SAM9G45 Atmel Corporation, SAM9G45 Datasheet - Page 167

• 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

8.7
ARM DDI0198D
CPBURST
The CPBURST signal is used by the external coprocessor to indicate the number of
words to be transferred in an LDC or STC operation. CPBURST is used by the
ARM926EJ-S memory system to optimize LDC/STC instructions that access either
noncachable or nonbufferable regions of memory. The encoding of CPBURST is
shown in Table 8-2.
The encoding for a single word transfer and an unknown number of transfers is the
same. If CPBURST is set to b0000 for an STC or LDC operation, and this results in an
access to either a noncached or nonbuffered region of memory, then any resultant AHB
bus transfers are performed as individual nonsequential accesses.
CPBURST is driven by external coprocessors in the same cycle as the CHSDE
response. This must be driven to b0000 at all other times. An example of a transfer that
uses CPBURST is shown in Figure 8-9 on page 8-12.
Copyright © 2001-2003 ARM Limited. All rights reserved.
CPBURST[3:0]
b0000
b0001
b0010
…
b1110
b1111
Table 8-2 CPBURST encoding
Number of words
to transfer
1 word or unknown
2 words
3 words
…
15 words
16 words
Coprocessor Interface
8-11