EFM32WG Datasheet, PDF (394/834 Pages) List of Unclassifed Manufacturers – The EFM32WG Wonder Gecko is the ideal choice for demanding 8-, 16-, and 32-bit energy sensitive applications.

...the world's most energy friendly microcontrollers
Bit
Name
Reset
Access Description
18:0
XFERSIZE
0x00000
RW
Transfer Size
Indicates the transfer size in bytes. The core interrupts the application only after it has exhausted the transfer size amount of data.
The transfer size can be set to the maximum packet size of the endpoint, to be interrupted at the end of each packet. The core
decrements this field every time a packet from the external memory is written to the TxFIFO.
15.6.58 USB_DIEPx_DMAADDR - Device IN Endpoint x+1 DMA Address
Register
Offset
0x3C934
Bit Position
Reset
Access
Name
Bit
Name
Reset
Access Description
31:0
DMAADDR
0xXXXXXXXX RW
DMA Address
Holds the start address of the external memory for fetching endpoint data. For control endpoints, this field stores control OUT data
packets as well as SETUP transaction data packets. When more than three SETUP packets are received back-to-back, the SETUP
data packet in the memory is overwritten. This register is incremented on every AHB transaction. The application can give only a
DWORD-aligned address. The data for this register field is stored in RAM. Thus, the reset value is undefined (X).
15.6.59 USB_DIEPx_TXFSTS - Device IN Endpoint x+1 Transmit FIFO
Status Register
This read-only register contains the free space information for the Device IN endpoint TxFIFO.
Offset
0x3C938
Bit Position
Reset
Access
Name
Bit
31:16
15:0
Name
Reset
Access Description
Reserved
To ensure compatibility with future devices, always write bits to 0. More information in Section 2.1 (p. 3)
SPCAVAIL
0x0200
R
TxFIFO Space Available
Indicates the amount of free space available in the Endpoint TxFIFO. Values are in terms of 32-bit words.
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
394
www.energymicro.com