Cypress Semiconductor CY7C68023 Manual de usuario

EZ-USB NX2LP™ USB 2.0 NAND

Flash Controlle

CY7C68023/CY7C68024

Cypress Semiconductor Corporation • 198 Champion Court • San Jose,CA 95134-1709 • 408-943-2600

Document #: 38-08055 Rev. *B Revised October 5, 2005

1.0 Features

• High (480-Mbps) or full (12-Mbps) speed USB support

• Both common NAND page sizes supported

— 512bytes—Up to 1 Gbit Capacity

— 2K bytes—Up to 8 Gbit Capacity

• 8 chip enable pins

— Up to 8 NAND Flash single-device chips

— Up to 4 NAND Flash dual-device chips

• Industry standard ECC NAND Flash correction

— 1 bit per 256 correction

— 2 bit error detection

• Industry standard (SmartMedia) page management for

wear leveling algorithm, bad block handling, and

Physical to Logical management.

• Supports 8-bit NAND Flash interfaces

• Supports 30-ns, 50-ns, 100-ns NAND Flash timing

• Complies with USB Mass Storage Class Specification

rev 1.0

• CY7C68024 complies with USB 2.0 Specification for

Bus-Powered Devices (TID# 40460274)

• 43-mA Typical Active Current

•Space-saving and lead-free 56-QFN package (8 mm ×

8mm)

• Support for board-level manufacturing test via USB

interface

• 3.3V NAND Flash operation

• NAND Flash power management support

2.0 Introduction

The EZ-USB NX2LP (NX2LP) implements a USB 2.0 NAND

Flash controller. This controller adheres to the Mass Storage

Class Bulk-Only Transport Specification. The USB port of the

NX2LP is connected to a host computer directly or via the

downstream port of a USB hub. Host software issues

commands and data to the NX2LP and receives status and

data from the NX2LP using standard USB protocol.

The NX2LP supports industry leading 8-bit NAND Flash inter-

faces and both common NAND page sizes of 512 and 2k

bytes. Eight chip enable pins allow the NX2LP to be connected

to up to eight single- or four dual-device NAND Flash chips.

Certain NX2LP features are configurable, enabling the NX2LP

to meet the needs of different designs’ requirements.

Figure 1-1. NX2LP Block Diagram

USB 2.0

Xceiver

Smart HS/

FS USB

Engine

NAND Flash

Interface

Logic

8-bit Data Bus

NAND Control Signals

EZ-USB NX2LP

Internal Control Logic

PLL

24 MHz

Xtal

VBUS

D+

D-

Data

Control

Chip Reset

LED1#

LED2#

Write Protect

Chip Enable Signals

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 2 of 9

3.0 Pin Assignments

3.1 Pin Diagram

Figure 3-1. 56-pin QFN

3.2 Pin Descriptions

Pin Name Type Default State at Start-up Description

1R_B1#[1] I Z Ready/Busy 1 (2.2k to 4k pull-up resistor is required)

2R_B2# I Z Ready/Busy 2 (2.2k to 4k pull-up resistor is required)

3AVCC PWR PWR Analog 3.3V supply

4XTALOUT Xtal N/A Crystal output

5XTALIN Xtal N/A Crystal input

6AGND GND GND Ground

7AVCC PWR PWR Analog 3.3V supply

8DPLUS I/O ZUSB D+

9DMINUS I/O ZUSB D-

10 AGND GND GND Ground

11 VCC PWR PWR 3.3V supply

12 GND GND GND Ground

13 N/C N/A N/A No connect

14 GND GND GND Ground

15 Reserved N/A N/A Must be tied HIGH (no pull-up resistor required)

Note:

