SAM9XE256 Atmel Corporation, SAM9XE256 Datasheet - Page 138
SAM9XE256
Manufacturer Part Number
SAM9XE256
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9260.pdf
(290 pages)
2.SAM9261.pdf
(248 pages)
3.SAM9XE128.pdf
(860 pages)
4.SAM9XE128.pdf
(48 pages)
Specifications of SAM9XE256
Flash (kbytes)
256 Kbytes
Pin Count
217
Max. Operating Frequency
180 MHz
Cpu
ARM926
Hardware Qtouch Acquisition
No
Max I/o Pins
96
Ext Interrupts
96
Usb Transceiver
3
Usb Speed
Full Speed
Usb Interface
Host, Device
Spi
2
Twi (i2c)
2
Uart
6
Ssc
1
Ethernet
1
Sd / Emmc
1
Graphic Lcd
No
Video Decoder
No
Camera Interface
Yes
Adc Channels
4
Adc Resolution (bits)
10
Adc Speed (ksps)
312
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
32
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)
1.65 to 1.95
Fpu
No
Mpu / Mmu
No / Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- SAM9260 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9XE128 PDF datasheet #3
- SAM9XE128 PDF datasheet #4
- Current page: 138 of 248
- Download datasheet (2Mb)
Tightly-Coupled Memory Interface
5.7
5-30
TCM write buffer
Each TCM interface has a two word entry write buffer. This is required to de-pipeline
the address and data values produced by the ARM9EJ-S core so that non-speculative
writes can be made to memory with SRAM characteristics peformed without
introducing stall cycles.
The ARM9EJ-S core read requests take priority over writes, and consequently TCM
transactions can be out of order with respect to instruction execution. If a read access
occurs to a location that also has a corresponding entry in the write-buffer, then data is
forwarded from the write-buffer. If it is necessary to ensure that all outstanding writes
have completed on the TCM interface then the CP15 drain write buffer instruction can
be used (
until all oustanding buffered writes (TCM and AHB) have been completed.
To guarantee that the TCM write buffers have been drained and that all outstanding
requests on the TCM interface have completed, a drain write buffer instruction must be
used prior to disabling either of the TCM regions.
Copyright © 2001-2003 ARM Limited. All rights reserved.
). This instruction does not complete execution
ARM DDI0198D
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