CF4320H_09 Datasheet, PDF (2/29 Pages) Texas Instruments – CompactFlash™ BUS-INTERFACE CHIP WITH ±15-kV ESD PROTECTION, TRANSLATION, AND CARD-DETECT CIRCUITRY

CF4320H
CompactFlash™ BUS-INTERFACE CHIP
WITH ±15-kV ESD PROTECTION, TRANSLATION, AND CARD-DETECT CIRCUITRY
SCES655A – APRIL 2006 – REVISED AUGUST 2006
www.ti.com
CARD-DETECT CIRCUIT
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, V_{CC_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. V_{CC_SD} is particularly helpful when the core
processor operates at a low V_CC, but the regulator needs a higher control-signal voltage.
CARD-DETECT SIGNALS
INPUTS
CD1
CD2
L
L
L
H
H
L
H
H
OUTPUT
SCD
L
H
H
H
T_A
–40°C to 85°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
LFBGA – GKF
Tape and reel
CF4320HGKFR
LFBGA – ZKF
Tape and reel
CF4320HZKFR
TOP-SIDE MARKING
CF4320
CF4320
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
BUS-TRANSCEIVER CIRCUIT
Command and Status Bits
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-kΩ pullup resistor. The
CF4320H includes an internal 100-kΩ pullup resistor on the input of each of these signals, which saves board
real estate and lowers overall system cost
MASTER_EN
L
L
L
H
COMMAND LINE BUFFERS⁽¹⁾
(BVD1, BVD2, INPACK, OE, IORD, IOWR,
READY, REG, CE1, CE2, WAIT, WE, WP)
INPUTS
BUF_EN
L
L
H
X
INPUT
H
L
X
X
OUTPUT
H
L
Z, Command line buffer inputs can float.
Z, low-power mode
(1) X = H or L
RESET ⁽¹⁾
INPUTS
MASTER_EN
SRESET
L
H
L
L
H
X
OUTPUT
RESET
H
L
Z, low-power mode
(1) X = H or L
2
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