1. A # sign after the pin name indicates that it is an active LOW signal.

RESET#

GND

N/C

WP_SW#

WP_NF#

LED2#

LED1#

ALE

CLE

VCC

RE1#

RE0#

WE#

R_B1#

R_B2#

AVCC

XTALOUT

XTALIN

AGND

AVCC

DPLUS

DMINUS

AGND

VCC

GND

N/C

GND

Reserved

VCC

DD0

DD1

DD2

DD3

DD4

DD5

DD6

DD7

GND

VCC

GND

VCC

N/C

GND

CE7#

CE6#

CE5#

CE4#

CE3#

CE2#

CE1#

CE0#

Reserved

VCC

EZ-USB NX2LP

56-pin QFN

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 3 of 9

16 Reserved N/A N/A Must be tied HIGH (no pull-up resistor required)

17 VCC PWR PWR 3.3V supply

18 DDO I/O ZData 0

19 DD1 I/O ZData 1

20 DD2 I/O ZData 2

21 DD3 I/O ZData 3

22 DD4 I/O ZData 4

23 DD5 I/O ZData 5

24 DD6 I/O ZData 6

25 DD7 I/O ZData 7

26 GND GND GND Ground

27 VCC PWR PWR 3.3V supply

28 GND GND GND Ground

29 WE# O H Write enable

30 RE0# O H Read Enable 0

31 RE1# O H Read Enable 1

32 VCC PWR PWR 3.3V supply

33 CLE O Z Command latch enable

34 ALE O Z Address latch enable

35 LED1# O Z Data activity LED sink

36 LED2# O Z Chip active LED sink

37 WP_NF# O Z Write-protect NAND Flash

38 WP_SW# I Z Write-protect switch input

39 N/C N/A N/A No connect

40 N/C N/A N/A No connect

41 GND GND GND Ground

42 RESET# I Z NX2LP chip reset

43 VCC PWR PWR 3.3V supply

44 Reserved N/A N/A Must be tied HIGH

45 CE0# O Z Chip enable 0

46 CE1# O Z Chip enable 1

47 CE2# O Z Chip enable 2

48 CE3# O Z Chip enable 3

49 CE4# O Z Chip enable 4

50 CE5# O Z Chip enable 5

51 CE6# O Z Chip enable 6

52 CE7# O Z Chip enable 7

53 GND GND GND Ground

54 N/C N/A N/A No connect

55 VCC PWR PWR 3.3V supply

56 GND GND GND Ground

3.2 Pin Descriptions (continued)

Pin Name Type Default State at Start-up Description

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 4 of 9

3.3 Additional Pin Descriptions

3.3.1 DPLUS, DMINUS

DPLUS and DMINUS are the USB signaling pins, and they

should be tied to the D+ and D– pins of the USB connector.

Because they operate at high frequencies, the USB signals

require special consideration when designing the layout of the

PCB. General guidelines are given at the end of this

document.

3.3.2 XTALIN, XTALOUT

The NX2LP requires a 24-MHz (±100 ppm) signal to derive

internal timing. Typically, a 24-MHz (20-pF, 500-µW, parallel-

resonant fundamental mode) crystal is used, but a 24-MHz

square wave from another source can also be used. If a crystal

is used, connect its pins to XTALIN and XTALOUT, and also

through 12-pF capacitors to GND. If an alternate clock source

is used, apply it to XTALIN and leave XTALOUT open.

3.3.3 Data[7-0]

The Data[7-0] I/O pins provide an 8-bit interface to a NAND

Flash device. These pins are used to transfer address,

command, and read/write data between the NX2LP and NAND

Flash.

3.3.4 R_B[2-1]#

The Ready/Busy input pins are used to determine the state of

the currently selected NAND Flash device. These pins must

be pulled HIGH through a 2k-4k resistor. These pins are pulled

LOW by the NAND Flash when it is busy.

3.3.5 WE#

The Write Enable output pin is used by the NAND Flash to

latch commands, address, and data during the rising edge of

the pulse.

3.3.6 RE[1-0]#

The Read Enable output pins are used to control the data flow

from the NAND Flash devices. The device presents valid data

and will increment its internal column address counter by one

step on each falling edge of the Read Enable pulse. A 10k pull-

up is an option For RE1-0#.

3.3.7 CLE

The Command Latch Enable output pin is used to indicate that

the data on the I/O bus is a command. The data is latched into

the NAND Flash control register on the rising edge of WE#

when CLE is HIGH.

3.3.8 ALE

The Address Latch Enable output pin is used to indicate that

the data on the I/O bus is an address. The data is latched into

the NAND Flash address register on the rising edge of WE#

when ALE is HIGH.

3.3.9 LED1#

The Data Activity LED output pin is used to indicate data

transfer activity. LED1# is asserted LOW at the beginning of a

data transfer, and set to a high-Z state when the transfer is

complete. If this functionality is not utilized, leave LED1#

floating.

