AT91SAM9R64-CU Atmel, AT91SAM9R64-CU Datasheet - Page 213
AT91SAM9R64-CU
Manufacturer Part Number
AT91SAM9R64-CU
Description
MCU ARM9 64K SRAM 144-LFBGA
Manufacturer
Atmel
Series
AT91SAMr
Specifications of AT91SAM9R64-CU
Core Processor
ARM9
Core Size
16/32-Bit
Speed
240MHz
Connectivity
EBI/EMI, I²C, MMC, SPI, SSC, UART/USART, USB
Peripherals
AC'97, POR, PWM, WDT
Number Of I /o
49
Program Memory Size
32KB (32K x 8)
Program Memory Type
ROM
Ram Size
72K x 8
Voltage - Supply (vcc/vdd)
1.08 V ~ 1.32 V
Data Converters
A/D 3x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
144-LFBGA
Processor Series
AT91SAMx
Core
ARM926EJ-S
Data Bus Width
32 bit
Data Ram Size
64 KB
Interface Type
2-Wire, SPI, SSC, USART
Maximum Clock Frequency
240 MHz
Number Of Programmable I/os
118
Number Of Timers
4
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
JTRACE-ARM-2M, MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
AT91SAM-ICE, AT91-ISP, AT91SAM9RL-EK
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 3 Channel
Controller Family/series
AT91SAM9xxx
No. Of I/o's
49
Ram Memory Size
64KB
Cpu Speed
240MHz
No. Of Timers
3
Rohs Compliant
Yes
Package
144LFBGA
Device Core
ARM926EJ-S
Family Name
91S
Maximum Speed
240 MHz
Operating Supply Voltage
1.8|3.3 V
For Use With
AT91SAM-ICE - EMULATOR FOR AT91 ARM7/ARM9
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AT91SAM9R64-CU
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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23.5.4
Figure 23-5. Refresh Cycle Followed by a Read Access
6289C–ATARM–28-May-09
SDRAMC_A[12:0]
D[31:0]
SDWE
(input)
SDCS
SDCK
RAS
CAS
SDRAM Controller Refresh Cycles
Row n
col c col d
Dnb
Dnc
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).
When the SDRAM Controller initiates a refresh of the SDRAM device, internal memory accesses
are not delayed. However, if the CPU tries to access the SDRAM, the slave indicates that the
device is busy and the master is held by a wait signal. See
Dnd
t
RP
= 3
AT91SAM9R64/RL64 Preliminary
t
RC
= 8
Figure
Row m
23-5.
t
RCD
= 3
col a
CAS = 2
Dma
213
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