Datasheet

SOF_WR Register
Description
Set the SOF (Start of Frame) frame number in the host controller. The SOF packet is sent every 1ms and the host will
increment the frame number by 1 each time.
Table 394. SOF_WR
Register
Bits Name Description Type Reset
31:11 Reserved. - - -
10:0 COUNT WF 0x000
SOF_RD Register
Description
Read the last SOF (Start of Frame) frame number seen. In device mode the last SOF received from the host. In host
mode the last SOF sent by the host.
Table 395. SOF_RD
Register
Bits Name Description Type Reset
31:11 Reserved. - - -
10:0 COUNT RO 0x000
SIE_CTRL Register
Description
SIE control register
Table 396. SIE_CTRL
Register
Bits Name Description Type Reset
31 EP0_INT_STALL Device: Set bit in EP_STATUS_STALL_NAK when EP0 sends
a STALL
RW 0x0
30 EP0_DOUBLE_BUF Device: EP0 single buffered = 0, double buffered = 1 RW 0x0
29 EP0_INT_1BUF Device: Set bit in BUFF_STATUS for every buffer completed
on EP0
RW 0x0
28 EP0_INT_2BUF Device: Set bit in BUFF_STATUS for every 2 buffers
completed on EP0
RW 0x0
27 EP0_INT_NAK Device: Set bit in EP_STATUS_STALL_NAK when EP0 sends
a NAK
RW 0x0
26 DIRECT_EN Direct bus drive enable RW 0x0
25 DIRECT_DP Direct control of DP RW 0x0
24 DIRECT_DM Direct control of DM RW 0x0
23:19 Reserved. - - -
18 TRANSCEIVER_PD Power down bus transceiver RW 0x0
17 RPU_OPT Device: Pull-up strength (0=1K2, 1=2k3) RW 0x0
16 PULLUP_EN Device: Enable pull up resistor RW 0x0
15 PULLDOWN_EN Host: Enable pull down resistors RW 0x0
14 Reserved. - - -
13 RESET_BUS Host: Reset bus SC 0x0
RP2040 Datasheet
4.1. USB 398