MVME51005E Single Board Computer Installation and Use 6806800A38B August 2008 Edition...
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Emerson reserves the right to revise this document and to make changes from time to time in the content hereof without obligation of Emerson to notify any person of such revision or changes.
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The safety precautions listed below represent warnings of certain dangers of which Emerson is aware. You, as the user of the product, should follow these warnings and all other safety precautions necessary for the safe operation of the equipment in your operating environment.
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Flammability All Emerson PWBs (printed wiring boards) are manufactured with a flammability rating of 94V- 0 by UL-recognized manufacturers. EMI Caution This equipment generates, uses and can radiate electromagnetic energy. It may cause or be susceptible to electromagnetic interference (EMI) if not installed and used with adequate EMI protection.
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Warning Emerson products with the CE marking comply with the EMC Directive (89/336/EEC). Compliance with this directive implies conformity to the following European Norms: EN55022 “Limits and Methods of Measurement of Radio Interference Characteristics of Information Technology Equipment”;...
About This Manual The MVME51005E Single Board Computer Installation and Use provides the information you will need to install and configure your MVME51005E Single Board Computer. It provides specific preparation and installation information and data applicable to the board. The MVME51005E will hereafter be referred to as the MVME5100.
Chapter 6, Pin Assignments, provides a listing of all connector and header pin assignments for the MVME5100. MVME51005E Single Board Computer Installation and Use (6806800A38B)
(for example, screen displays, reports), examples, and system prompts. , or represents the carriage return or Enter key. xvii MVME51005E Single Board Computer Installation and Use (6806800A38B)
16 bits, numbered 0 through 15, with bit 0 being the least significant. Word 32 bits, numbered 0 through 31, with bit 0 being the least significant. Double word 64 bits, numbered 0 through 63, with bit 0 being the least significant. xviii MVME51005E Single Board Computer Installation and Use (6806800A38B)
Peripheral Component Interconnect (PCI) Mezzanine Cards (PMCs) (installed on an MVME5100 board) ❏ RAM500 memory mezzanine modules (installed on an MVME5100 board) ❏ VME system enclosure ❏ System console terminal ❏ Disk drives (and/or other I/O) and controllers MVME51005E Single Board Computer Installation and Use (6806800A38B)
If the shipping carton(s) is/are damaged upon receipt, request that the carrier's agent be present during the unpacking and inspection of the equipment. Emerson strongly recommends that you use an antistatic wrist strap and a Use ESD conductive foam pad when installing or upgrading a system.
Installed For Front Panel Ethernet Port 2: (front No Jumpers Installed panel) J6, J20 Operation Mode Pins 1, 2 for PMC Mode (Set Both Jumpers) Mode Pins 2, 3 for SBC Mode* MVME51005E Single Board Computer Installation and Use (6806800A38B)
SBC mode (jumpers J4, J6, J10, J17 and J20). These are factory configured for the PMC mode. Verify all settings according to the previous table and follow the instructions below if applicable. MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100 is not the system controller and there is no global bus time-out elsewhere in the system. Note Software can also disable the bus timer by setting the appropriate bits in the Universe II VMEbus interface. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Module, for installation instructions. It is recommended that the memory mezzainine modules be installed prior to installing other board accessories, such as PMCs, IPMCs or transition modules. 2788 0406 Figure 1-1. MVME5100 Layout MVME51005E Single Board Computer Installation and Use (6806800A38B)
6. Insert the appropriate number of Phillips screws (typically 4) from the bottom of the MVME5100 into the standoffs on the PMC module and tighten the screws (refer to Figure 1-3). Figure 1-2. MVME5100 Installation and Removal From a VMEbus Chassis MVME51005E Single Board Computer Installation and Use (6806800A38B)
3. If the MVME5100 has already been installed in a VMEbus card slot, carefully remove it as shown in Figure 1-2 and place it with connectors P1 and P2 facing you. 4. Attach the four standoffs to the MVME5100. For each standoff: MVME51005E Single Board Computer Installation and Use (6806800A38B)
The PMCspan16E-010 PCI expansion module mounts on top of a PMCspan16E-002 PCI expansion module. To install a PMCspan-010 on your MVME5100, perform the following steps while referring to the figure on the next page: MVME51005E Single Board Computer Installation and Use (6806800A38B)
3. If the Primary PMC Carrier Module and MVME5100 assembly is already installed in the VME chassis, carefully remove it as shown in Figure 1-2 and place it with connectors P1 and P2 facing you. MVME51005E Single Board Computer Installation and Use (6806800A38B)
– If you intend to use the MVME5100 as system controller, it must occupy the left-most card slot (slot 1). The system controller must be in slot 1 to correctly initiate the bus-grant daisy-chain and to ensure proper operation of the IACK daisy-chain driver. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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RF emissions. Note Some VME backplanes (such as those used in Emerson Modular Chassis systems) have an auto-jumpering feature for automatic propagation of the IACK and BG signals. The step immediately below does not apply to such backplane designs.
