SAM9G20 Atmel Corporation, SAM9G20 Datasheet - Page 816
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SAM9G20
Manufacturer Part Number
SAM9G20
Description
Manufacturer
Atmel Corporation
Datasheets
1.SAM9261.pdf
(248 pages)
2.SAM9261.pdf
(1274 pages)
3.SAM9261.pdf
(43 pages)
4.SAM9G20.pdf
(42 pages)
5.SAM9G20.pdf
(832 pages)
Specifications of SAM9G20
Flash (kbytes)
0 Kbytes
Pin Count
217
Max. Operating Frequency
400 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)
1
Uart
7
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)
95
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)
0.9 to 1.1
Fpu
No
Mpu / Mmu
No/Yes
Timers
6
Output Compare Channels
6
Input Capture Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
No
- SAM9261 PDF datasheet
- SAM9261 PDF datasheet #2
- SAM9261 PDF datasheet #3
- SAM9G20 PDF datasheet #4
- SAM9G20 PDF datasheet #5
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44.3.11
44.3.11.1
44.3.12
44.3.12.1
44.3.12.2
816
AT91SAM9G20
Two-wire Interface (TWI)
UHP
TWI: RXRDY Flag is not reset by a SOFTWARE Reset
UHP: Non-ISO IN Transfers
UHP: ISO OUT transfers
The RXRDY Flag is not reset when a Software reset is performed.
After a Software Reset, the Register TWI_RHR must be read.
Conditions:
Consider the following sequence:
Consequence: When this error occurs, the Host controller tries the same IN token again.
This problem can be avoided if the system guarantees that the status update can be completed
within the same frame.
Conditions:
Consider the following sequence:
Consequence: After the failure condition, the Host controller stops sending the SOF. This
causes the connected device to go into suspend state.
This problem can be avoided if the system can guarantee that no buffer underrun occurs during
the transfer.
1. The Host controller issues an IN token.
2. The Device provides the IN data in a short packet.
3. The Host controller writes the received data to the system memory.
4. The Host controller is now supposed to carry out two Write transactions (TD status
5. The Host controller raises the request for the first write transaction. By the time the
6. After completing the first write transaction, the Host controller skips the second write
1. The Host controller sends an ISO OUT token after fetching 16 bytes of data from the
2. When the Host controller is sending the ISO OUT data, because of system latencies,
3. While there is an underrun condition, if the Host controller is in the process of bit-stuff-
Problem Fix/Workaround
Problem Fix/Workaround
Problem Fix/Workaround
write and TD retirement write) to the system memory in order to complete the status
update.
transaction is completed, a frame boundary is crossed.
transaction.
system memory.
remaining bytes of the packet are not available. This results in a buffer underrun
condition.
ing, it causes the Host controller to hang.
6384E–ATARM–05-Feb-10
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