LM3S5762 Datasheet, PDF (657/841 Pages) Texas Instruments – Stellaris® LM3S5762 Microcontroller

Stellaris® LM3S5762 Microcontroller
Register 12: USB FIFO Endpoint 0 (USBFIFO0), offset 0x020
Register 13: USB FIFO Endpoint 1 (USBFIFO1), offset 0x024
Register 14: USB FIFO Endpoint 2 (USBFIFO2), offset 0x028
Register 15: USB FIFO Endpoint 3 (USBFIFO3), offset 0x02C
Important: This register is read-sensitive. See the register description for details.
OTG A /
Host
OTG B /
Device
These 32-bit registers provide an address for CPU access to the FIFOs for each endpoint. Writing
to these addresses loads data into the Transmit FIFO for the corresponding endpoint. Reading from
these addresses unloads data from the Receive FIFO for the corresponding endpoint.
Transfers to and from FIFOs may be 8-bit, 16-bit or 32-bit as required, and any combination of
accesses is allowed provided the data accessed is contiguous. All transfers associated with one
packet must be of the same width so that the data is consistently byte-, halfword- or word-aligned.
However, the last transfer may contain fewer bytes than the previous transfers in order to complete
an odd-byte or odd-word transfer.
Depending on the size of the FIFO and the expected maximum packet size, the FIFOs support
either single-packet or double-packet buffering (see the section called “Single-Packet
Buffering” on page 624). Burst writing of multiple packets is not supported as flags must be set after
each packet is written.
Following a STALL response or a transmit error on endpoint 1–3, the associated FIFO is completely
flushed.
USB FIFO Endpoint 0 (USBFIFO0)
Base 0x4005.0000
Offset 0x020
Type R/W, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
EPDATA
Type R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
EPDATA
Type R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:0
Name
EPDATA
Type
Reset Description
R/W 0x0000.0000 Endpoint Data
Writing to this register loads the data into the Transmit FIFO and reading
unloads data from the Receive FIFO.
November 17, 2011
657
Texas Instruments-Production Data