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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

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

CARD-DETECT SIGNALS

INPUTS

OUTPUT

SCD

CD1

CD2

L

L

L

L

H

H

H

L

H

H

H

H

ORDERING INFORMATION

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

(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

INPUTS

OUTPUT

RESET

MASTER_EN

SRESET

L

H

H

L

L

L

H

X

Z, low-power mode

(1)

X = H or L

2

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