AT32UC3C1512C Automotive Atmel Corporation, AT32UC3C1512C Automotive Datasheet - Page 883

• Manufacturer Part Number: AT32UC3C1512C Automotive
• Manufacturer: Atmel Corporation

32.6.2.12
32.6.2.13
9166C–AVR-08/11
Multi packet mode and single packet mode.
Management of control endpoints
• Overview
• Control write
Single packet mode is the default mode where one USB packet is managed per bank.
The multi-packet mode allows the user to manage data exceeding the maximum endpoint size
(UECFGn.EPSIZE) for an endpoint bank across multiple packets without software intervention.
This mode can also be coupled with the ping-pong mode.
A SETUP request is always ACKed. When a new SETUP packet is received, the RXSTPI is set,
but not the Received OUT Data Interrupt (RXOUTI) bit.
The FIFO Control (FIFOCON) bit in UECONn is irrelevant for control endpoints. The user should
therefore never use it for these endpoints. When read, this value is always zero.
Control endpoints are managed using:
Figure 32-9 on page 884
ler will not necessarily send a NAK on the first IN token:
• For an OUT endpoint, the EPn_PCKSIZE_BK0/1.MULTI_PACKET_SIZE field should be
• For an IN endpoint, the EPn_PCKSIZE_BK0/1.BYTE_COUNT field should be configured
• The RXSTPI bit: is set when a new SETUP packet is received. This has to be cleared by
• The RXOUTI bit: is set when a new OUT packet is received. This has to be cleared by
• The Transmitted IN Data Interrupt (TXINI) bit: is set when the current bank is ready to accept
• If the user knows the exact number of descriptor bytes that will be read, the status stage can
• Alternatively the bytes can be read until the NAKed IN Interrupt (NAKINI) is triggered,
configured correctly to enable the multi-packet mode. See
endpoints” on page
initialized to 0.
correctly to enable the multi-packet mode.
886. For single packet mode, the BYTE_COUNT should be less than EPSIZE.
firmware in order to acknowledge the packet and to free the bank.
firmware in order to acknowledge the packet and to free the bank.
a new IN packet. This has to be cleared by firmware in order to send the packet.
be predicted, and a zero-length packet can be sent after the next IN token.
notifying that all bytes are sent by the host and that the transaction is now in the status stage.
888. For single packet mode, the MULTI_PACKET_SIZE should be
shows a control write transaction. During the status stage, the control-
See”Multi packet mode for IN endpoints” on page
”Multi packet mode for OUT
AT32UC3C
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