| 摘要 |
PURPOSE: A method for managing the inter processor communication transmission queue of a PCCA(Processor Communication Controller board Assembly) in a full electronic telephone exchange is provided to replace an existing DMA(Direct Memory Access) queue by defining 64 transmission buffer identifiers and configuring them in the form of a ring buffer. CONSTITUTION: A transmission control board consists of a memory(10) and an SCC(Serial Communication Controller)(40). The memory(10) is composed of a DRAM or an SRAM comprising a processor window list, standby messages, and 64 transmission buffer identifier blocks. The SCC(40) contains a FIFO(First-In First-Out buffer)(30) that transmits a message as soon as it is inputted. The FIFO(30) is of a 16-byte self-contained type. The 64 transmission buffer identifiers of the memory(10) are defined by variable declaration. The SCC(40) manages these 64 transmission buffer identifiers.
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