3.3.10 LED2#

The Chip Active LED output pin is used to indicate proper

device operation. LED2# is asserted LOW when the NX2LP is

powered and initialized. It is placed in a high-Z state under all

other conditions. If this functionality is not utilized, leave

LED2# floating.

3.3.11 WP_NF#

The Write-protect NAND Flash output pin is used to control the

write-protect pins on NAND Flash devices. This pin should be

tied to the Write Protect pins of the NAND Flash devices. If

WP_SW# is asserted LOW during a data transfer, or if internal

operations are still pending, the NX2LP will wait until the

operation is complete before asserting WP_NF# to ensure that

there is no data loss or risk of OS error.

3.3.12 WP_SW#

The Write-protect Switch input pin is used to select whether or

not NAND Flash write-protection is enabled by the NX2LP.

When the pin is asserted LOW, the NX2LP will report to the

host that the NAND Flash is write-protected, the WP_NF# will

be driven LOW, and any attempts to write to the configuration

data memory area will be blocked by the NX2LP. If this pin is

asserted LOW during a data transfer, or if internal operations

are still pending, the NX2LP will wait until the operation is

complete before asserting WP_NF# to ensure that there is no

data loss or risk of OS error.

3.3.13 CE[7-0]#

The Chip Enable output pins are used to select the NAND

Flash that the NX2LP will interface. Unused Chip Enable pins

should be left floating.

3.3.14 RESET#

Asserting RESET# for 10 ms will reset the NX2LP. A reset

and/or watchdog chip is recommended to ensure that startup

and brownout conditions are properly handled.

Figure 3-2. XTALIN, XTALOUT Diagram

24-MHz Xtal

12 pF

XTALIN XTALOUT

12 pF

12-pF capacitor

values assume a

trace capacitance

of 3 pF per side on a

four-layer FR4 PCB

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 5 of 9

4.0 Applications

The NX2LP is a high-speed USB 2.0 peripheral device that

connects NAND Flash devices to a USB host using the USB

Mass Storage Class protocol.

4.1 Additional Resources

• CY3685 EZ-USB NX2LP Development Kit

• CY4618 EZ-USB NX2LP Reference Design Kit

• USB Specification version 2.0

• USB Mass Storage Class Bulk Only Transport Specification,

http://www.usb.org/developers/data/devclass/

usbmassbulk_10.pdf.

5.0 Functional Overview

5.1 USB Signaling Speed

The NX2LP operates at two of the three rates defined in the

USB Specification Revision 2.0 dated April 27, 2000:

• Full speed, with a signaling bit rate of 12 Mbits/sec

• High speed, with a signaling bit rate of 480 Mbits/sec.

The NX2LP does not support the low-speed signaling rate of

1.5 Mbits/sec.

5.2 NAND Flash Interface

During normal operation the NX2LP supports an 8-bit I/O

interface, eight chip enable pins, and other control signals

compatible with industry standard NAND Flash devices.

6.0 Enumeration

During the start-up sequence, internal logic checks for the

presence of NAND Flash with valid configuration data in the

configuration data memory area. If valid configuration data is

found, the NX2LP uses the values stored in NAND Flash to

configure the USB descriptors for normal operation as a USB

mass storage device. If no NAND Flash is detected, or if no

valid configuration data is found in the configuration data

memory area, the NX2LP uses the default values from internal

ROM space for manufacturing mode operation. The two

modes of operation are described in sections 6.1 and 6.2

below.

6.1 Normal Operation Mode

In Normal Operation Mode, the NX2LP behaves as a USB 2.0

Mass Storage Class NAND Flash controller. This includes all

typical USB device states (powered, configured, etc.). The

USB descriptors are returned according to the data stored in

the configuration data memory area. Normal read and write

access to the NAND Flash is available in this mode.

6.2 Manufacturing Mode

In Manufacturing mode, the NX2LP enumerates using the

default descriptors and configuration data that are stored in

internal ROM. This mode allows for first-time programming of

the configuration data memory area, as well as board-level

manufacturing tests.

A unique USB serial number is required for each device in

order to comply with the USB Mass Storage specification.

Also, Cypress requires designers to use their own Vendor ID

for final products. The Vendor ID is obtained through regis-

tration with the USB Implementor’s Forum (USB-IF), and the

Product ID is determined by the designer.

Cypress provides all the software tools and drivers necessary

for properly programming and testing the NX2LP. Please refer

to the documentation in the development or reference design

kit for more information on these topics.

