NPTxQTop=value1, NPTxQSpcAvail=value1, NPTxFSpcAvail=value1
Non-Periodic Transmit FIFO/Queue Status Register
| NPTxFSpcAvail | Non-periodic TxFIFO Space Avail 0 (value1): Non-periodic TxFIFO is full 1 (value2): 1 word available 2 (value3): 2 words available |
| NPTxQSpcAvail | Non-periodic Transmit Request Queue Space Available 0 (value1): Non-periodic Transmit Request Queue is full 1 (value2): 1 location available 2 (value3): 2 locations available |
| NPTxQTop | Top of the Non-periodic Transmit Request Queue 0 (value1): IN/OUT token 1 (value2): Zero-length transmit packet (device IN/host OUT) 3 (value4): Channel halt command |