摘要:
In one embodiment, a digital signal processor includes look ahead logic to decrease the number of bubbles inserted in the processing pipeline. The processor receives data containing instructions in a plurality of buffers and decodes the size of a first instruction. The beginning of a second instruction is determined based on the size of the first instruction. The size of the second instruction is decoded and the processor determines whether loading the second instruction will deplete one of the plurality of buffers.
摘要:
In one embodiment, a digital signal processor includes look ahead logic to decrease the number of bubbles inserted in the processing pipeline. The processor receives data containing instructions in a plurality of buffers and decodes the size of a first instruction. The beginning of a second instruction is determined based on the size of the first instruction. The size of the second instruction is decoded and the processor determines whether loading the second instruction will deplete one of the plurality of buffers.
摘要:
A programmable processor is adapted to detect exception conditions associated with one or more instructions before the instructions are executed. The detected exception conditions may be stored with the one or more instructions in a prefetch unit. Then, the exception conditions may be issued in parallel with the issuance of the instructions.
摘要:
A programmable processor is adapted to detect exception conditions associated with one or more instructions before the instructions are executed. The detected exception conditions may be stored with the one or more instructions in a prefetch unit. Then, the exception conditions may be issued in parallel with the issuance of the instructions.
摘要:
In one embodiment, a method is disclosed for holding instruction fetch requests of a processor in an extended reset. Fetch requests are disabled when the processor undergoes a reset. When the reset is completed, fetch requests remain disabled when the instruction memory is being loaded. When loading of the instruction memory is completed, fetch requests are enabled.
摘要:
The inputs to an embedded core, e.g., the core terminals, may not be directly connected to pins on the SoC. The lack of direct access to an embedded core's terminals may complicate testing of the embedded core. A test wrapper including boundary scan test (BST) cells may be used to test an embedded core. Dual function BST/ATPG (Automatic Test Pattern Generation) cells may be used to perform both BST and ATPG tests on embedded cores.
摘要:
Testing memory devices. An apparatus may include a test module operative to perform a test on a plurality of pipelined memory elements and a fail trace module operative to interrupt the test in response to identifying a failure of a memory element and to store an address of said memory element in a storage unit.
摘要:
A highly parallel data processing system includes an array of n processing elements (PEs) and a controller sequence processor (SP) wherein at least one PE is combined with the controller SP to create a Dynamic Merged Processor (DP) which supports two modes of operation. In its first mode of operation, the DP acts as one of the PEs in the array and participates in the execution of single-instruction-multiple-data (SIMD) instructions. In the second mode of operation, the DP acts as the controlling element for the array of PEs and executes non-array instructions. To support these two modes of operation, the DP includes a plurality of execution units and two general-purpose register files. The execution units are “shared” in that they can execute instructions in either mode of operation. With very long instruction word (VLIW) capability, both modes of operation can be in effect on a cycle by cycle basis for every VLIW executed. This structure allows the controlling element in a highly parallel SIMD processor to be reused as one of the processing elements in the array to reduce the overall number of transistors and wires in the SIMD processor while maintaining its capabilities and performance.
摘要:
In one implementation, a programmable processor is adapted to include a first set of registers and a second set of registers. The first set of registers may have a future file, and the second set of registers may be architectural registers. Following a termination of an instruction in the processor, the future file may be restored with values in the second set of registers. The future file is restored over more than one clock cycle.
摘要:
A data processing system (10 or 28) and method uses a memory management unit (MMU 14). The processor has two privileged modes of operations, such as a user mode and a supervisor mode of operation. The MMU 14 has a first mode of operation wherein logical address translation is performed via cache accesses and tablewalks, and a second mode of operation. The second mode of operation involves providing translation attribute bits from one of either a first transparent translation register (TTR 16), a second transparent translation register (TTR 18), or a default location (22). The TTRs (16 and 18) can each map different address spaces and different addressed memory sizes and the default location (22) covers all memory that is not mapped by one of the TTRs (16 or 18). The default location (22) is programmable, provides write protection, and provides attribute bits independent from the privilege mode.