SAM9X25 Atmel Corporation, SAM9X25 Datasheet - Page 545

• Manufacturer Part Number: SAM9X25
• Manufacturer: Atmel Corporation

Specifications of SAM9X25

• Flash (kbytes): 0 Kbytes
• Pin Count: 217
• 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
• Can: 2
• Lin: 4
• Ssc: 1
• Ethernet: 2
• Sd / Emmc: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• 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: DDR/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

Figure 33-8. NYET Example with Two Endpoint Banks
33.6.9.3
33.6.9.4
33.6.9.5
11054A–ATARM–27-Jul-11
11054A–ATARM–27-Jul-11
t = 0
data 0 ACK
Data IN
Bulk IN or Interrupt IN
Bulk IN or Interrupt IN: Sending a Packet Under Application Control (Device to Host)
Bank 1
Bank 0
t = 125 μs
E
F
Data IN packets are sent by the device during the data or the status stage of a control transfer or
during an (interrupt/bulk/isochronous) IN transfer. Data buffers are sent packet by packet under
the control of the application or under the control of the DMA channel.
There are three ways for an application to transfer a buffer in several packets over the USB:
The application can write one or several banks.
A simple algorithm can be used by the application to send packets regardless of the number of
banks associated to the endpoint.
Algorithm Description for Each Packet:
The application is notified that it is possible to write a new packet to the DPR by the
TX_PK_RDY interrupt. This interrupt can be enabled or masked by setting the TX_PK_RDY bit
in the UDPHS_EPTCTLENB/UDPHS_EPTCTLDIS register.
Algorithm Description to Fill Several Packets:
Using the previous algorithm, the application is interrupted for each packet. It is possible to
reduce the application overhead by writing linearly several banks at the same time. The
AUTO_VALID bit in the UDPHS_EPTCTLx must be set by writing the AUTO_VALID bit in the
UDPHS_EPTCTLENBx register.
The auto-valid-bank mechanism allows the transfer of data (IN and OUT) without the interven-
tion of the CPU. This means that bank validation (set TX_PK_RDY or clear the RX_BK_RDY bit)
is done by hardware.
• packet by packet (see
•
• DMA (see
• The application waits for TX_PK_RDY flag to be cleared in the UDPHS_EPTSTAx register
• The application writes one USB packet of data in the DPR through the
• The application sets TX_PK_RDY flag in the UDPHS_EPTSETSTAx register.
data 1 NYET
64
before it can perform a write access to the DPR.
memory window.
KB (see
Bank 1
Bank 0
t = 250 μs
E'
F
33.6.9.6
33.6.9.5
Bank 1
Bank 0
PING ACK
F
E
below)
below)
33.6.9.5
t = 375 μs
Bank 1
Bank 0
data 0 NYET
below)
F
E
Bank 1
Bank 0
t = 500 μs
F
F
PING NACK
Bank 1
Bank 0
E'
F
t = 625 μs
Bank 1
Bank 0
PING ACK
E
F
64
E: empty
E': begin to empty
F: full
KB endpoint logical
SAM9X25
SAM9X25
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