USB on-the-go full-speed (OTG_FS) RM0008
882/1096 Doc ID 13902 Rev 12
OTG_FS device OUT endpoint 0 transfer size register (OTG_FS_DOEPTSIZ0)
Address offset: 0xB10
Reset value: 0x0000 0000
The application must modify this register before enabling endpoint 0. Once endpoint 0 is
enabled using the Endpoint enable bit in the OTG_FS_DOEPCTL0 registers (EPENA bit in
OTG_FS_DOEPCTL0), the core modifies this register. The application can only read this
register once the core has cleared the Endpoint enable bit.
Nonzero endpoints use the registers for endpoints 1–3.
313029282726252423222120191817161514131211109876543210
Reserved
STUPC
NT
Reserved
PKTCNT
Reserved
XFRSIZ
rw rw rw rw rw rw rw rw rw rw
Bit 31 Reserved
Bits 30:29 STUPCNT: SETUP packet count
This field specifies the number of back-to-back SETUP data packets the endpoint can receive.
01: 1 packet
10: 2 packets
11: 3 packets
Bits 28:20 Reserved
Bit 19 PKTCNT: Packet count
This field is decremented to zero after a packet is written into the RxFIFO.
Bits 18:7 Reserved
Bits 6:0 XFRSIZ: Transfer size
Indicates the transfer size in bytes for endpoint 0. 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 is read from the RxFIFO and written to the
external memory.
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