Toshiba H1 Series - Manual (Page 443)

TMP92CZ26A
92CZ26A-440
In renewed frame, Packet A’s FIFO interchange packet B’s FIFO, and
transaction is used same flow.
If SOF token is not received by error and so on, this data is lost because of
frame is not renewed. Nothing problem in receiving PID and if frame data is
received with CRC error, USB sets LOST to STATUS on FRAME register, and
frame number is not renewed. However, in this case, SOF is asserted and
FIFO condition is renewed. If SOF token is received without transmit and
transfer Isochronous in frame, UDC clears FIFO (X Condition) and sets
STATUS to FULL.
These are shown in Figure 3.16.14.