GigaDevice Semiconductor GD32VF103 User Manual page 531

28:20 Reserved
19 PCNT
18:7 Reserved
6:0 TLEN[6:0]
Device IN endpoint-x transfer length register (USBFS_DIEPxLEN) (x = 1..3,
where x = endpoint_number)
Address offset: 0x910 + (endpoint_number × 0x20)
Reset value: 0x0000 0000
This register has to be accessed by word (32-bit)
31 30 29
rw
15 14 13
Bits Fields
31 Reserved
30:29 MCPF[1:0]
11: 3 packets
Must be kept at reset value
Packet count
The number of data packets desired to receive in a transfer.
Program this field before the endpoint is enabled. After the transfer starts, this field
is decreased automatically by USBFS after each successful data packet reception
on bus.
Must be kept at reset value
Transfer length
The total data bytes number of a transfer.
This field is the total data bytes of all the data packets desired to receive in an OUT
transfer. Program this field before the endpoint is enabled. Each time software reads
out a packet from the Rx FIFO, this field is decreased by the byte size of the packet.
28 27 26 25
12 11 10 9
Descriptions
Must be kept at reset value
Multi packet count per frame
This field indicates the packet count that must be transmitted per frame for periodic
IN endpoints on the USB. It is used to calculate the data PID for isochronous IN
endpoints by the core.
01: 1 packet
GD32VF103 User Manual
24 23 22 21
rw
8 7 6 5
rw
20 19 18 17
rw
4 3 2 1
16
0
531