SYSRESET# signal may be generated by toggling the switch to , or by a power- ABT/RST up reset, or by a watchdog timeout, or by a control bit in the Miscellaneous Control Register (MISC_CTL) in the Universe ASIC. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Parity disabled (no parity) ❏ Baud rate = 9600 baud (default baud rate at power-up) After power-up, the baud rate of the port can be reconfigured by using the debugger’s DEBUG Port Format (PF) command. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Initialize devices on the MVME5100 INITIALIZATION PowerOn Self-Test diagnostics POST Firmware-configured boot mechanism BOOTING so configured. Default is no bo Interactive, command-driven on-line PPC MONITOR debugger, when terminal connected. Figure 2-1. Boot-Up Sequence MVME51005E Single Board Computer Installation and Use (6806800A38B)
Appendix D, Related Documentation. ❏ A user interface or debug/diagnostics monitor that accepts commands from the system console terminal. When using PPCBug, you operate out of either the debugger directory or the diagnostic directory. MVME51005E Single Board Computer Installation and Use (6806800A38B)
After the debugger executes the command, the prompt reappears. However, depending on what the user program does, if the command causes execution of a user target code (that is, GO), then control may or may not return to the debugger. MVME51005E Single Board Computer Installation and Use (6806800A38B)
15. Initializes the read only memory controller with the speed of read only memory. 16. Enables the MPU's instruction cache. 17. Copies the MPU's exception vector table from 0xFFF00000 to 0x00000000. 18. Verifies MPU type. MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100. The structure for the board is shown in the following example: Board (PWA) Serial Number = MOT00xxxxxxx Board Identifier = MVME5100 Artwork (PWA) Identifier = 01-W3518FxxB MPU Clock Speed = 450 Bus Clock Speed = 100 MVME51005E Single Board Computer Installation and Use (6806800A38B)
This parameter specifies the maximum number of megabytes the bug is allowed to use. Allocation begins at the top of physical memory and expands downward as more memory is required until the maximum value is reached. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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NVRAM (PReP partition) header space will be initialized automatically during board initialization, but only if the PReP partition fails a sanity check. (Default) NVRAM header space will not be initialized automatically during board initialization. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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(GEV). Do not give boot priority to devices listed in the fw-boot-path GEV. (Default) Note When enabled, the GEV boot takes priority over all other boots, including Autoboot and Network Boot. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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“bootable” partition. That is then the partition that will be booted. Other acceptable values are 1, 2, 3 or 4. In these four cases, the partition specified will be booted without searching. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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The last location tested when PPCBug searches for a ROMboot module. (Default = 0xFFFFFFFC) Network Auto Boot Enable [Y/N] = N? The Network Auto Boot (NETboot) function is enabled. The NETboot function is disabled. (Default) MVME51005E Single Board Computer Installation and Use (6806800A38B)
