Preliminary
Registers
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20.9.4.2 CPPI DMA Scheduler Table Word N (WORDn)
The Tx channel configuration registers are used to initialize the behavior of each of the Tx DMA
channels. N ranges from 0 to 63. The CPPI DMA scheduler table word N register (WORDn) is shown in
and described in
.
Figure 20-117. CPPI DMA Scheduler Table Word N Register (WORDn)
31
30
29
28
24
23
22
21
20
16
entry3_
entry2_
Reserved
entry3_channel
Reserved
entry2_channel
rxtx
rxtx
W
R
W
W
W
W
15
14
13
12
8
7
6
5
4
0
entry1_
entry0_
Reserved
entry1_channel
Reserved
entry0_channel
rxtx
rxtx
W
W
W
W
W
W
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-131. CPPI DMA Scheduler Table Word N Register (WORDn) Field Descriptions
Bits
Field Name
Value
Description
31
entry3_rxtx
This bit indicates if this entry is for a Tx or an Rx channel and is encoded as
follows:
0
0Tx Channel
1
Rx Channel
30-29
Reserved
0
Reserved
28-24
entry3_channel
This field indicates the channel # that is to be given an opportunity to transfer
data. If this is a Tx entry, the DMA will be presented with a scheduling ‘credit’ for
that exact Tx channel. If this is an Rx entry, the DMA will be presented with a
scheduling credit for the Rx FIFO that is associated with this channel. For Rx
FIFOs which carry traffic for more than 1 Rx DMA channel, the exact channel
number that is given in the Rx credit will actually be the channel number which is
currently on the head element of that Rx FIFO, which is not necessarily the
channel number given in the scheduler table entry.
23
entry2_rxtx
This bit indicates if this entry is for a Tx or an Rx channel and is encoded as
follows:
0
Tx Channel
1
Rx Channel
22-21
Reserved
0
Reserved
20-16
entry2_channel
This field indicates the channel # that is to be given an opportunity to transfer
data. If this is a Tx entry, the DMA will be presented with a scheduling ‘credit’ for
that exact Tx channel. If this is an Rx entry, the DMA will be presented with a
scheduling credit for the Rx FIFO that is associated with this channel. For Rx
FIFOs which carry traffic for more than 1 Rx DMA channel, the exact channel
number that is given in the Rx credit will actually be the channel number which is
currently on the head element of that Rx FIFO, which is not necessarily the
channel number given in the scheduler table entry.
15
entry1_rxtx
This bit indicates if this entry is for a Tx or an Rx channel and is encoded as
follows:
0
Tx Channel
1
Rx Channel
14:-13
Reserved
12-8
entry1_channel
This field indicates the channel # that is to be given an opportunity to transfer
data. If this is a Tx entry, the DMA will be presented with a scheduling ‘credit’ for
that exact Tx channel. If this is an Rx entry, the DMA will be presented with a
scheduling credit for the Rx FIFO that is associated with this channel. For Rx
FIFOs which carry traffic for more than 1 Rx DMA channel, the exact channel
number that is given in the Rx credit will actually be the channel number which is
currently on the head element of that Rx FIFO, which is not necessarily the
channel number given in the scheduler table entry.
1926Universal Serial Bus (USB)
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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