Texas Instruments OMAP5912 Reference Manual page 688

System DMA
Table 26. Summary Table of Different Compatibility Modes
Global Register Bit
OMAP3_1_Map-
Global Effects
ping_Disable
0
-
-
-
-
-
1
-
-
-
-
Note: The LCh compatibility bit, OMAP3_1_compatible_disable, is configured per logical channel, so it is possible to mix the
programmer model for different logical channels.
64 Direct Memory Access (DMA) Support
To enable the new features introduced beyond OMAP 3.1, the following
configuration register bits must be configured:
OMAP 3_1_MAPPING_DISABLE in register DMA_GSCR
-
OMAP3_1_COMPATIBLE_DISABLE in register
-
DMA_CCR/DMA_LCD_CCR
LCh register bit that enables/disables the OMAP 3.2 programming model.
-
LCh Register Bit
OMAP3_1com-
patible_disable
Reset values
9 LCh + 1 LCh-D
available
OMAP 3.1 configu-
ration register map ration register map-
ping
OMAP 3.1 interrupt
line mapping
7 interrupt lines
16LCh + 1 LCh-D
available
OMAP3.2 configu-
ration register map-
ping
OMAP3.2 interrupt
line mapping
17 interrupt lines
OMAP 3_1_MAPPING_DISABLE bit in register DMA_GSCR is a global
The
register bit that enables/disables OMAP 3.1 register mapping and interrupt line
mapping. DMA_GSCR is a global register and must therefore be configured
before any LCh is enabled. The DMA_CCR/DMA_LCD_CCR registers are
configured per LCh, which enables having different programming models for
the LChs. The register and interrupt line mapping must be configured first and
affect all the LChs, but the OMAP 3.0/3.1 and OMAP 3.2 programming
models, respectively, can be mixed among the LChs.
Per-LCH Effects
0 Only OMAP 3.1 programming
model/feature set is supported.
PCh-2 cannot be used, so only the LCD
channel and two generic logical physical
channels are available to these LChs.
1 All features are available as described in
the remainder of this document.
All four physical channels are available
to these LChs.
0 Only OMAP 3.1 .programming
model/feature set is supported.
PCh-2 cannot be used, so only the LCD
channel and two generic physical
channels are available to these LChs.
1 All features are available as earlier
described in this document.
All four physical channels are available
to these LChs.
SPRU755B