DocID024597 Rev 3 1539/1693
RM0351 USB on-the-go full-speed (OTG_FS)
1644
Device mode:
43.15.9 OTG Receive FIFO size register (OTG_GRXFSIZ)
Address offset: 0x024
Reset value: 0x0000 0200
The application can program the RAM size that must be allocated to the Rx FIFO.
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Res. Res. Res. Res. Res. Res. Res. FRMNUM PKTSTS DPID
rrrrrrrrr
1514131211109876543210
DPID BCNT EPNUM
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Bits 31:25 Reserved, must be kept at reset value.
Bits 24:21 FRMNUM: Frame number
This is the least significant 4 bits of the frame number in which the packet is received on the
USB. This field is supported only when isochronous OUT endpoints are supported.
Bits 20:17 PKTSTS: Packet status
Indicates the status of the received packet
0001: Global OUT NAK (triggers an interrupt)
0010: OUT data packet received
0011: OUT transfer completed (triggers an interrupt)
0100: SETUP transaction completed (triggers an interrupt)
0110: SETUP data packet received
Others: Reserved
Bits 16:15 DPID: Data PID
Indicates the Data PID of the received OUT data packet
00: DATA0
10: DATA1
Bits 14:4 BCNT: Byte count
Indicates the byte count of the received data packet.
Bits 3:0 EPNUM: Endpoint number
Indicates the endpoint number to which the current received packet belongs.
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Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
1514131211109876543210
RXFD
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