Datasheet

559
SAM9X35 [DATASHEET]
11055E–ATARM–10-Mar-2014
• RXRDY_TXKL: Received OUT Data/KILL Bank
– Received OUT Data (for OUT endpoint or Control endpoint):
This bit is set by hardware after a new packet has been stored in the endpoint FIFO.
This bit is cleared by the device firmware after reading the OUT data from the endpoint.
For multi-bank endpoints, this bit may remain active even when cleared by the device firmware, this if an other packet has been
received meanwhile.
Hardware assertion of this bit may generate an interrupt if enabled by the UDPHS_EPTCTLx register RXRDY_TXKL bit.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint) and by UDPHS_EPTCTLDISx (disable endpoint).
– KILL Bank (for IN endpoint):
– The bank is really cleared or the bank is sent, BUSY_BANK_STA is decremented.
– The bank is not cleared but sent on the IN transfer, TX_COMPLT
– The bank is not cleared because it was empty. The user should wait that this bit is cleared before trying to clear
another packet.
Note: “Kill a packet” may be refused if at the same time, an IN token is coming and the current packet is sent on the UDPHS
line. In this case, the TX_COMPLT bit is set. Take notice however, that if at least two banks are ready to be sent, there
is no problem to kill a packet even if an IN token is coming. In fact, in that case, the current bank is sent (IN transfer)
and the last bank is killed.
• TX_COMPLT: Transmitted IN Data Complete
This bit is set by hardware after an IN packet has been accepted (ACK’ed) by the host.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint), and by UDPHS_EPTCTLDISx (disable endpoint).
• TXRDY: TX Packet Ready
This bit is cleared by hardware after the host has acknowledged the packet.
For Multi-bank endpoints, this bit may remain clear even after software is set if another bank is available to transmit.
Hardware clear of this bit may generate an interrupt if enabled by the UDPHS_EPTCTLx register TXRDY bit.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint), and by UDPHS_EPTCTLDISx (disable endpoint).
• RX_SETUP: Received SETUP
– (for Control endpoint only)
This bit is set by hardware when a valid SETUP packet has been received from the host.
It is cleared by the device firmware after reading the SETUP data from the endpoint FIFO.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint), and by UDPHS_EPTCTLDISx (disable endpoint).
• STALL_SNT: Stall Sent
– (for Control, Bulk and Interrupt endpoints)
This bit is set by hardware after a STALL handshake has been sent as requested by the UDPHS_EPTSTAx register FRCESTALL
bit.
This bit is reset by UDPHS_EPTRST register EPT_x (reset endpoint) and by UDPHS_EPTCTLDISx (disable endpoint).
• NAK_IN: NAK IN
This bit is set by hardware when a NAK handshake has been sent in response to an IN request from the Host.
This bit is cleared by software.