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AN266

How to Connect NAND Flash Memory to an EP93xx

1. Introduction

This document describes two different methods that can be used to connect NAND FLASH to an EP93xx

device. The first approach takes advantage of the data bus and uses fewer GPIO pins. The second ap-

praoch uses GPIO exclusively.

2. Implementation Using GPIO Interrupt (for EP93xx)

Please refer to the partial schematic below. GPIOx, GPIOy, and GPIOz may be any GPIO pins from the

EP93xx device. Not all of the devices in the EP93xx family have all of their GPIO port pins bonded out.

Refer to the datasheet for the specific device you are using. It is suggested that all the GPIO pins con-

nected to the NAND device belong to the same port for efficient code. However, this is not a requirement.

There is no GPIO signal connected to pin 7 of the NAND device in the figure below. It is not required be-

cause the ready status can be read from a bit in the Status register. If the design uses pin 7, make sure

that the GPIO line used has interrupt capability. Referring to the EP93xx User's Guide, GPIO section, you

will notice Ports A, B, and F have interrupt capability. Note that Port A and B have interrupt capability but

it is implemented as a single interrupt signal called GPIOINTR. All pins on Port F are available to the sys-

tem interrupt controller as GPIO[7:0]INTR.

The example below connects an EP93xx to the SAMSUNG K9F2G08U0M.

Figure 1. Example of Implementation Using Minimal GPIO

/NAND_RE

GPIOy D0

/WE

GPIOx

/RE

/CSx

/NAND_WE

PWR_3V3

GPIOz

K9F2G08

ALE

CLE

R/B

PWR_3V3

GND

PRE

FEB ‘05

AN266REV1

1 2 3 4

Résumé du contenu

Page 1 - 1. Introduction

Page 2 - K9F2G08U0M

AN2662 AN266REV13. Implementation Using GPIO (for EP931x)Alternatively, the general purpose I/O (GPIO) pins can be used to provide an easy way to cont

Page 3 - AN266REV1 3

AN266AN266REV1 33.1 “Read Flash ID” Sample CodeULONG ulMakerCode;ULONG ulDeviceCode;ULONG ulIDData;*GPIO_PBDDR = 0x5E; //// Write Read ID Command//*GP

Page 4 - Release Date Changes

AN2664 AN266REV1Table 1. Revision History Release Date ChangesREV1 Febuary 2005 Initial ReleaseContacting Cirrus Logic SupportFor a complete listing o

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Cirrus-logic AN266 Manuel d'utilisateur

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