ST STM32F412

USB on-the-go full-speed (OTG_FS) RM0402
1088/1163 RM0402 Rev 6
Figure 348. Normal interrupt IN
1. The grayed elements are not relevant in the context of this figure.
• Isochronous OUT transactions
A typical isochronous OUT operation is shown in Figure 348. The assumptions are:
– The application is attempting to send one packet every frame (up to 1 maximum
ai15676b
Host
Application
DeviceAHB
O
U
T
T
T
D
A
T
A
0
M
P
S
1
M
PS
1
M
P
S
write
_
tx
_
fifo
(
ch_1
)
i
nit_re
g(
ch_1
)
set_ch_en
(ch_2)
init_reg(ch_2)
write
_
tx
_f
i
f
o
(
ch_1
)
O
U
T
D
A
A
T
A
A
1
M
P
S
X
X
f
f
e
e
r
r
C
C
o
o
m
m
p
p
l
l
i
i
n
n
t
t
e
e
r
r
r
r
u
u
p
p
t
t
t
t
Periodic Request Queue
Assume that this queue
can hold 4 entries.
1
5
D
A
T
A
0
RxFLvl interrupt
1
MPS
read_rx_sts
read_rx_fifo
RxFLvl interrupt
read_rx_sts
XferCompl interrupt
1
2
3
4
4
6
6
2
3
6
7
8
9
Odd
(micro)
frame
Even
(micro)
frame
i
nit_re
g(
ch_1
)
set_ch_en
(ch_2)
init_reg(ch_2)
write
_
tx
_
fifo
(
ch_1
)
i
nit_re
g(
ch_1
)
X
f
f
f
e
r
r
r
C
o
m
p
l
i
n
t
e
r
r
r
r
u
p
t
1
M
P
S
D
A
T
A
1
5
4
A
C
K
K
K
A
A
A
A
A
C
K
ch_1
ch 1
ch_2
ch_2
ch_1
ch 1
USB
IN
ACK
IN