Overview
MSC8144E Reference Manual, Rev. 3
Freescale Semiconductor
17-3
Single-write start mode. The DMA process can be started by using a single-write
command to either the descriptor address register in one of the chaining modes or the
source/destination address registers in one of the direct modes.
External control capability. This allows an external agent to start, pause, and check the
status of a DMA transfer that has already been initialized.
Channel continue capability. The channel continue capability allows software the
flexibility of having the DMA controller start with descriptors that have already been
programmed while software continues to build more descriptors in memory.
Channel abort capability. The software can abort a previously initiated transfer by setting
the bit MRn[CA]. The DMA controller terminates all outstanding transfers initiated by the
channel without generating any errors before entering an idle state.
(
Refer to Section 17.2, Functional Description for details on these modes. Figure 17-2 shows the general
DMA operational flow chart.
Figure 17-2. DMA Operational Flow Chart
Table 17-1. Relationship of Modes and Features
Mode
Mode with One Additional Feature
Mode with Two Additional Features
B (Basic)
BD (basic direct)
BDS (BD single-write start)
BC (basic chaining)
BCS (BC single-write start)
Ext (Extended)
ExtD (extended direct)
ExtDS (ExtD single-write start)
ExtC (extended chaining)
ExtCS (ExtC single-write start)
Software Sets 1st Link
Process Link
Last Link?
Is
N
Y
N
Chain or Extended
Done — DMA Halts
Y
Is
Last List?
N
Y
Advance List
Advance
Mode?
In
Link
Содержание MSC8144E
Страница 1: ...MSC8144E Reference Manual Quad Core Media Signal Processor MSC8144ERM Rev 3 July 2009 ...
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Страница 86: ...MSC8144E Reference Manual Rev 3 1 38 Freescale Semiconductor Overview ...
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Страница 168: ...MSC8144E Reference Manual Rev 3 3 60 Freescale Semiconductor External Signals ...
Страница 242: ...MSC8144E Reference Manual Rev 3 5 26 Freescale Semiconductor Reset ...
Страница 314: ...MSC8144E Reference Manual Rev 3 8 24 Freescale Semiconductor General Configuration Registers ...
Страница 414: ...MSC8144E Reference Manual Rev 3 10 14 Freescale Semiconductor MSC8144E SC3400 DSP Subsystem ...
Страница 452: ...MSC8144E Reference Manual Rev 3 11 38 Freescale Semiconductor Internal Memory Subsystem ...
Страница 520: ...MSC8144E Reference Manual Rev 3 12 68 Freescale Semiconductor DDR SDRAM Memory Controller ...
Страница 884: ...MSC8144E Reference Manual Rev 3 17 44 Freescale Semiconductor RapidIO Interface Dedicated DMA Controller ...
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