Flash memory card with enhanced operating mode detection and user-friendly interfacing system

• US 6,721,819 B2
• Filed: 08/28/2001
• Issued: 04/13/2004
• Est. Priority Date: 03/02/1998
• Status: Expired due to Fees

• Current Assignee: Micron Technology, Inc.
• Original Assignee: Lexar Media Incorporated (Micron Technology, Inc.)
• Inventors: Assar, Mahmud, Estakhri, Petro
• Primary Examiner(s): Elamin, Abdelmoniem I
• Application Number:
  US09/940,972
• Publication Number:
  US 20020040412A1
• Time in Patent Office: 959 Days
• Field of Search: 710/11, 710/8, 710/2, 710/62, 710/72, 714/3
• US Class Current: 710/11
• CPC Class Codes: G06F 13/387 for adaptation of different data processing systems to different peripheral devices, e.g. protocol converters for incompatible systems, open system
• CPC Class Codes: G06F 13/4081 Live connection to bus, e.g. hot-plugging current or voltage limitation during live insertion H02H9/004
• CPC Class Codes: G06F 2213/0042 Universal serial bus [USB]
• CPC Class Codes: G11C 7/1045 Read-write mode select circuits
• CPC Class Codes: G11C 7/20 Memory cell initialisation circuits, e.g. when powering up or down, memory clear, latent image memory

Abstract

An interfacing system facilitating user-friendly connectivity in a selected operating mode between a host computer system and a flash memory card. The interfacing system includes an interface device and a flash memory card. The interfacing system features significantly expanded operating mode detection capability within the flash memory card and marked reduction in the incorrect detection of the operating mode. The interface device includes a first end for coupling to the host computer and a second end for coupling to the flash memory card, while supporting communication in the selected operating mode which is also supported by the host computer system. The flash memory card utilizes a fifty pin connection to interface with the host computer system through the interface device. The fifty pin connection of the flash memory card can be used with different interface devices in a variety of configurations such as a universal serial mode, PCMCIA mode, and ATA IDE mode. Each of these modes of operation require different protocols. Upon initialization with the interface device, the flash memory card automatically detects the selected operating mode of the interface device and configures itself to operate with the selected operating mode. The operating mode detection is accomplished by sensing unencoded signals and encoded signals. The encoded signals are encoded with a finite set of predetermined codes. Each predetermined code uniquely identifies a particular operating mode.

Claims

1. A method of automatically configuring a peripheral device to communicate with a host computer system in a selected operating mode, comprising the following steps:

a. coupling the peripheral device to the host computer system, the coupling step establishing a communication channel between the peripheral device and the computer system;

b. powering the peripheral device;

c. sequentially analyzing within the peripheral device plurality of signals until the selected operating mode is identified; and

d. automatically configuring the peripheral device into the selected operating mode in response to unencoded and encoded signals.

2. The method according to claim 1 wherein the step of sequentially analyzing the signals includes the following steps:

a. sensing within the peripheral device the encoded signal originating from the host computer system and the unencoded signal originating from the host computer system; and

b. encoding a preencoded signal originating from the host computer system with a finite set of predetermined codes, each predetermined code uniquely identifying an operating mode, thereby transforming the preencoded signal into the encoded signal.

3. The method according to claim 2 further comprising the step of configuring the peripheral device into a preliminary operating mode before the step of encoding the preencoded signal.

4. The method according to claim 3 wherein the preliminary operating mode is an ATA IDE mode.

5. The method according to claim 1 wherein the peripheral device is a flash memory card.

6. The method according to claim 5 wherein the encoded signal is an ATA IDE operating mode signal pin selected from HA3, HA4, HA5, HA6, HA7, HA8, HA9, and HA 10.

7. The method according to claim 1 wherein the selected operating mode is a PCMCIA mode.

8. The method according to claim 1 wherein the selected operating mode is a universal serial bus mode.

9. The method according to claim 1 wherein the selected operating mode is an ATA IDE mode.