been used more than fifteen years still running strong. This interface
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PI7C8152B, Asynchronous Feature
been used more than fifteen years still running strong. This interface being developed PCs, Servers, Notebooks, Datacom Telecom Systems. With many different devices peripherals being placed systems today, need Bridges becomes essential. Pericom added PI7C8152B Asynchronous PCI-to-PCI Bridge growing list Bridge products. PI7C8152B based existing PI7C8152, which full production. PI7C8152B introduces asynchronous mode support well enhanced performance. this application brief, will describe asynchronous feature PI7C8152B.
Mohamad Tisani
does work asynchronous mode?
Asynchronous mode, designer will drive primary clock speed between onto P_CLK (Pin number 66). board designer will also provide clock input S_CLKIN (pin number which MHz. synchronous mode, secondary clock outputs used devices secondary bus. However, asynchronous mode, secondary clock outputs cannot used devices secondary bus. Instead, clock buffer used drive PI7C8152 S_CLKIN must used secondary devices. Figure
Benefits
asynchronous feature allows designers have flexibility Primary Secondary busses asynchronous speeds. This important especially interfacing slower legacy devices. typical synchronous bridge only allows secondary either same speed half speed primary bus. Pericom's asynchronous PI7C8152B will allow primary secondary busses speed between MHz. example, primary while secondary MHz.
Input Primary Clock
P_CLK (pin PI7C8152 S_CLKIN (pin S_Clkout used
Secondary Clock
PI6C2510 PI6C2410 PI49FCT3805 Clock Buffer
Slot Slot Slot
Figure
Conclusion
PI7C8152B used synchronous asynchronous modes. Asynchronous mode designer will have provide secondary clock 8152B device well clocks secondary devices. Asynchronous feature very useful since will allow designer primary secondary busses totally independent clock speeds alignment
Figure
Page
AB45
10/20/03
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