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Memory Size Enable [Y/N] = Y? Memory will be sized for SelfTest diagnostics. (Default) Memory will not be sized for SelfTest diagnostics. Memory Size Starting Address = 00000000? The default Starting Address is 0x00000000. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Serial Startup Code Master Enable [Y/N]=N? Should the debugger fail to come up to a prompt, the last code displayed will indicate how far the initialization sequence had progressed before stalling. Serial Startup Code LF Enable [Y/N]=N? MVME51005E Single Board Computer Installation and Use (6806800A38B)
The configured value is written into the LSI1_TO register of the Universe chip. PCI Slave Image 2 Control = C0410000? The configured value is written into the LSI2_CTL register of the Universe chip. PCI Slave Image 2 Base Address Register = A0000000? MVME51005E Single Board Computer Installation and Use (6806800A38B)
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The configured value is written into the VSI2_CTL register of the Universe chip. VMEbus Slave Image 2 Base Address Register = 00000000? The configured value is written into the VSI2_BS register of the Universe chip. MVME51005E Single Board Computer Installation and Use (6806800A38B)
During this delay, you may press any key to prevent the execution of the startup command buffer. The default value of this parameter causes a startup delay of 5 seconds. Firmware Command Buffer: MVME51005E Single Board Computer Installation and Use (6806800A38B)
Block of Memory Search Breakpoint Insert Block of Memory Verify CACHE Modify Cache State Concurrent Mode CNFG Configure Board Information Block Checksum a Block of data CSAR PCI Configuration Space READ Access MVME51005E Single Board Computer Installation and Use (6806800A38B)
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I/O Control for Disk I/O Inquiry I/O Physical to Disk I/O “Teach” for Configuring Disk Controller Idle MPU Register Display Idle MPU Register Modify Idle MPU Register Set Load S-Records from Host MVME51005E Single Board Computer Installation and Use (6806800A38B)
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Macro Delete NOMAL Disable Macro Expansion Listing NOPA Printer Detach NOPF Port Detach NORB No ROM Boot NOSYM Detach Symbol Table NPING Network Ping Offset Registers Display/Modify Printer Attach PBOOT Bootstrap Operating System MVME51005E Single Board Computer Installation and Use (6806800A38B)
Flash memory will erase everything currently contained in Flash, including Caution the PPCBug debugger, if the target address addresses the bank in which it resides. Diagnostics The PPCBug hardware diagnostics are intended for testing and troubleshooting the MVME5100. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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IPMC712 or IPMC761 is mounted). The ISABRDGE test is only performed if an IPMC761 is mounted on the MVME5100. If the MVME5100 is operating in PMC mode (IPMC761 is not mounted), then the test suite is bypassed. MVME51005E Single Board Computer Installation and Use (6806800A38B)
IPMC mode). In PMC mode, it is fully backwards compatible with previous generation dual PMC products such as the MVME2300 and MVME2400. In the SBC mode, the MVME5100 is backwards compatible with the corresponding Emerson MVME712 or MVME761 transition board originated for use with previous generation single- board computer products, such as the MVME2600 and MVME2700.
