ATSAM3S-EK Atmel, ATSAM3S-EK Datasheet - Page 936
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ATSAM3S-EK
Manufacturer Part Number
ATSAM3S-EK
Description
KIT EVAL FOR ATSAM3S4C
Manufacturer
Atmel
Series
SAM3Sr
Type
MCUr
Specifications of ATSAM3S-EK
Contents
Board, Cables, Power Supply
Silicon Manufacturer
Atmel
Core Architecture
ARM
Core Sub-architecture
Cortex-M3
Kit Contents
Board
Features
TFT Colour LCD Display, SD/MMC Interface
Svhc
No SVHC (15-Dec-2010)
Rohs Compliant
Yes
For Use With/related Products
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATSAM3S-EK
Manufacturer:
Atmel
Quantity:
135
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936
SAM3S Preliminary
load sent by the host, while the current data payload is received by the USB device. Thus two
banks of memory are used. While one is available for the microcontroller, the other one is locked
by the USB device.
Figure 37-10. Bank Swapping in Data OUT Transfers for Ping-pong Endpoints
When using a ping-pong endpoint, the following procedures are required to perform Data OUT
transactions:
1. The host generates a Data OUT packet.
2. This packet is received by the USB device endpoint. It is written in the endpoint’s FIFO
3. The USB device sends an ACK PID packet to the host. The host can immediately send
4. The microcontroller is notified that the USB device has received a data payload, polling
5. The number of bytes available in the FIFO is made available by reading RXBYTECNT
6. The microcontroller transfers out data received from the endpoint’s memory to the
7. The microcontroller notifies the USB peripheral device that it has finished the transfer
8. A third Data OUT packet can be accepted by the USB peripheral device and copied in
9. If a second Data OUT packet has been received, the microcontroller is notified by the
10. The microcontroller transfers out data received from the endpoint’s memory to the
Bank 0.
a second Data OUT packet. It is accepted by the device and copied to FIFO Bank 1.
RX_DATA_BK0 in the endpoint’s UDP_CSRx register. An interrupt is pending for this
endpoint while RX_DATA_BK0 is set.
in the endpoint’s UDP_CSRx register.
microcontroller’s memory. Data received is made available by reading the endpoint’s
UDP_FDRx register.
by clearing RX_DATA_BK0 in the endpoint’s UDP_CSRx register.
the FIFO Bank 0.
flag RX_DATA_BK1 set in the endpoint’s UDP_CSRx register. An interrupt is pending
for this endpoint while RX_DATA_BK1 is set.
microcontroller’s memory. Data received is available by reading the endpoint’s
UDP_FDRx register.
1 st Data Payload
2 nd Data Payload
3 rd Data Payload
Microcontroller
Write and Read at the Same Time
Bank 0
Endpoint 1
Bank 1
Endpoint 1
Bank 0
Endpoint 1
Write
USB Device
Bank 0
Endpoint 1
Bank 1
Endpoint 1
Bank 0
Endpoint 1
Read
USB Bus
2 nd Data Payload
3 rd Data Payload
1 st Data Payload
Data IN Packet
Data IN Packet
Data IN Packet
6500C–ATARM–8-Feb-11
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