SAM9G45 Atmel Corporation, SAM9G45 Datasheet - Page 146
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SAM9G45
Manufacturer Part Number
SAM9G45
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9261.pdf
(248 pages)
2.SAM9261.pdf
(1274 pages)
3.SAM9261.pdf
(43 pages)
4.SAM9G45.pdf
(10 pages)
5.SAM9G45.pdf
(55 pages)
6.SAM9G45.pdf
(1196 pages)
Specifications of SAM9G45
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
No
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
- SAM9261 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9G45 PDF datasheet #4
- SAM9G45 PDF datasheet #5
- SAM9G45 PDF datasheet #6
- Current page: 146 of 248
- Download datasheet (2Mb)
Bus Interface Unit
6.2.4
6.2.5
6-6
Byte and halfword accesses
AHB system considerations
This section describes byte and halfword accesses for:
•
•
•
Address alignment
The ARM926EJ-S BIU performs address alignment checking and aligns AHB
addresses to the necessary boundary. 16-bit accesses are aligned to halfword
boundaries, and 32-bit accesses to word boundaries.
Thumb instruction fetches
All instruction fetches, irrespective of the state of the ARM9EJ-S core, are made as
32-bit accesses on the AHB. If the ARM9EJ-S core is in Thumb state, then two
instructions can be fetched at a time.
Endianness and byte lane indication
The AMBA Specification (Rev 2.0) does not specify any explicit support for endianness.
The ARM926EJ-S processor provides a supplementary signal, DHBL, that indicates
which bytes are to be updated for write transfers and which bytes should contain valid
data for reads. This is created using the address, and the endianness of the access.
The CFGBIGEND signal indicates the current endianness setting used by the
ARM9EJ-S core, and reflects the value held in CP15 c1 (see Control Register c1 on
page 2-12).
Because writes are buffered, the value of the CFGBIGEND signal might be
inconsistent with DHBL if the write-buffer is not drained before changing the
endianness setting in the control register.
DHBL is encoded in little-endian format. For example, a value of b0001 indicates byte
0 in little-endian mode, and byte 3 in big-endian mode.
This section describes AHB considerations for:
•
•
•
Copyright © 2001-2003 ARM Limited. All rights reserved.
Address alignment
Thumb instruction fetches
Endianness and byte lane indication.
Single-layer AHB systems on page 6-7
Multi-layer AHB systems on page 6-7
Multi-AHB systems on page 6-8
ARM DDI0198D
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