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USB 2.0 Flash Drive Controller

Datasheet

SMSC USB97C242 Page 12 Revision 1.4 (05-03-07)

DATASHEET

Chapter 6 Pin Descriptions

This section provides a detailed description of each signal. The signals are arranged in functional groups

according to their associated interface.

The “n” symbol in the signal name indicates that the active, or asserted state occurs when the signal is at a

low voltage level. When “n” is not present before the signal name, the signal is asserted when at the high

voltage level.

The terms assertion and negation are used exclusively. This is done to avoid confusion when working with

a mixture of “active low” and “active high” signal. The term assert, or assertion indicates that a signal is

active, independent of whether that level is represented by a high or low voltage. The term negate, or

negation indicates that a signal is inactive.

Table 6.1 – USB97C242 Pin Descriptions

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

NAND FLASH/SMARTMEDIA INTERFACE

Write

Protect

nWP O12 This pin is an active low write protect signal for the SM or NAND flash

device.

Address

Strobe

ALE O12 This pin is an active high Address Latch Enable signal for the SM or

NAND flash device.

Command

Strobe

CLE O12 This pin is an active high Command Latch Enable signal for the SM or

NAND flash device.

Data7-0

D[7:0] I/OPU12 These pins are the bi-directional data signal D7-D0.

The bi-directional input signal should have an internal weak pull-up

resister on the input.

Read

Enable

nRE O24 This pin is an active low read strobe signal for SM or NAND flash device.

Write

Enable

nWE O12 This pin is an active low write strobe signal for SM or NAND flash device.

Write

Protect

Switch

nWPS IPU A write-protect seal is detected, when this pin is low.

This pin has an internal weak pull-up resistor.

Busy or

Data Ready

nB/R IPU This pin is connected to the BSY/RDY pin of the SM or NAND flash

device.

This pin has an internal weak pull-up resistor.

Chip

Enable

nCE OPU8 This pin is the active low chip enable signal to the SM or NAND flash

device.

This pin should be used to support a single SM or NAND flash device

only.

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 22 23

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