The MVME5100 incorporates a BGA foot print that supports both the MCP7410 and the MCP75x processors. The maximum external processor bus speed is 100 MHz. Note The MCP7410 is configured to operate only with the PowerPC 60xbus interface. MVME51005E Single Board Computer Installation and Use (6806800A38B)
2 and 3. If PPCBug tries to write to those write-protected address areas when pins 2-3 on J16 are set, the command will simply not finish (i.e., erase sector function stops at $F4FF 0000). MVME51005E Single Board Computer Installation and Use (6806800A38B)
PMC front-panel keep-out area. In addition, LAN 1 Ethernet address is stored in the configuration area of the NVRAM specified by the Boot ROM and in SROM. MVME51005E Single Board Computer Installation and Use (6806800A38B)
AD16. When a standard PMC card (not the IPMC712 or IPMC761) is plugged into slot 1, its IDSEL assignment corresponds to the standard IDSEL pin J12-25 and shall be connected to AD16. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Any RAM500 memory size can be attached to the host board followed by any secondary RAM500 memory size for maximum Flexibility memory expansion flexibility. Functional Description The following sections describe the physical and electrical structure of the RAM500 memory expansion module. MVME51005E Single Board Computer Installation and Use (6806800A38B)
$AA. The second RAM500 attached to the host board has its SPD addressable at $AC. This dynamic address relocation of the RAM500 SPD shall be done using the bottom- side connector signal A1_SPD and A0_SPD. MVME51005E Single Board Computer Installation and Use (6806800A38B)
P1 connector on the module with the three holes and the J16 connector on the MVME5100 host board and press the two connectors together until they are firmly seated in place. Figure 5-2. RAM500 Module Placement on MVME5100 MVME51005E Single Board Computer Installation and Use (6806800A38B)
2 banks of SDRAM with a maximum of 1Gigabytes. Table 5-3. RAM500 Bottom Side Connector (P1)Pin Assignments GND* GND* DQ00 DQ01 DQ02 DQ03 DQ04 DQ05 DQ06 DQ07 +3.3V +3.3V DQ08 DQ09 DQ10 DQ11 MVME51005E Single Board Computer Installation and Use (6806800A38B)
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AMP that includes receptacles loaded with contacts for grounding circuits at 9 or 10 signal circuits. These ground contacts mate with grounding plates on both sides of the plug assemblies. MVME51005E Single Board Computer Installation and Use (6806800A38B)
The first RAM500 attached to the host board has has an SPD address of $AA. The second RAM500 attached to the top of the first RAM500 has an SPD address of $AC. MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100 Single Board Computer. The table below provides a brief description of each jumper and the appropriate setting(s) for proper board operation. Jumper Description Setting Default RISCWatch Header None (Factory Use Only) PAL Programming Header None (Lab Use Only) MVME51005E Single Board Computer Installation and Use (6806800A38B)
This connetor is used to provide an interface to the IPMC761 module signals and is located near J11. The pin assignments for this connector are as follows: Table 6-1. IPMC761 Connector Pin Assignments Assignment I2CSCL I2CSDA DB8# DB9# DB10# +3.3V +3.3V DB11# DB12# DB13# DB14# +3.3V MVME51005E Single Board Computer Installation and Use (6806800A38B)
This may cause the clock generation logic to set the local bus frequency to 83.33 MHz if necessary. PCI Expansion Connector (J25) Pin Assignments This connector is used to provide PCI/PMC expansion capability. The pin assignments for this connector are as follows: MVME51005E Single Board Computer Installation and Use (6806800A38B)
Mezzanine Cards (PMC). The pin assignments for these connectors are as follows. Table 6-4. PMC Slot 1 Connector (J11) Pin Assignments Assignment -12V INTA# INTB# INTC# PMCPRSNT1# INTD# Not Used Not Used MVME51005E Single Board Computer Installation and Use (6806800A38B)
Not Used TDRY# +3.3V STOP# PERR# +3.3V SERR# C/BE1# AD14 AD13 AD10 AD08 +3.3V AD07 Not Used +3.3V Not Used Not Used Not Used Not Used Not Used ACK64# +3.3V Not Used MVME51005E Single Board Computer Installation and Use (6806800A38B)
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Not Used +3.3V Not Used Not Used Not Used Not Used Not Used ACK64# +3.3V Not Used Assignment Reserved C/BE7# C/BE6# C/BE5# C/BE4# +5V (Vio) PAR64 AD63 AD62 AD61 AD60 AD59 AD58 AD57 MVME51005E Single Board Computer Installation and Use (6806800A38B)
