SAM9XE512 Atmel Corporation, SAM9XE512 Datasheet - Page 282

• Manufacturer Part Number: SAM9XE512
• Manufacturer: Atmel Corporation

Specifications of SAM9XE512

• Flash (kbytes): 512 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

Debug in depth
C.13.2 DBGRNG signal
C-42
Take, for example, the request by a debugger to breakpoint on the instruction at location
YYY when running process XXX in a multiprocess system. If the current process ID is
stored in memory, you can implement the above function with a watchpoint and
breakpoint chained together. The watchpoint address points to a known memory
location containing the current process ID, the watchpoint data points to the required
process ID, and the ENABLE bit is set to off.
The address comparator output of the watchpoint is used to drive the write enable for
the CHAINOUT latch. The input to the latch is the output of the data comparator from
the same watchpoint. The output of the latch drives the CHAIN input of the breakpoint
comparator. The address YYY is stored in the breakpoint register, and when the
CHAIN input is asserted, the breakpoint address matches, and the breakpoint triggers
correctly.
The DBGRNG signal is derived as follows:
DBGRNG = ((({Av[31:0],Cv[4,2:0]} XNOR {A[31:0],C[4,2:0]}) OR
{Am[31:0],Cm[4:0]}) == 0xFFFFFFFFF) AND
((({Dv[31:0],Cv[7:5]} XNOR {D[31:0],C[7:5]}) OR
Dm[31:0],Cm[7:5]}) == 0x7FFFFFFFF)
The RANGE input to Watchpoint unit 0 is derived as the address comparison of
Watchpoint unit 1, that is:
RANGEIN = ((Av[31:0] XNOR A[31:0]) OR Am[31:0] == 0xFFFF FFFF)
This RANGE input allows you to couple two breakpoints together to form range
breakpoints.
Selectable ranges are restricted to being powers of 2. For example, if a breakpoint is to
occur when the address is in the first 256 bytes of memory, but not in the first 32 bytes,
program the watchpoint registers as follows:
For Watchpoint 1:
1.
2.
3.
Program Watchpoint 1 with an address value of
mask of
Clear the ENABLE bit.
Program all other Watchpoint 1 registers as normal for a breakpoint.
An address within the first 32 bytes causes the RANGE output to go HIGH
because the address matches, but does not trigger the breakpoint because the
ENABLE is LOW.
Copyright © 2000 ARM Limited. All rights reserved.
0X0000001F
.
0x00000000
and an address
ARM DDI 0165B