6.3 Configuration Data

Certain features in the NX2LP can be configured by the

designer to disable unneeded features, and to comply with the

USB 2.0 specification’s descriptor requirements for mass

storage devices. Table 6-1 lists the variable configuration data

and the default values that are stored in internal ROM space.

The default ROM values are returned by an unprogrammed

NX2LP device.

NAND Flash

Programmed?

Load Default

Descriptors and

Configuration Data

Manufacturing

Mode

Load Custom

Descriptors and

Configuration Data

Enumerate As

USB Mass

Storage Device

Normal Operation

Mode

Start-up

Enumerate As

Generic NX2LP

Device

NAND Flash

Present?

Yes

Yes No

Figure 6-1. NX2LP Enumeration Process

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CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 6 of 9

7.0 Design Notes For The Quad Flat No Lead

(QFN) Package

The NX2LP comes in a 56-pin QFN package, which utilizes a

metal pad on the bottom to aid in heat dissipation. The low-

power operation of the NX2LP makes the thermal pad on the

bottom of the QFN package unnecessary. Because of this,

PCB layout may utilize the space under the NX2LP for routing

signals as needed, provided that any traces or vias under the

thermal pad are covered by solder mask or other material to

prevent shorting. Standard PCB layout recommendations for

USB devices still apply.

For further information on this package design, please refer to

the application note from AMKOR titled “Surface Mount

Assembly of AMKOR’s MicroLeadFrame (MLF) Technology.”

This application note provides detailed information on board

mounting guidelines, soldering flow, rework process, etc.

8.0 PCB Layout Recommendations

The following recommendations should be followed to ensure

reliable High-speed USB performance operation.

• A four-layer impedance controlled board is recommended

to ensure best signal quality.

• Specify impedance targets (ask your board vendor what

they can achieve).

• Maintain trace widths and trace spacing to control imped-

ance.

• Minimize stubs on DPLUS and DMINUS to avoid reflected

signals.

• Place any connections between the USB connector shell

and signal ground near the USB connector.

• Use bypass/flyback caps on VBUS, placed near connector.

• Keep DPLUS and DMINUS trace lengths to within 2 mm of

each other in length, with preferred length of 20–30 mm.

• Maintain a solid ground plane under the DPLUS and DMI-

NUS traces. Do not allow the plane to be split under these

traces.

• Place no vias on the DPLUS or DMINUS trace routing.

• Isolate the DPLUS and DMINUS traces from all other signal

traces (use >10 mm. spacing for best signal quality).

Source for recommendations:

• EZ-USB FX2 PCB Design Recommendations, www.cy-

press.com/cfuploads/support/app_notes/FX2_PCB.pdf.

• High-speed USB Platform Design Guidelines,

www.usb.org/developers/data/hs_usb_pdg_r1_0.pdf.

9.0 Absolute Maximum Ratings

Storage Temperature...................................–65°C to +150°C

Ambient Temperature with Power

Supplied............................................................ 0°C to +70°C

Supply Voltage to Ground Potential................–0.5V to +4.0V

DC Input Voltage to Any Input Pin ................................ 5.25V

DC Voltage Applied to Outputs

in High-Z State..................................... –0.5V to VCC + 0.5V

Power Dissipation..................................................... 300 mW

Static Discharge Voltage.............................................. 2000V

Max Output Current per IO port................................... 10 mA

10.0 Operating Conditions[2]

TA(Ambient Temperature Under Bias) ............. 0°C to +70°C

Supply Voltage............................................+3.00V to +3.60V

Ground Voltage.................................................................. 0V

FOSC (Oscillator or Crystal Frequency) ... 24 MHz ± 100 ppm

Parallel Resonant

Note:

2. If an alternate clock source is input on XTALIN, it must be supplied with standard 3.3V signaling characteristics and XTALOUT must be left floating.

Table 6-1. Variable Configuration Data And Default ROM Values

Configuration Data Description Default ROM Value

Vendor ID USB Vendor ID (Assigned by USB-IF) 0x04B4 (Cypress)

Product ID USB Product ID (Assigned by designer) 0x6813

Serial Number USB serial number N/A

Manufacturer String Manufacturer string in USB descriptors N/A

Product String Product string in USB descriptors N/A

Enable Write Protection Enables write protection capability Enabled

SCSI Device Name String shown in the device manager properties N/A

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 7 of 9

12.0 AC Electrical Characteristics

12.1 USB Transceiver

The NX2LP’s USB interface complies with the USB 2.0 speci-

fication for bus-powered devices.

