SAM9G25 Atmel Corporation, SAM9G25 Datasheet - Page 76

• Manufacturer Part Number: SAM9G25
• Manufacturer: Atmel Corporation

Specifications of SAM9G25

• Flash (kbytes): 0 Kbytes
• Pin Count: 247
• Max. Operating Frequency: 400 MHz
• Cpu: ARM926
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 105
• Ext Interrupts: 105
• Usb Transceiver: 3
• Usb Speed: Hi-Speed
• Usb Interface: Host, Device
• Spi: 2
• Twi (i2c): 3
• Uart: 7
• Lin: 4
• Ssc: 1
• Ethernet: 1
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: Yes
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 440
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 32
• Self Program Memory: NO
• External Bus Interface: 1
• 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

Memory Management Unit
3.2.6
3-12
Fine page table descriptor
31
Coarse page table descriptor bit assignments are described in Table 3-5.
A fine page table descriptor provides the base address of a page table that contains
second-level descriptors for large page, small page, or tiny page accesses. Fine page
tables have 1024 entries, splitting the 1MB that the table describes into 1KB blocks.
Figure 3-7 shows the format of a fine page table descriptor.
If a fine page table descriptor is returned from the first-level fetch, a second-level fetch
is initiated.
Bits
[31:10]
[9]
[8:5]
[4]
[3:2]
[1:0]
Copyright © 2001-2003 ARM Limited. All rights reserved.
Note
Fine page table base address
Description
These bits form the base for referencing the second-level descriptor (the coarse
page table index for the entry is derived from the MVA)
Always written as 0
These bits specify one of the 16 possible domains (held in the domain access
control registers) that contain the primary access controls
Always written as 1
Always written as 0
These bits must be 01 to indicate a coarse page table descriptor
Table 3-5 Coarse page table descriptor bits
Figure 3-7 Fine page table descriptor
12 11
SBZ
9 8
Domain
5 4 3 2 1 0
1 SBZ 1
ARM DDI0198D
1