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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PCI1221 датащи(PDF) 40 Page - Texas Instruments |
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PCI1221 датащи(HTML) 40 Page - Texas Instruments |
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40 / 123 page  PCI1221 GHK/PDV PC CARD CONTROLLERS SCPS042 – JULY 1998 40 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 suspend mode The SUSPEND signal provides backward compatibility and gates the PCI reset (PRST) signal from the PCI1221. However, additional functionality has been defined for SUSPEND to provide additional power-management options. SUSPEND provides a mechanism to gate the PCLK from the PCI1221, as well as gate PRST. This can potentially save power while in an idle state; however, it requires substantial design effort to implement. Some issues to consider are: D What if cards are present in the sockets? D What if the cards in the sockets are powered? D How to pass CSC (insertion/removal) events. Even without the PCI clock to the PCI1221 core, asynchronous-type functions (such as RI_OUT) can pass CSC events, wake-up events, etc., back to the system. If a system designer chooses to not pass card removal events through to the system, then the PCI1221 would not be able to power down the empty socket without the power switch clock (CLOCK) generated externally. Refer to the P2C power switch interface for details. Figure 17 is a functional implementation diagram. PCI1221 Core SUSPEND PRST GNT PCLK Figure 17. SUSPEND Functional Implementation Figure 18 is a signal diagram of the suspend function. |
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