ST STM32L4x6 Reference Manual page 1559

RM0351
Bits 21:20 MCNT: Multicount
Note: This field must be set to at least 01.
Bits 19:18 EPTYP: Endpoint type
Bit 17 LSDEV: Low-speed device
Bit 16 Reserved, must be kept at reset value.
Bit 15 EPDIR: Endpoint direction
Bits 14:11 EPNUM: Endpoint number
Bits 10:0 MPSIZ: Maximum packet size
This field indicates to the host the number of transactions that must be executed per frame
for this periodic endpoint. For non-periodic transfers, this field is not used
00: Reserved. This field yields undefined results
01: 1 transaction
10: 2 transactions per frame to be issued for this endpoint
11: 3 transactions per frame to be issued for this endpoint
Indicates the transfer type selected.
00: Control
01: Isochronous
10: Bulk
11: Interrupt
This field is set by the application to indicate that this channel is communicating to a low-
speed device.
Indicates whether the transaction is IN or OUT.
0: OUT
1: IN
Indicates the endpoint number on the device serving as the data source or sink.
Indicates the maximum packet size of the associated endpoint.
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USB on-the-go full-speed (OTG_FS)
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