发明名称 |
Application specific integrated circuit with dual-mode system for externally accessible data buses and visibility buses |
摘要 |
An application specific integrated circuit includes a multiplicity of operational blocks each of which includes at least one respective data bus and at least one respective visibility bus and a respective addressable multiplexer for selecting between those buses to provide an output on a to respective block bus. An interface block includes a first addressable multiplexer for selecting output data from a selected one of the blocks and providing an output; a register coupled to the output of the first addressable multiplexer; and a second addressable multiplexer for selecting between data provided by the output of the first addressable multiplexer and data in the register. Different portions of externally supplied address words are applied to the first addressable multiplexer and the respective addressable multiplexer, and a decoder is responsive to the address words for controlling the second addressable multiplexer. The arrangement provides a common multiplexing system for data buses and visibility buses.
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申请公布号 |
US6625684(B1) |
申请公布日期 |
2003.09.23 |
申请号 |
US20000668301 |
申请日期 |
2000.09.25 |
申请人 |
3COM CORPORATION |
发明人 |
CASEY FERGUS;GAVIN VINCENT;ALLWRIGHT GARETH E;CHOI KAM;HAY CHRISTOPHER;LOUGHRAN KEVIN;GIBSON PATRICK |
分类号 |
G01R31/3185;G06F11/267;(IPC1-7):G06F13/00;G06F11/00 |
主分类号 |
G01R31/3185 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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