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Intel® PXA26x Processor Family Developer’s Manual 12-35

Universal Serial Bus Device Controller

12.6.7 UDC Endpoint x Control/Status Register (UDCCSx), Where

x is 5, 10, or 15.

The UDC endpoint(x) control status register contains 6 bits that operate endpoint(x), an interrupt

IN endpoint.

12.6.7.1 Transmit FIFO Service (TFS)

The transmit FIFO service bit is set if the FIFO does not contain any data bytes and UDCCSx[TSP]

is not set.

Table 12-17. UDC Endpoint x Control Status Register, Where x is 4, 9, or 14

0h 4060 0020 UDCCS4 Read/Write

0h 4060 0034 UDCCS9 Read/Write

0h 4060 0048 UDCCS14 Read/Write

Bit

31:8 7 6 5 4 3 2 1 0

Reserved RSP RNE Reserved Reserved DME ROF RPC RFS

Rese

X 0 0 0 0 0 0 0 0

Bits Name Description

0RFS

RECEIVE FIFO SERVICE (read-only):

0 – Receive FIFO has less than 1 data packet.

1 – Receive FIFO has 1 or more data packets.

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.

2ROF

RECEIVE OVERFLOW (read/write 1 to clear):

1 – Isochronous data packets are being dropped from the host because

the receiver is full.

3DME

DMA ENABLE (read/write):

0 – Send receive interrupt after EOP receive

1 – Send data received interrupt after EOP received and receive FIFO

has < 32 bytes of data

4—

Reserved

Always reads 0.

5—

Reserved

Always reads 0.

6 RNE

RECEIVE FIFO NOT EMPTY (read-only):

0 – Receive FIFO empty.

1 – Receive FIFO not empty.

7RSP

RECEIVE SHORT PACKET (read-only):

1 – Short packet received and ready for reading.

31:8 Reserved Reserved for future use

1 2 ... 440 441 442 443 444 445 446 447 448 449 450 ... 623 624

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