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Intel® PXA26x Processor Family Developer’s Manual 12-37
Universal Serial Bus Device Controller
12.6.7.8 Transmit Short Packet (TSP)
Software uses the transmit short to indicate that the last byte of a data transfer has been sent to the
FIFO. This indicates to the UDC that a short packet or zero-sized packet is ready to transmit.
Software must not set this bit if a packet of 8 bytes is to be transmitted. When the data packet is
successfully transmitted, the UDC clears this bit.
12.6.8 UDC Interrupt Control Register 0 (UICR0)
The UICR0 contains 8 control bits to enable/disable interrupt service requests from data endpoints
0 - 7. All of the UICR0 bits are reset to a 1 so interrupts are not generated on initial system reset.
Table 12-18. UDC Endpoint x Control Status Register, Where x is 5, 10, or 15
0h 4060 0024 UDCCS5 Read/Write
0h 4060 0038 UDCCS10 Read/Write
0h 4060 004C UDCCS15 Read/Write
Bit
31:8 7 6 5 4 3 2 1 0
Reserved TSP Reserved FST SST TUR FTF TPC TFS
Rese
t
X 0 0 0 0 0 0 0 1
Bits Name Description
0 TFS
TRANSMIT FIFO SERVICE (read-only):
0 – Transmit FIFO has no room for new data
1 – Transmit FIFO has room for 1 complete data packet
1TPC
TRANSMIT PACKET COMPLETE (read/write 1 to clear):
0 – Error/status bits invalid.
1 – Transmit packet has been sent and error/status bits are valid.
2FTF
FLUSH Tx FIFO (always read 0/ write a 1 to set):
1 – Flush Contents of TX FIFO
3TUR
TRANSMIT FIFO UNDERRUN (read/write 1 to clear):
1 – Transmit FIFO experienced an underrun.
4SST
SENT STALL (read/write 1 to clear):
1 – STALL handshake was sent.
5FST
FORCE STALL (read/write):
1 – Issue STALL handshakes to IN tokens.
6—
Reserved
Always reads 0
7TSP
TRANSMIT SHORT PACKET (read/write 1 to set):
1 – Short packet ready for transmission.
31:8 — Reserved for future Use