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data bypass
The Data Bypass Buffer is another important aspect of the Memory Accelerator Module. The ARM7 is a Von Neumann architecture, but it provides a signal that specifies whether the cycle is an opcode or a data fetch. In other words, you know whether your 32-bit instruction coming out of memory is actually an instruction or a data word. Then, this signal is used by the Memory Accelerator Module to store the 128 bits into the Data Bypass Buffer whenever a data read is accessed from Flash. If it is an instruction access, then it goes into the Pre Fetch Buffer. Then, subsequent data requests are satisfied from the Data Bypass Buffer if the next requested data is sequential to the previously fetched data.
PTM Published on: 2011-11-02