The pin assignments for the P2 connector using the IPMC761 or the IPMC712 are listed in the following two tables: Row Z Row A Row B Row C Row D DB8# DB0# RD- (10/100) PMC2_1 (J24-1) DB1# RD+ (10/100) PMC2_3 (J24-3) DB9# DB2# RETRY# TD- (10/100) PMC2_4 (J24-4) MVME51005E Single Board Computer Installation and Use (6806800A38B)
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PMC2_1 (J24-1) DB1# PMC2_3 (J24-3) DB9# DB2# PMC2_4 (J24-4) DB3# VA24 AC Terminated PMC2_6 (J24-6) DB10# DB4# VA25 AC Terminated PMC2_7 (J24-7) DB5# VA26 PMC2_9 (J24-9) DB11# DB6# VA27 +12V (LAN) PMC2_10 (J24-10) MVME51005E Single Board Computer Installation and Use (6806800A38B)
The board’s dual 10 BaseT/100 BaseTx RJ45 connectors (J9 and J18) are located on the front plate. The connections provide two LAN connections (LAN1-J18 and LAN2-J9). The pin assignments for these connectors are as follows: Assignment MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100 provides the interface to the serial debug ports. The RJ45 connector is for COM1 and the 9-pin header is for COM2. The pin assignments for these connectors are as follows: Assignment GNDC GNDC Assignment MVME51005E Single Board Computer Installation and Use (6806800A38B)
The processor memory map configuration is under the control of the PHB and SMC portions of the Hawk ASIC. The Hawk adjusts system mapping to suit a given application via programmable map decoder registers. At system power-up or reset, a default processor memory map takes over. MVME51005E Single Board Computer Installation and Use (6806800A38B)
For an example of the CHRP memory map, refer to the following table. For detailed processor memory maps, including suggested CHRP- and PREP-compatible memory maps, refer to the MVME5100-Series Single Board Computer Programmer’s Reference Guide. MVME51005E Single Board Computer Installation and Use (6806800A38B)
3. The first 1MB of ROM/FLASH Bank A appears at this range after a reset if the rom_b_rv control bit is cleared. If the rom_b_rv control bit is set, this address maps to ROM/FLASH Bank B. MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100-Series Single Board Computer Programmer’s Reference Guide. VMEbus Memory Map The VMEbus is programmable. Like other parts of the MVME5100 memory map, the mapping of local resources as viewed by VMEbus masters varies among applications. MVME51005E Single Board Computer Installation and Use (6806800A38B)
The PIB supports flexible arbitration modes of fixed priority, rotating priority and mixed priority, as appropriate in a given application. Details on PCI arbitration can be found in the MVME5100-Series Single Board Computer Programmer’s Reference Guide. MVME51005E Single Board Computer Installation and Use (6806800A38B)
MVME5100. For details on interrupt handling, refer to the MVME5100-Series Single Board Computer Programmer’s Reference Guide. INT_ Processor (8529 Pair) MCP_ Hawk MPIC SERR_& PERR_ PCI Interrupts ISA Interrupts 11559.00 9609 Figure 7-2. MVME5100 Interrupt Architecture MVME51005E Single Board Computer Installation and Use (6806800A38B)
Table 7-5 shows which devices are affected by the various types of resets. For details on using resets, refer to the MVME5100-Series Single Board Computer Programmer’s Reference Guide. MVME51005E Single Board Computer Installation and Use (6806800A38B)
In little-endian mode, the PHB reverse-rearranges the address for PCI-bound accesses and rearranges the address for memory-bound accesses (from PCI). In this case, no byte swapping is done. MVME51005E Single Board Computer Installation and Use (6806800A38B)
In little-endian mode, however, software must take the byte-swapping effect of the Universe ASIC and the address reverse-rearranging effect of the PHB into account. For further details on endian considerations, refer to the MVME5100-Series Single Board Computer Programmer’s Reference Guide. MVME51005E Single Board Computer Installation and Use (6806800A38B)
5% to 90% Non-Condensing Physical Dimensions Height 233.4 mm (9.2 in.) Depth 160 mm (6.3 in.) Front Panel 261.8 mm (10.3 in.) Height 19.8 mm (0.8 in.) Width 14.8 mm (0.58 in.) Max. Component Height MVME51005E Single Board Computer Installation and Use (6806800A38B)
Front panel screws properly tightened. For minimum RF emissions, it is essential that the conditions above be implemented. Failure to do so could compromise the EMC compliance of the equipment containing the module. MVME51005E Single Board Computer Installation and Use (6806800A38B)
2. Check if the “system controller” function on wrong slot. the board is enabled per the instructions this manual. C. The “system Configure the system console terminal per the console” terminal instructions this manual. may be configured incorrectly. MVME51005E Single Board Computer Installation and Use (6806800A38B)
