Physical Ports - Texas Instruments OMAP5912 Reference Manual

3.1.4

Physical Ports

Table 18. OMAP3.2 System DMA Supported Interface Port Type Table
Port _Name
OMAP EMIFF port
OMAP EMIFS port
OMAP OCP-T1 port
OMAP OCP-T2 port
OMAP TIPB port
OMAP MPUI port
OMAP LCD port
OMAP TIPB configuration port
SPRU755B
To configure an LCh to transfer one block per DMA request:
-
1) Configure the element size as described above.
2) Configure the element number as described above. This represents
the number of elements sent per frame.
3) Configure the frame number as described above. This represents the
number of frames sent per block.
4) Configure FS to 0 and BS to 1.
It is also possible to stop a transfer by disabling the channel. This is done by
resetting the ENABLE bit in the DMA_CCR register.
The system DMA can access different data types, depending on which DMA
port is used and what the memory or peripheral is supporting. The system
DMA ports can support different types of protocols and bus widths. This is
important to understand, because it governs which type of transfer an LCh can
perform. Table 18 summarizes the type of transfers that each port supports.
Port Functionality
Supports: pp
8/16/32-bit, 4x32-bit burst serialized access 8/16/32 bit, 4x32 bit burst serialized access
- -
4x32-bit burst serialized access, if it is the source port of the LCD 4x32 bit burst serialized access, if it is the source port of the LCD
- -
channel.
Supports: pp
8/16/32-bit serialized access
-
Supports:
16-bit serialized access for OMAP LCD controller
-
32-bit serialized access for OMAP external LCD controller
-
TIPB configuration interface for system DMA. It supports 16-bit serialized
access.
Six of the physical ports can be selected to be the source and/or destination
of a DMA transfer. The DMA LCD port can only function as a destination port.
The TIPB configuration port cannot be used as a source or destination port.
Direct Memory Access (DMA) Support
System DMA
35