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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) 24 Page - Texas Instruments |
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PCI1221 датащи(HTML) 24 Page - Texas Instruments |
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24 / 123 page  PCI1221 GHK/PDV PC CARD CONTROLLERS SCPS042 – JULY 1998 24 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 loading subsystem identification (continued) In some conditions, such as in a docking environment, the subsystem vendor ID register and subsystem ID register must be loaded with a unique identifier via a serial EEPROM. The PCI1221 loads the data from the serial EEPROM after a reset of the primary bus. Note that the SUSPEND input gates the PCI reset from the entire PCI1221 core, including the serial bus state machine (see suspend mode, on page 40, for details on using SUSPEND). The PCI1221 provides a two-line serial bus host controller that can be used to interface to a serial EEPROM. Refer to serial bus interface on page 29 for details on the two-wire serial bus controller and applications. PC Card applications This section describes the PC Card interfaces of the PCI1221: D Card insertion/removal and recognition D P2C power-switch interface D Zoom video support D Speaker and audio applications D LED socket activity indicators D CardBus socket registers PC Card insertion/removal and recognition The 1997 PC Card Standard addresses the card-detection and recognition process through an interrogation procedure that the socket must initiate on card insertion into a cold, nonpowered socket. Through this interrogation, card voltage requirements and interface (16 bit versus CardBus) are determined. The scheme uses the CD1, CD2, VS1, and VS2 signals (CCD1, CCD2, CVS1, and CVS2 for CardBus). The configuration of these four terminals identifies the card type and voltage requirements of the PC Card interface. The encoding scheme is defined in the 1997 PC Card Standard and in Table 5. Table 5. PC Card Card-Detect and Voltage-Sense Connections CD2//CCD2 CD1//CCD1 VS2//CVS2 VS1//CVS1 KEY INTERFACE VOLTAGE Ground Ground Open Open 5 V 16-bit PC Card 5 V Ground Ground Open Ground 5 V 16-bit PC Card 5 V and 3.3 V Ground Ground Ground Ground 5 V 16-bit PC Card 5 V, 3.3 V, and X.X V Ground Ground Open Ground LV 16-bit PC Card 3.3 V Ground Connect to CVS1 Open Connect to CCD1 LV CardBus PC Card 3.3 V Ground Ground Ground Ground LV 16-bit PC Card 3.3 V and X.X V Connect to CVS2 Ground Connect to CCD2 Ground LV CardBus PC Card 3.3 V and X.X V Connect to CVS1 Ground Ground Connect to CCD2 LV CardBus PC Card 3.3 V, X.X V, and Y.Y V Ground Ground Ground Open LV 16-bit PC Card Y.Y V Connect to CVS2 Ground Connect to CCD2 Open LV CardBus PC Card Y.Y V Ground Connect to CVS2 Connect to CCD1 Open LV CardBus PC Card X.X V and Y.Y V Connect to CVS1 Ground Open Connect to CCD2 LV CardBus PC Card Y.Y V Ground Connect to CVS1 Ground Connect to CCD1 Reserved Ground Connect to CVS2 Connect to CCD1 Ground Reserved |
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