 3
col a
CAS = 2
col b
Dma
col c
Dmb
col d
Dmc
11057B–ATARM–28-May-12
11057B–ATARM–28-May-12
col e
Dmd
Dme