User's Manual

Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
September 2006 DM
Order Number: 252480-006US 493
Universal Serial Bus (USB) v1.1 Device Controller—Intel
®
IXP42X product line and IXC1100
control plane processors
18.5.7 UDC Endpoint 5 Control/Status Register (UDCCS5)
The UDC Endpoint 5 Control Status Register contains six bits that are used to operate
endpoint 5, an Interrupt IN endpoint.
18.5.7.1 Transmit FIFO Service (TFS)
The transmit FIFO service bit is set if the FIFO does not contain any data bytes and
UDCCS5[TSP] is not set.
18.5.7.2 Transmit Packet Complete (TPC)
The transmit packet complete bit is be set by the UDC when an entire packet is sent to
the host. When this bit is set, the IR5 bit in the appropriate UDC status/interrupt
register is set if transmit interrupts are enabled.
Register Name: UDCCS4
Hex Offset Address: 0x C800B020 Reset Hex Value: 0x00000000
Register
Description:
Universal Serial Bus Device Controller Endpoint 4 Control and Status Register
Access: Read/Write
Bits
31 876543210
(Reserved)
RSP
RNE
(Rsvd) (Rsvd) (Rsvd)
ROF
RPC
RFS
X 00000000
Resets (Above)
Register
UDCCS4
Bits Name Description
31:8 Reserved for future use.
7RSP
Receive short packet (read only).
1 = Short packet received and ready for reading.
6RNE
Receive FIFO not empty (read-only).
0 = Receive FIFO empty.
1 = Receive FIFO not empty.
5 (Reserved). Always reads 0.
4 (Reserved). Always reads 0.
3(Reserved)
2ROF
Receive overflow (read/write 1 to clear).
1 = Isochronous data packets are being dropped from the host because the
receiver is full.
1RPC
Receive packet complete (read/write 1 to clear).
0 = Error/status bits invalid.
1 = Receive packet has been received and error/status bits are valid.
0RFS
Receive FIFO service (read-only).
0 = Receive FIFO has less than 1 data packet.
1 = Receive FIFO has 1 or more data packets.