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CF4320HZKFR Datasheet(PDF) 2 Page - Texas Instruments |
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CF4320HZKFR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 27 page www.ti.com CARD-DETECT CIRCUIT BUS-TRANSCEIVER CIRCUIT Command and Status Bits CF4320H CompactFlash™ BUS-INTERFACE CHIP WITH ±15-kV ESD PROTECTION, TRANSLATION, AND CARD-DETECT CIRCUITRY SCES655 – APRIL 2006 The CF4320H has an integrated card-detect circuit that generates a LOW card-detect signal when a CF card is plugged into the socket. This circuit is supplied by a separate power-supply pin, VCC_SD, which operates from 1.65 V to 5.5 V. The card-detect signal can be used to control a voltage regulator, which may power the CF slot and the CF side of the CF4320H. The inputs to this circuitry (CD1 and CD2) have internal pullup resistors to pull them to a HIGH logic state if there is no card in the CF slot. VCC_SD is particularly helpful when the core processor operates at a low VCC, but the regulator needs a higher control-signal voltage. CARD-DETECT SIGNALS INPUTS OUTPUT SCD CD1 CD2 L L L L H H H L H H H H ORDERING INFORMATION TA PACKAGE(1) ORDERABLE PART NUMBER TOP-SIDE MARKING LFBGA – GKF Tape and reel CF4320HGKFR CF4320 –40 °C to 85°C LFBGA – ZKF Tape and reel CF4320HZKFR CF4320 (1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Most CF controllers are embedded in processors or microcontrollers and use GPIOs to send command signals and receive status signals from the card to manage operation. The CF interface consists of eight control signals and six status signals. The CF standard requires that each of these signals have a 100-k Ω pullup resistor. The CF4320H includes an internal 100-k Ω pullup resistor on the input of each of these signals, which saves board real estate and lowers overall system cost COMMAND LINE BUFFERS(1) (BVD1, BVD2, INPACK, OE, IORD, IOWR, READY, REG, CE1, CE2, WAIT, WE, WP) INPUTS OUTPUT MASTER_EN BUF_EN INPUT L L H H L L L L L H X Z, Command line buffer inputs can float. H X X Z, low-power mode (1) X = H or L RESET(1) INPUTS OUTPUT RESET MASTER_EN SRESET L H H L L L H X Z, low-power mode (1) X = H or L 2 Submit Documentation Feedback |
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