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Figure 15.18. Normal Isochronous OUT/IN Transactions in DMA Mode
init_reg( ch_2)
Applicat ion
1
i n i t_r e g(c h_1)
1
AHB
1
MPS
5
i n i t_r e g(c h_1)
CHHLTD int errupt
1
MPS
H ost
2
ch_1
3
ch_2
2
4
3
USB
Periodic Request
Queue
Assum e that this
queue can hold
4 ent rie.s
D e v ice
OUT
DATA0
M PS
IN
DATA0
Odd
fram e
1
MPS
init_reg( ch_2)
5
CHHLTD int errupt
4
ch_1
ch_2
i n i t_r e g(c h_1)
CHHLTD int errupt
1
MPS
OUT
DATA0
M PS
IN
DATA0
Ev e n
fram e
Interrupt Service Routine for Isochronous OUT Transactions in DMA Mode
Isochronous OUT
Unmask (CHHLTD)
if (CHHLTD)
{
if (XFERCOMPL or FRMOVRUN)
{
De-allocate Channel
}
}
15.4.3.6.16 Isochronous IN Transactions in DMA Mode
To initialize the core after power-on reset, the application must follow the sequence in Overview:
Programming the Core (p. 246) . Before it can communicate with the connected device, it must initialize
a channel as described in Channel Initialization (p. 252) .
2013-05-08 - Wonder Gecko Family - d0233_Rev0.50
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