The TC1766 has two independent on-chip buses (see also TC1766 block diagram on Page 2-6): • Local Memory Bus (LMB) • System Peripheral Bus (SPB) The LMB Bus connects the CPU local resources for data and instruction fetch. The Local Memory Bus interconnects the memory units and functional units, such as CPU and PMU. The main target of the LMB bus is to support devices with fast response times, optimized for speed. This allows the DMI and PMI fast access to local memory and reduces load on the FPI bus. The Tricore system itself is located on LMB bus. The Local Memory Bus is a synchronous, pipelined, split bus with variable block size transfer support. It supports 8-, 16-, 32- and 64-bit single transactions and variable length 64-bit block transfers. The SPB Bus is mainly governed by the PCP and is accessible to the CPU via the LMB Bus bridge. The System Peripheral Bus (SPB Bus) in TC1766 is an on-chip FPI Bus. The FPI Bus interconnects the functional units of the TC1766, such as the DMA and on-chip peripheral components. The FPI Bus is designed to be quick to be acquired by on-chip functional units, and quick to transfer data. The low setup overhead of the FPI Bus access protocol guarantees fast FPI Bus acquisition, which is required for time-critical applications.The FPI Bus is designed to sustain high transfer rates. For example, a peak transfer rate of up to 320 Mbyte/s can be achieved with a 80 MHz bus clock and 32-bit data bus. Multiple data transfers per bus arbitration cycle allow the FPI Bus to operate at close to its peak bandwidth. Both the LMB Bus and the SPB Bus runs at full CPU speed. The maximum CPU speed is 80 MHz. Additionally, two simplified bus interfaces are connected to and controlled by the DMA Controller: • DMA Bus • SMIF Interface
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