12.2 NAND Flash Timing

The NX2LP supports 30-ns, 50-ns, and 100-ns NAND Flash

devices.

13.0 Ordering Information

Note:

3. Measured at Max VCC, 25°C.

11.0 DC Characteristics

Parameter Description Conditions Min. Typ. Max. Unit

VCC Supply Voltage 3.0 3.3 3.6 V

VCC Ramp Supply Ramp-up 0V to 3.3V 200 µs

VIH Input High Voltage 2 5.25 V

VIL Input Low Voltage –0.5 0.8 V

IIInput Leakage Current 0 < VIN < VCC ±10 µA

VIH_X Crystal Input HIGH Voltage 2 5.25 V

VIL_X Crystal Input LOW Voltage –0.5 0.8 V

VOH Output Voltage High IOUT = 4 mA 2.4 V

VOL Output Voltage Low IOUT = –4 mA 0.4 V

IOH Output Current High 4mA

IOL Output Current Low 4mA

CIN Input Pin Capacitance All but D+/D– 10 pF

Only D+/D– 15 pF

ICC Supply Current USB High Speed 50 mA

USB Full Speed 35 mA

ISUSP Suspend Current CY7C68023 Connected 0.5 1.2[3] mA

Disconnected 0.3 1.0[3] mA

CY7C68024 Connected 300 380[3] µA

Disconnected 100 150[3] µA

IUNCONFIG Unconfigured Current Before current requested in USB

descriptors is granted by the host

43 mA

TRESET Reset Time After Valid Power VCC > 3.0V 5.0 mS

Pin Reset After Valid Startup 200 µS

Part Number Package Type

CY7C68023-56LFXC 56-pin QFN Lead-free For Self/Bus Power

CY7C68024-56LFXC 56-pin QFN Lead-free For Battery Power

CY3685 EZ-USB NX2LP Development Kit

CY4618 EZ-USB NX2LP Reference Design Kit

[+] Feedback

CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 8 of 9

of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be

used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its

products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress

products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges.

14.0 Package Diagram

15.0 Disclaimers, Trademarks, and Copyrights

EZ-USB NX2LP is a trademark, and EZ-USB is a registered trademark, of Cypress Semiconductor Corporation. All product and

company names mentioned in this document are the trademarks of their respective holders.

Figure 14-1. 56-lead Quad Flatpack No Lead (8 x 8 mm) LF56

0.80[0.031]

7.70[0.303]

7.90[0.311]

1.00[0.039] MAX.

SEATING

PLANE

0.18[0.007]

0.50[0.020]

0.08[0.003]

0.50[0.020]

0.05[0.002] MAX.

(4X)

0.24[0.009]

0.20[0.008] REF.

0.80[0.031] MAX.

PIN1 ID

0°-12°

6.45[0.254]

8.10[0.319]

7.80[0.307]

6.55[0.258]

0.45[0.018]

0.20[0.008] R.

8.10[0.319]

7.90[0.311]

7.80[0.307]

7.70[0.303]

DIA.

0.28[0.011]

0.30[0.012]

6.55[0.258]

6.45[0.254]

0.60[0.024]

TOP VIEW BOTTOM VIEW

SIDE VIEW

E-PAD

(PAD SIZE VARY

BY DEVICE TYPE)

51-85144-*D

56-Lead QFN 8 x 8 MM LF56A

Dimensions in mm

E-Pad Size 4.3 x 5.0 mm (typ.)

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CY7C68023/CY7C68024

Document #: 38-08055 Rev. *B Page 9 of 9

Document History Page

Description Title: CY7C68023/CY7C68024 EZ-USB NX2LP™ USB 2.0 NAND Flash Controller

Document Number: 38-08055

REV. ECN NO.

Issue

Date

Orig. of

Change Description of Change

** 286009 SEE ECN GIR New Data Sheet (Preliminary Information).

*A 334796 SEE ECN GIR Adjusted default VID/PID; released as final.

*B 397024 SEE ECN GIR Changed Vcc to ±10% in DC Characteristics table. Changed the supply

voltage tolerance to ±10% in the Operating Conditions section. Added new

logo.

[+] Feedback

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