Memory, Sram, Flash Eprom, Nand Flash | Digi RCM4000 manual

Designer’s Handbook

Rabbit 4000 Microprocessor

4.6 Memory

4.6.1 SRAM

RCM4000 modules have 512K of data SRAM installed at U16.

4.6.2 Flash EPROM

All RCM4000 modules also have 512K of flash EPROM installed at U3.

NOTE: Rabbit Semiconductor recommends that any customer applications should not be constrained by the sector size of the flash EPROM since it may be necessary to change the sector size in the future.

Writing to arbitrary flash memory addresses at run time is discouraged. Instead, define a “user block” area to store persistent data. The functions writeUserBlock and readUserBlock are provided for this. Refer to the

for additional information.

4.6.3 NAND Flash

The RCM4000 model has a NAND flash to store data and Web pages. The NAND flash is particularly suitable for mass-storage applications, but is generally unsuitable for direct program execution. The NAND flash differs from parallel NOR flash (the type of flash memory used to store program code on Rabbit-based boards and RabbitCore modules currently in production) in two respects. First, the NAND flash requires error-correcting code (ECC) for reliability. Although NAND flash manufacturers do guarantee that block 0 will be error-free, most manufacturers guarantee that a new NAND flash chip will be shipped with a relatively small percentage of errors, and will not develop more than some maximum number or percentage of errors over its rated lifetime of up to 100,000 writes. Second, the standard NAND flash addressing method multiplexes commands, data, and addresses on the same I/O pins, while requiring that certain control lines must be held sta- ble for the duration of the NAND flash access. The software function calls provided by Rabbit Semiconductor for the NAND flash take care of the data-integrity and reliability attributes.

Sample programs in the SAMPLES\RCM4000\NANDFlash folder illustrate the use of the NAND flash. These sample programs are described in Section 3.2.1, “Use of NAND Flash.”

User’s Manual

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Digi RCM4000 user manual Memory, Sram, Flash Eprom, Nand Flash

Contents

RabbitCore RCM4000 Rabbit Semiconductor Trademarks Table of Contents Software Reference Appendix C. Power Supply 109 RabbitCore RCM4100 Introduction RCM4000 Features RCM4000 FeaturesFeature RCM4000 RCM4010 Advantages of the RCM4000 1 RCM4000 Development Kit Development and Evaluation Tools Online Documentation Software RabbitCore RCM4000 Getting Started Install Dynamic C Prepare the Prototyping Board for Development Hardware Connections Prototyping Board Attach Module to Prototyping Board Connect Programming Cable AC Adapter Connect Power Troubleshooting Run a Sample ProgramRun a Sample Program Technical Support Where Do I Go From Here? RabbitCore RCM4000 Introduction Running Sample Programs Sample Programs User’s Manual Use of Nand Flash RCM4000 only Click OK or Close to exit the various dialog boxes Serial Communication User’s Manual Real-Time Clock 3 A/D Converter Inputs RCM4000 only RabbitCore Module Hardware Reference Shows the RCM4000 pinouts for header J3 RCM4000 Digital Inputs and Outputs 4000 Pin Pin Name Default Use Alternate Use RCM4000 Pinout Configurations TXD PC0 PE1 Other Inputs and Outputs Memory I/O Interface Rabbit 4000 Serial Port and Clock Pins Serial CommunicationSerial Ports RJ-45 Ethernet Port Pinout Ethernet Port Programming Port Programming Cable Changing Between Program Mode and Run Mode Standalone Operation of the RCM4000 Resistor Divider Network for Analog Inputs A/D Converter RCM4000 only It is not referenced to Analog Supply Circuit 1 A/D Converter Power Supply Other Hardware Clock DoublerSpectrum Spreader Sram MemoryFlash Eprom Nand Flash RabbitCore RCM4000 More About Dynamic C Software Reference RabbitCore RCM4000 Digital I/O Dynamic C Function CallsSerial Communication Drivers Sram Use RabbitCore RCM4000 Board Initialization Prototyping Board Functions Alerts Void timedAlertunsigned long timeout Analog Inputs RCM4000 only ADS7870 Signal ADS7870 State RCM3400 Function/State On write operations Data value on read operations Gain Code Multiplier Unsigned int anaInDriverunsigned int cmd, unsigned int len AnaInConfig, anaIn, brdInit Gain Code Multiplier Voltage Range Single Diff ×10 ×16 ×20 126 Applies to Prototyping Board If successful If not able to make calibration constants Channel Code Single-Ended Voltage Range † Input Lines Float anaInVoltsunsigned int channel, unsigned int gaincode Float anaInDiffunsigned int channel, unsigned int gaincode Channel Code 20 mA Input Lines Float anaInmAmpsunsigned int channel Allchan Gain Code Voltage Range +AIN7 AIN6 Gain Code Voltage Range Add-On Modules Upgrading Dynamic C RabbitCore RCM4000 TCP/IP Connections Using the TCP/IP Features RabbitCore RCM4000 TCP/IP Primer on IP Addresses Typical Corporate Network IP Addresses Explained How IP Addresses are Used Dynamically Assigned Internet Addresses Placing Your Device on the Network Direct Connection Using a Hub Running TCP/IP Sample ProgramsDirect Connection How to Set IP Addresses in the Sample Programs Direct Connection PC to RCM4000 Module How to Set Up your Computer for Direct Connect Running Additional Sample Programs With Direct Connect Run the PINGME.C Sample Program Where Do I Go From Here? RabbitCore RCM4000 Appendix A. RCM4000 Specifications Dia × Electrical and Mechanical Characteristics Exclusion Zone Parameter RCM4000 RCM4010 Table A-1. RCM4000 Specifications Ten 8-bit timers 6 cascadable from the first Table A-2 Converter Specifications 1 A/D ConverterParameter Test Conditions Figure A-3. User Board Footprint for RCM4000 Headers Table A-4 .3 Volt DC Characteristics Rabbit 4000 DC CharacteristicsSymbol Parameter Maximum Rating Symbol Parameter Min Typ Max Bus Loading I/O Buffer Sourcing and Sinking LimitTable A-5. Capacitance of Rabbit 4000 I/O Ports Table A-6. External Capacitive Bus Loading -40C to +85C Iord Output Delay Table A-8. Preliminary Data and Clock Delays30 pF 60 pF 90 pF Ns setting No dbl / dbl Clock to Address Worst-Case Conformally coated Area Conformal Coating Jumper Configurations Table A-9. RCM4000 Jumper ConfigurationsHeader Description Pins Connected Factory Default RabbitCore RCM4000 Appendix B. Prototyping Board Current Measurement Headers RCM4000 Prototyping Board Features RabbitCore RCM4000 935 Mechanical Dimensions and Layout Power Supply Table B-1. Prototyping Board SpecificationsParameter Specification Signals Using the Prototyping Board Pin Pin Name Prototyping Board Use Measuring Current Draw Adding Other Components Analog Features RCM4000 only Table B-3. Positive A/D Converter Input Voltage Ranges3.1 A/D Converter Inputs Table B-4. Differential Voltage Ranges Mode Read Calibrate Thermistor Input3.3 A/D Converter Calibration Serial Port Header Default Use Alternate Use Table B-5. Prototyping Board Serial Port Configurations 4.1 RS-232 Table B-6. RCM3400 Prototyping Board Jumper Configurations Prototyping Board Jumper Configurations JP5 LN4IN-LN6IN 108 Appendix C. Power Supply Power SuppliesBattery-Backup Circuits 165 mA·h = 2.5 years Reset Generator User’s Manual 111 112 SMODE0 SMODE1 Index ADCALALL.C User’s Manual 115 116 Schematics