TMS320C6678
Multicore Fixed and Floating-Point Digital Signal Processor
SPRS691D—April 2013
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5.3 Bandwidth Management
When multiple requestors contend for a single C66x CorePac resource, the conflict is resolved by granting access to
the highest priority requestor. The following four resources are managed by the Bandwidth Management control
hardware:
•
•
•
•
Level 1 Program (L1P) SRAM/Cache
Level 1 Data (L1D) SRAM/Cache
Level 2 (L2) SRAM/Cache
Memory-mapped registers configuration bus
The priority level for operations initiated within the C66x CorePac are declared through registers in the C66x
CorePac. These operations are:
•
•
•
DSP-initiated transfers
User-programmed cache coherency operations
IDMA-initiated transfers
The priority level for operations initiated outside the C66x CorePac by system peripherals is declared through the
Priority Allocation Register (PRI_ALLOC), see section 4.3 ‘‘Bus Priorities’’ on page 107 for more details. System
peripherals with no fields in the PRI_ALLOC have their own registers to program their priorities.
More information on the bandwidth management features of the C66x CorePac can be found in the C66x CorePac
User Guide in ‘‘Related Documentation from Texas Instruments’’ on page 73.
5.4 Power-Down Control
The C66x CorePac supports the ability to power down various parts of the C66x CorePac. The power down
controller (PDC) of the C66x CorePac can be used to power down L1P, the cache control hardware, the DSP, and
the entire C66x CorePac. These power-down features can be used to design systems for lower overall system power
requirements.
Note—The C6678 does not support power-down modes for the L2 memory at this time.
More information on the power-down features of the C66x CorePac can be found in the TMS320C66x CorePac
Reference Guide in ‘‘Related Documentation from Texas Instruments’’ on page 73.
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C66x CorePac
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