STM32F101xx, STM32F102xx, STM32F103xx, STM32F105xx and ...

USB on-the-go full-speed (OTG_FS)
RM0008
OTG_FS non-periodic transmit FIFO size register (OTG_FS_GNPTXFSIZ)
Address offset: 0x028
Reset value: 0x0000 0200
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
NPTXFD
r/rw
NPTXFSA
r/rw
Bits 31:16 NPTXFD: Non-periodic TxFIFO depth
This value is in terms of 32-bit words.
Minimum value is 16
Maximum value is 256
Bits 15:0 NPTXFSA: Non-periodic transmit RAM start address
This field contains the memory start address for non-periodic transmit FIFO RAM.
OTG_FS non-periodic transmit FIFO/queue status register
(OTG_FS_GNPTXSTS)
Note:
Address offset: 0x02C
Reset value: 0x0008 0200
In Device mode, this register is not valid.
This read-only register contains the free space information for the non-periodic TxFIFO and
the non-periodic transmit request queue.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
NPTXQTOP NPTQXSAV NPTXFSAV
r r r
Bit 31 Reserved
Bits 30:24 NPTXQTOP: Top of the non-periodic transmit request queue
Entry in the non-periodic Tx request queue that is currently being processed by the MAC.
Bits [30:27]: Channel/endpoint number
Bits [26:25]:
– 00: IN/OUT token
– 01: Zero-length transmit packet (device IN/host OUT)
– 11: Channel halt command
Bit [24]: Terminate (last entry for selected channel/endpoint)
740/995 Doc ID 13902 Rev 9