Service Chain - Texas Instruments OMAP5910 Reference Manual

DSP DMA
Figure 72. MPUI Access Configurations
Port read/write
MPUI
Port read/write
MPUI
7.2.6

Service Chain

132 DSP Subsystem
MPUI EXCL = 0
requests
DARAM port
SARAM port
External memory port
Peripheral port
MPUI EXCL = 1
requests
DARAM port
SARAM port
External memory port
Peripheral port
Each of the standard ports can arbitrate simultaneous access requests sent
by the six DMA channels and the Microprocessor Unit Interface (MPUI). Each
of the standard ports has an independently functioning service chain, which
is a software and hardware controlled scheme for servicing access requests.
Although the four service chains function independently, they share a common
configuration. For example, if channel 2 is disabled, it is disabled in all four
ports, and if channel 4 is made a high priority, it is high priority in all four of the
ports. One possible configuration for the service chains is shown in Figure 73.
Important characteristics of the service chain are listed after the figure.
Port read/write
requests
DMA channels
Port read/write
requests
DMA channels
SPRU890A