| 摘要 |
PURPOSE: A buffer for rearranging cells is provided to use a relative time which takes the cell comes a switch network, as zero, without requesting a common clock for a time stamp. CONSTITUTION: A buffer for rearranging cells comprises a maximum delay register(218), a base address raise register(216), cell buffer(212), delayer(214), a cell address generator, a multiplexer(224), a memory address register(226), a memory buffer register(234), a cell buffer memory(236), a first flipflop(228), a memory assigning map(230), and a second flipflop(232). The maximum delay register(218) has a specific initial value by initializing as a maximum of slots storing cells, and outputs a maximum delay by the specific initial value, through an internal clock. The base address raise register(216) stores a base address of a circulating range by raising the initial value one by one with the circulating type by a cell time clock, and outputs the base address by the internal clock. The cell storage address generator is composed of a subtracter(220) and an adder(222). The cell buffer memory(236) stores cells applied from the memory buffer register(234) in a cell storage address, and outputs a cell responded to a base address the memory address register indicates. The first flipflop(228) latches the cell reaching signal. The memory assigning map(230) stores in a bit responded to the cell storage address which the memory address register indicates, so as to respond to the cell stored available cell information of the cell responded to a signal reaching a latched cell, and outputs available cell information to the bit. The second flipflop(232) latches the available cell information.
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