been used more than fifteen years still running strong. This interface
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PI7C8150B 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 PI7C8150B Asynchronous PCI-to-PCI Bridge growing list Bridge products. PI7C8150B based existing PI7C8150, which full production. PI7C8150B introduces asynchronous mode support well enhanced performance. this application note, will describe asynchronous feature PI7C8150B.
Mohamad Tisani
does work asynchronous mode?
Asynchronous mode, designer will drive primary clock speed between onto P_CLK (Pin number ball number M4). designer will also provide Asynchronous Clock onto Mask_in/Async_CLK. (pin number ball number K15). order place device asynchronous mode will also need drive one. Asynchronous mode, secondary clock outputs S_Clkout (0:9) used devices secondary S_clkin. Figure below. SCLKOUT(0:9) will half frequency Asynch_CLK signal CLK_RATE LOW. CLK_RATE HIGH, then SCLKOUT(0:9) same frequency Asynch_CLK.
Benefits
asynchronous feature will allow 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 PI7C8150B will allow primary secondary busses speed between MHz. example, primary while secondary MHz.
Input Primary Clock 25-66
S_Clkin
P_CLK (pin
PI7C8150B
S_Clkout(0:9) Msk_in/Async_clk Asynchronous Clock 25-66 Slot Slot Slot
Conclusion
PI7C8150B used synchronous asynchronous modes. Asynchronous mode Bridge will also provide secondary clock 8150B device well clocks secondary devices. Asynchronous feature very useful since will allow designer primary secondary busses totally independent clock speeds alignment.
AN71
03/10/04
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