Toshiba TLCS-900/H1 Series Manual page 253

(b) Interrupt transfer type
Interrupt transfer type uses the same transaction format as transmission bulk
transfer.
For transmission using toggle bit, hardware setting and answer in the UDC are
the same as for 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 is normal. The UDC clears FIFO for next transfer.
(b-1) Interrupt transmitting mode (Toggle mode)
UDC operation is same as in bulk transmission mode. Please refer to section
(a).
(b-2) Interrupt transmission mode (Not toggle mode)
This is basically the same as bulk transmission mode. However, if ACK
handshake from host is not received, transaction is different.
When ACK handshake from host is received after transmission of data packet,
Clear FIFO.
• Clear DATASET register.
•
Renew toggle bit and prepare for next.
• Set STATUS to READY.
UDC finishes normally by above transaction. FIFO can receive next data.
If a time out occurs 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 the same except for STATUS changes.
92CH21-251
TMP92CH21
2009-06-19