SAM9G45 Atmel Corporation, SAM9G45 Datasheet - Page 138

• Manufacturer Part Number: SAM9G45
• Manufacturer: Atmel Corporation

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

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