SAM9M10 Atmel Corporation, SAM9M10 Datasheet - Page 75
SAM9M10
Manufacturer Part Number
SAM9M10
Description
Manufacturer
Atmel Corporation
Datasheets
1.M40800.pdf
(284 pages)
2.SAM9261.pdf
(248 pages)
3.SAM9M10.pdf
(59 pages)
4.SAM9M10.pdf
(1398 pages)
Specifications of SAM9M10
Flash (kbytes)
0 Kbytes
Pin Count
324
Max. Operating Frequency
400 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
160
Ext Interrupts
160
Usb Transceiver
3
Usb Speed
Hi-Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
2
Uart
5
Lin
4
Ssc
2
Ethernet
1
Sd / Emmc
2
Graphic Lcd
Yes
Video Decoder
Yes
Camera Interface
Yes
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
440
Resistive Touch Screen
Yes
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
64
Self Program Memory
NO
External Bus Interface
2
Dram Memory
DDR2/LPDDR, SDRAM/LPSDR
Nand Interface
Yes
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8/3.3
Operating Voltage (vcc)
0.9 to 1.1
Fpu
No
Mpu / Mmu
No / Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
No
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3.3.1
ARM DDI 0029G
Nonsequential cycles
Bus cycle types are encoded on the nMREQ and SEQ signals as listed in Table 3-1.
A memory controller for the ARM7TDMI processor must commit to a memory access
only on an N-cycle or an S-cycle.
A nonsequential cycle is the simplest form of bus cycle, and occurs when the processor
requests a transfer to or from an address that is unrelated to the address used in the
preceding cycle. The memory controller must initiate a memory access to satisfy this
request.
The address class and (nMREQ and SEQ) signals that comprise an N-cycle are
broadcast on the bus. At the end of the next bus cycle the data is transferred between the
CPU and the memory. It is not uncommon for a memory system to require a longer
access time (extending the clock cycle) for nonsequential accesses. This is to allow time
for full address decoding or to latch both a row and column address into DRAM. This
is illustrated in Figure 3-2 on page 3-6.
In Figure 3-2 on page 3-6, nMREQ and SEQ are highlighted where they are valid to
indicate the N-cycle.
Note
Copyright © 1994-2001. All rights reserved.
nMREQ
0
0
1
1
SEQ
0
1
0
1
Bus cycle type
N-cycle
S-cycle
I-cycle
C-cycle
Description
Nonsequential cycle
Sequential cycle
Internal cycle
Coprocessor register transfer cycle
Table 3-1 Bus cycle types
Memory Interface
3-5
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