Toshiba H1 Series - Manual (Page 429)

TMP92CZ26A
92CZ26A-426
(b) Interrupt transfer type
Interrupt transfer type use transaction format same with transmission bulk
transfer.
When transmission by using toggle bit, hardware setting and answer in UDC
are same with transmission bulk transfer. Interrupt transfer can be transferred
without using toggle bit. In this case, if ACK handshake from host is not received,
toggle bit is renewed, and finish normally. UDC clears FIFO for next transfer.
(b-1) Interrupt transmitting mode (Toggle mode)
UDC operation is same with bulk transmission mode. Please refer to section
(a).
(b-2) Interrupt transmission mode (Not toggle mode)
This is same bulk transmission mode basically. However, if ACK handshake
from host is not received, transaction is different.
After transmit data packet,
When ACK handshake from host is received,
• Clear FIFO.
• Clear DATASET register.
• Renew toggle bit and prepare for next.
• Set STATUS to READY.
UDC finishes normally by above transaction. FIFO can be received next data.
If it is time out without receiving ACK from host,
• Clear FIFO.
• Clear DATASET register.
• Renew toggle bit and prepare for next.
• Set STATUS to TX_ERR.
Execute above setting. This setting is same with except STATUS.