Omap 3.2 System Dma Instances - Texas Instruments OMAP5912 Reference Manual

System DMA
Table 16. Summary of Features Per Logical Channel Type (Without LCh-D)
Supported Transfer Features
LCh Control Transfer type
Synchronized
-
Two levels of priority
Preemption at element boundary
LCh interleaving on DMA request
Linking logical channel capability
Addressing g
Types of addressing modes for SRC and DST
Constant mode
-
Post-increment mode
-
Single-indexed mode with separate
-
SRC/DST index
Double-indexed mode with separate
-
SRC/DST index
Other Other LCh-type features
Constant fill
Transparent color
Supported only on one end of the transfer (memory side—can be a source or a destination).
Note:
3.1.2

OMAP 3.2 System DMA Instances

32 Direct Memory Access (DMA) Support
A separate table applies for the LCh-D (D), because several elements differ
between that channel and these generic LChs. See Table 29, Features
Summary for LCh-D, in section 3.2.1.
The abbreviations in parentheses in the Table 16 headings are used
throughout this document as a guide to features supported for different LCh
types.
The OMAP 3.2 system DMA has 16 generic logical channels plus one logical
channel dedicated to the LCD controller as well as three physical channels
plus one dedicated to the LCD controller (PCh-0, PCh-1, PCh-2 plus PCh-D).
PCh-0 and PCh-1 are always dynamically allocated to any active LCh of type
LCh-2D, LCh-G, and LCh-P. Dynamic allocation means that the physical
channel that becomes free first services the active logical channel. PCh-2 is
different from PCh-0 and PCh-1, because it is possible to configure one or
several synchronized LChs to only use this physical channel. For example, the
physical channel can be dedicated to one LCh or to several interleaved
synchronized channels. This is done by specifying an LCh as LCh-PD type.
LCh-2D LCh-P LCh-PD
(2D) (P)
√ √
√ √
√ √
√
√ √
√ √
√ √
√ See Note See Note
√ See Note See Note
√
LCh-G
(PD) (G)
√ √
√ √
√
√
√ √
√ √
√ √
√
√
√
√
SPRU755B