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USB Device Controller
Figure 36.
Write Isochronous TX FIFO Data Flowchart
ISO TX handler
STAT_FLG.
MISS_IN
= 1 ?
No
Set Loop_count to TX
ISO packet length
(max is endpoint size).
Loop count = 0?
Yes
Update application
TX buffer count.
End of TX ISO handler
3.26
Summary of USB Device Controller Interrupts
176
Universal Serial Bus (USB)
Yes
Wish to resend
missed data?
Clear both foreground and
No
Read byte from
No
application's TX
buffer.
Table 56 lists the interrupt types by endpoint types.
When a Missed_in occurs, missed
data are from TWO frames previous).
Set
Yes
CTRL.CIR_EP to
clear the current
FIFO.
background TX FIFO.
Must put missed transmit data
into foreground ISO TX FIFO.
Write byte to TX
FIFO (via DATA
register).
Application-
specific actions
to handle
missed in data
(Reload TX byte
count...).
Increment TX byte
count, decrement
loop count.
SPRU761A
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