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PCI1451 Datasheet(PDF) 39 Page - Texas Instruments |
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PCI1451 Datasheet(HTML) 39 Page - Texas Instruments |
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39 / 141 page  3–7 Table 3–2. 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 3.4.2 P2C Power Switch Interface (TPS2202A/2206) A power switch with a PCMCIA-to-peripheral control (P2C) interface is required for the PC Card powering interface. The TI TPS2206 (or TPS2202A) Dual-Slot PC Card Power-Interface Switch provides the P2C interface to the CLOCK, DATA, and LATCH terminals of the PCI1451. Figure 3–8 shows the terminal assignments of the TPS2206. Figure 3–9 illustrates a typical application where the PCI1451 represents the PCMCIA controller. There are two ways to provide a clock source to the power switch interface. The first method is to provide an external clock source such as a 32 kHz real time clock to the CLOCK terminal. The second method is to use the internal ring oscillator. If the internal ring oscillator is used, then the PCI1451 provides its own clock source for the PC Card interrogation logic and the power switch interface. The mode of operation is determined by the setting of bit 27 (P2CCLK) of the system control register (PCI offset 80h). This bit is encoded as follows: 0 = CLOCK terminal is an input (default). 1 = CLOCK terminal is an output that utilizes the internal oscillator. A 43 k W pulldown resistor should be tied to the CLOCK pin. |
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