SAM7SE32 Atmel Corporation, SAM7SE32 Datasheet - Page 205
SAM7SE32
Manufacturer Part Number
SAM7SE32
Description
Manufacturer
Atmel Corporation
Specifications of SAM7SE32
Flash (kbytes)
32 Kbytes
Pin Count
144
Max. Operating Frequency
48 MHz
Cpu
ARM7TDMI
Hardware Qtouch Acquisition
No
Max I/o Pins
88
Ext Interrupts
88
Usb Transceiver
1
Usb Speed
Full Speed
Usb Interface
Device
Spi
1
Twi (i2c)
1
Uart
3
Ssc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
384
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
8
Self Program Memory
NO
External Bus Interface
1
Dram Memory
sdram
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
3.0 to 3.6
Fpu
No
Mpu / Mmu
Yes / No
Timers
3
Output Compare Channels
3
Input Capture Channels
3
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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23.6.2
6222F–ATARM–14-Jan-11
SDRAM Controller Read Cycle
The SDRAM Controller allows burst access or single access. To initiate a burst access, the
SDRAM Controller uses the transfer type signal provided by the master requesting the access. If
the next access is a sequential read access, reading to the SDRAM device is carried out. If the
next access is a sequential read access, but the current access is to a boundary page, or if the
next access is in another row, then the SDRAM Controller generates a precharge command,
activates the new row and initiates a read command. To comply with SDRAM timing parameters,
an additional clock cycle is inserted between the precharge/active (t
active/read (t
ply with CAS latency. The SDRAM Controller supports a CAS latency of two. For definition of
these timing parameters, refer to
described in
Figure 23-4. Read Burst, 32-bit SDRAM access
D[31:0]
A[12:0]
SDCS
SDWE
(Input)
SDCK
RAS
CAS
RCD
Figure 23-4
) command, After a read command, additional wait states are generated to com-
Row n
below.
t
RCD
= 3
col a
“SDRAMC Configuration Register” on page
CAS = 2
col b
Dna
col c
Dnb
col d
SAM7SE512/256/32
Dnc
col e
Dnd
col f
RP
Dne
) command and the
Dnf
213. This is
205
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