Freescale Semiconductor MSC8156 Evaluation Module MSC8156EVM MSC8156EVM Benutzerhandbuch
Produktcode
MSC8156EVM
MSC8156 Reference Manual, Rev. 2
14-30
Freescale Semiconductor
Direct Memory Access (DMA) Controller
—
26
0
Reserved. Write to zero for future compatibility.
SRCBDPT
25–16
0
Source Buffer Pointer
BD number in the BD table assigned to the source.
The maximum number of one-dimensional BDs per source
is 1024, and the maximum number of multi-dimensional
BDs per source is 512. For details on BD address
calculation, see Section 14.7.22, DMA Channel Buffer
Descriptors, on page 14-45.
Written by: User, DMA controller
BD number in the BD table assigned to the source.
The maximum number of one-dimensional BDs per source
is 1024, and the maximum number of multi-dimensional
BDs per source is 512. For details on BD address
calculation, see Section 14.7.22, DMA Channel Buffer
Descriptors, on page 14-45.
Written by: User, DMA controller
RRPG
15–13
0
Channel Round-Robin Priority Group
This field is valid only for round robin arbitration.See Table
14-17 for selecting arbitration mode. For more details about
round robin, see 14.3.1, Round-Robin Arbitration. To update
this field while the channel is active, use the
DMA_RRPGUR register (see page 14-44)
Written by: User, DMA controller
This field is valid only for round robin arbitration.See Table
14-17 for selecting arbitration mode. For more details about
round robin, see 14.3.1, Round-Robin Arbitration. To update
this field while the channel is active, use the
DMA_RRPGUR register (see page 14-44)
Written by: User, DMA controller
000
Highest priority.
011
Lowest priority.
1xx
Reserved.
—
12
0
Reserved. Write to zero for future compatibility.
DPO
11
0
Destination Port Optimize
Specifies how the destination port is to be optimized.
Written by: User
Specifies how the destination port is to be optimized.
Written by: User
0
Optimize for destination port
requests latency.
requests latency.
1
Optimize for destination port
requests utilization.
requests utilization.
—
10
0
Reserved. Write to zero for future compatibility.
DESBDPT
9-0
0
Destination Buffer Pointer
BD number in the BD table assigned to the destination.
The maximum number of one-dimensional BDs per
destination is 1024. The maximum number of
multi-dimensional BDs per destination is 512.
For details on BD address calculation, see Section 14.7.22.
Written by: User, DMA controller
BD number in the BD table assigned to the destination.
The maximum number of one-dimensional BDs per
destination is 1024. The maximum number of
multi-dimensional BDs per destination is 512.
For details on BD address calculation, see Section 14.7.22.
Written by: User, DMA controller
Table 14-16. DMACHCRx Field Descriptions (Continued)
Bits
Reset
Description
Settings