Motorola MVME197LE user manual Flash Memory, Onboard Dram, Battery Backup RAM and Clock

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Functional Description

BOOT ROM

Currently a socket (socket will be removed from module in later board revisions) for a 32-pin PLCC/CLCC ROM/EPROM referred to as BOOT ROM or DROM (Download ROM) is provided. It is organized as a 128K x 8 device, but as viewed from the processor it looks like a 16K x 64 memory. This memory is mapped starting at location $FFF80000, but after a local reset it is

4also mapped at location 0, providing a reset vector and bootstrap code for the processor. The DR0 bit in the General Control Register (GCR) of the PCCchip2 must be cleared to disable the BOOT ROM memory map at 0.

FLASH Memory

Up to 1MB of FLASH memory is available on the board. FLASH memory works like EPROM, but can be erased and reprogrammed by software. It is organized as 32 bits wide, but to the processor it looks as 64 bits wide. It is mapped at location $FF800000. Reads can be of any size, including burst transfers, but writes are always 32 bits wide, regardless of the size specified for the transfer. For this reason, software should only use 32-bit write transfers. This memory is controlled by the BusSwitch, and the memory size, access time, and write enable capability can be programmed via the ROM Control Register (ROMCR) in the BusSwitch. The FLASH memory can be accessed from the processor bus only. It is not accessible from the local peripheral bus or VMEbus.

Onboard DRAM

The MVME197LE onboard DRAM (2 banks of 32MB memory, one optionally installed) is sized at 32MB using 1M x 4 devices and configured as 256 bits wide. The DRAM is four-way interleaved to efficiently support cache burst cycles. The DRAM is controlled by the DCAM and ECDM, and the map decoders in the DCAM can be programmed through the I2Cbus interface in the ECDM to accommodate different base address(es) and sizes. The onboard DRAM is not reset by a local peripheral bus reset. Refer to the DCAM and ECDM chapters in the MVME197LE, MVME197DP, and MVME197SP Single Board Computers Programmer’s Reference Guide for detailed programming information.

Battery Backup RAM and Clock

The MK48T08 RAM and clock chip is used on the MVME197LE. This chip provides a time of day clock, oscillator, crystal, power fail detection, memory write protection, 8KB of RAM, and a battery in one 28-pin package. The clock provides seconds, minutes, hours, day, date, month, and year in BCD 24-hour

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User’s Manual

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Contents MVME197LE MVME197LE/D2Restricted Rights Legend Preface Document TerminologyBIT Related Documentation Document Title Motorola Publication NumberPage Page Safety Summary Safety Depends on YOU Contents Appendix a List of Figures Xii List of Tables Xiv Introduction General DescriptionFeatures OteCharacteristics Specifications SpecificationsMVME197LE Specifications Cooling Requirements Equipment Required FCC ComplianceSupport Information Unpacking Instructions Hardware PreparationHardware Preparation and Installation VMEbus Connector P1 Configuration Switch S1 General Information Configuration SwitchesSwitch S1 S1-1 to S1-8 OFF -- All Ones Factory Configuration Connectors Installation InstructionsSwitch S6 MVME197LE Module Installation System Considerations MVME197LE/D2 Hardware Preparation and Installation Reset Switch S3 Controls and IndicatorsAbort Switch S2 Processor Bus Memory Map Front Panel Indicators DS1-DS6Memory Maps Processor Bus Memory Map Address Range Devices Accessed Port Size Local Devices Memory MapDetailed I/O Memory Maps 108 BusSwitch Register Memory Map100 110Memory Maps Ecdm CSR Register Memory Map ECDM0 ECDM1 ECDM2 ECDM3 ADDR/REGISTERDcam I2C Base Address = $C0 default Offset Dcam I2C Register Memory MapOperating Instructions VMEchip2 Memory Map Sheet 1 OffsetOperating Instructions Global Access BUS Watchdog Timeout Prescaler Adjust VMEchip2 Memory Map Sheet 2Operating Instructions VMEchip2 Memory Map Sheet 3 Operating Instructions VMEchip2 Memory Map Sheet 4 VMEchip2 Gcsr Base Address = $FFF40100Operating Instructions PCCchip2 Memory Map Printer PE Interrupt Control Register $FFF42033 Printer Fault Interrupt Control Register $FFF42031Printer SEL Interrupt Control Register $FFF42032 Printer Busy Interrupt Control Register $FFF42034Base Address Is $FFF45000 Cirrus Logic CD2400 Memory Map Offsets Size AccessCirrus Logic CD2401 Serial Port Memory Map Data Bits Address D31 D16 D15 12. MK48T08 BBRAM, TOD Clock Memory Map Accesses may be 8-bit or 32-bit, but not 16-bit11 C710 Scsi Memory Map Address Range Description Size BytesData Bits Address Function 13. Bbram Configuration Area Memory Map14. TOD Clock Memory Map 000000470476 BBRAM, TOD Clock Memory Map0460 01-W3869B03A VMEbus Accesses to the Local Peripheral BusVMEbus Memory Map 5000Multi-MPU Programming Considerations Local Reset OperationSoftware Initialization User’s Manual MC88110 MPU MVME197LE Functional DescriptionData Bus Structure Functional Description Mezzanine Address Bus Bus Data Bus 256 BusSwitchMC88110 Address Data MUX Address Memory ArrayOnboard Dram Battery Backup RAM and ClockFlash Memory Serial Port Interface VMEbus InterfaceInterfaces Printer Interface Ethernet InterfaceScsi Interface Programmable Tick TimersPeripheral Resources Scsi TerminationLocal Peripheral Bus Timeout Watchdog TimerProcessor Bus Timeout Interrupt SourcesMVME197LE/D2 Functional Description EIA-232-D Interconnections Pin Signal Signal Name and Description Number Mnemonic Table A-1. EIA-232-D InterconnectionsRing Indicator RI is sent by the modem to User’s Manual Figure A-1. Middle-of-the-Road EIA-232-D Configuration Figure A-2. Minimum EIA-232-D Connection Index NumericsIN-2 IN-3 Index
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