ST STM32L4x6 Reference Manual page 1540

USB on-the-go full-speed (OTG_FS)
Bits 31:16 Reserved, must be kept at reset value.
Bits 15:0 RXFD: Rx FIFO depth
43.15.10 OTG Host non-periodic transmit FIFO size register
(OTG_HNPTXFSIZ)/Endpoint 0 Transmit FIFO size
(OTG_DIEPTXF0)
Address offset: 0x028
Reset value: 0x0200 0200
31 30 29
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15 14 13
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Host mode
Bits 31:16 NPTXFD: Non-periodic Tx FIFO depth
This value is in terms of 32-bit words.
Minimum value is 16
Programmed values must respect the available FIFO memory allocation and must not
exceed the power-on value.
Bits 15:0 NPTXFSA: Non-periodic transmit RAM start address
This field configures the memory start address for non-periodic transmit FIFO RAM.
Device mode
Bits 31:16 TX0FD: Endpoint 0 Tx FIFO depth
This value is in terms of 32-bit words.
Minimum value is 16
Programmed values must respect the available FIFO memory allocation and must not
exceed the power-on value.
Bits 15:0 TX0FSA: Endpoint 0 transmit RAM start address
This field configures the memory start address for the endpoint 0 transmit FIFO RAM.
1540/1693
This value is in terms of 32-bit words.
Minimum value is 16
Programmed values must respect the available FIFO memory allocation and must not
exceed the power-on value.
28 27 26 25
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12 11 10 9
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DocID024597 Rev 3
24 23 22
NPTXFD/TX0FD
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8 7 6
NPTXFSA/TX0FSA
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21 20 19 18
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5 4 3 2
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RM0351
17 16
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1 0
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