tailieunhanh - Semiconductor Technologies Part 16

Tham khảo tài liệu 'semiconductor technologies part 16', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | All-optical digital processing through semiconductor optical amplifiers state of the art and perspectives 443 of N network stages and its value univocally determines the packet route 0 identifies output port 1 and 1 identifies output port 2 of the incoming switch . Once the packet reaches the high priority input port Label Extractor and Packet Recognizer block isolate the address bit Ah and the PIH bit respectively where subscript H stands for High priority. If the packet enters low priority input port it is processed only by the Label Extractor in order to extract the address Al where L stands for Low priority. The PI is not necessary for low priority input port being this port conditioned by the high priority input. Ah Al and PIH form the input signals for the combinatorial network whose outputs are the Switching Control Generation SCG and Contention Resolution Control CRC signals. The former is responsible for switching bar cross configuration the latter drives the contention resolution block. For proper operation the combinational network must preserve the packet incoming from the high priority input PIH 1 and send it to the correct output port indicated into the address Ah . At the same time if contention is detected CRC 1 when Ah Al it must be resolved by the devoted block. On the other hand when PIH 0 high priority input packet not present the low priority packet must be redirected to the proper output port Al . If we associate the values 0 and 1 of the SCG to the switch cross and bar states respectively the truth table for the combinatorial network results as in Table 1. As first example we consider the case PIH 0 it means that the packet is not present at the high priority input. Thus physically the value for the corresponding address bit Ah is 0 . For what concerns the low priority input Al 0 states that the packet does not exist or that it must be routed to the output port 0 . In this case no contention occurs CRC 0 and the switch must be set in the .

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