Datasheet

213
XMEGA B [DATASHEET]
8291B–AVR–01/2013
When an OUT token is detected and the device address of the token packet does not match that of the endpoint, the
packet is discarded and the USB module returns to idle and waits for the next token packet.
18.3.4 IN
If an IN token is detected the, the USB module fetches the endpoint CTRL and STATUS register data from the addressed
input endpoint in the endpoint configuration table. If the endpoint is disabled, the USB module returns to idle and waits for
the next token packet.
If the STALL flag in endpoint CTRL register is set, and the endpoint is not isochronous, a STALL handshake is returned
to the host, the STALL flag in the endpoint STATUS register and the STALL interrupt flag (STALLIF) in
INTFLAGSACLR/SET are set.
If BUSNACK0 is set, OVF in the endpoint STATUS register and OVFIF in the INTFLAGSACLR/SET register are set. If
the endpoint is not isochronous, a NAK handshake is returned to the host.
The data in the data buffer pointed to by the endpoint DATAPTR register are sent to the host in a DATA0 packet if the
endpoint is isochronous; otherwise, a DATA0 or DATA1 packet according to TOGGLE is sent. When the number of data
bytes specified in endpoint CNT is sent, the CRC is appended and sent to the host. If not, a ZLP handshake is returned
to the host.
For isochronous endpoints, BUSNACK0 and TRNCOMPL0 in the endpoint STATUS register are set. TRNIF is set, and
the endpoint's configuration table address is written to the FIFO if the transaction complete FIFO mode is enabled.
For all non-isochronous endpoints, the USB module waits for an ACK handshake from the host. If an ACK handshake is
not received within 16 USB clock cycles, the USB module returns to idle and waits for the next token packet. If an ACK
handshake was successfully received, BUSNACK0 and TRNCOMPL0 are set and TOGGLE is toggled. TRNIF is set and
the endpoint's configuration table address is written to the FIFO if the transaction complete FIFO mode is enabled.
When an IN token is detected and the device address of the token packet does not match that of the endpoint, the packet
is discarded and the USB module returns to idle and waits for the next token packet.
Figure 18-5. IN transaction.
IN
TOKEN
ADDRESS
ADDRESS
MATCH?
ENDPOINT
LEGAL
ENDPOINT?
EP STATUS
ENABLED?
DATA
ACK
PAYLOAD
OK?
IDLE
oNoNoN
No
STALL &
NO ISO?
STALL
NAK
No
READ
CONFIG
READ
DATA
READ
CONFIG
UPDATE
STATUS
Yes
seYseYs
e
Y
Yes
BUSNACK0
SET?
ISO?
Yes
No
ISO?
ACK
SET?
NoYes
Yes
Yes
No
No
ZLP
CRC