The date and time will be autoboot. incorrectly. displayed. B. There may be CAUTION: Performing the next step (env;d) some fault in the will change some parameters that may affect board hardware. your system’s operation. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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V. V. The debugger A. No apparent No further troubleshooting steps are required. is in system problems — mode; the board troubleshooting autoboots, or the is done. board has passed self tests. MVME51005E Single Board Computer Installation and Use (6806800A38B)
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2. Phone 1-800-222-5640. listed above; or the on-board cannot be debugging and corrected using diagnostic the steps given. firmware. TROUBLESHOOTING PROCEDURE COMPLETE MVME51005E Single Board Computer Installation and Use (6806800A38B)
The preferred temperature measurement location for a component may be: ❏ junction - refers to the temperature measured by an on-chip thermal device ❏ case - refers to the temperature at the top, center surface of the component MVME51005E Single Board Computer Installation and Use (6806800A38B)
Super I/O National Semiconductor Ambient Zilog (Z0853606 VSC) Ambient LSI Symbios LSA0564 609-0393602 Ambient Winbond W83C554F Case Lattice ispLSI 1032E 70LT D935B14 maximum temperature for reliable operation specified by the component manufacturer. MVME51005E Single Board Computer Installation and Use (6806800A38B)
An MVME5100 Single Board Computer and an IPMC761 I/O board was tested in an Emerson lab environment, and it was verified that the reliability of the components would not be compromised when operating in a maximum ambient temperature of 55 degrees C, if the required airflow of 400 LFM is provided.
Table C-1. Preparation We recommend 40-gage thermocouples for all thermal measurements. Larger gage thermocouples can wick heat away from the components and disturb air flowing past the board. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Machining a heatsink base reduces the contact area between the heatsink and the electrical component. You can partially compensate for this effect by filling the machined areas with thermal grease. The grease should not contact the thermocouple junction. MVME51005E Single Board Computer Installation and Use (6806800A38B)
Measure local component ambient temperature by placing the thermocouple downstream of the component. This method is conservative since it includes heating of the air by the component. Figure C-4 shows one method of mounting the thermocouple. MVME51005E Single Board Computer Installation and Use (6806800A38B)
C Thermal Analysis Tape thermocouple wire to top of component Thermocouple junction Air flow Figure C-4. Measuring Local Air Temperature MVME51005E Single Board Computer Installation and Use (6806800A38B)
Documents The Emerson Network Power - Embedded Computing publications listed below are referenced in this manual. You can obtain electronic copies of Emerson Network Power - Embedded Computing publications by contacting your local Emerson sales office. For documentation of final released (GA) products, you can also visit the following website: http://www.emersonnetworkpowerembeddedcomputing.com...
Peripheral Component Interconnect (PCI) Interface PCI Local Bus Specification, Revision 2.1 Specification PCI Special Interest Group http://www.pcisig.com Common Mezzanine Card Specification P1386 Draft 2.0 PCI Mezzanine Card Specification P1386.1Draft 2.0 IEEE Standards Department http://www.ieee.org MVME51005E Single Board Computer Installation and Use (6806800A38B)
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Primary SCSI Data Bus Width component temperature measurement ROM Boot Enable configurable items, MVME5100 base board SCSI bus reset on debugger startup configurations Secondary SCSI identifier MVME5100 ENV command configure parameters PPC1Bug parameters MVME51005E Single Board Computer Installation and Use (6806800A38B)
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PCI local bus performed by PPCBug processor (default) initialization process memory maps as performed by firmware MVME5100 Input/Output Interface VMEbus installation memory size RAM500 Memory Size Enable installation considerations Miscellaneous installing MPU initialization MVME51005E Single Board Computer Installation and Use (6806800A38B)
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PCI/PMC/Expansion install instructions Peripheral Support memory blocks PHB/SMC SPD addresses of Hawk ASIC top side connector PIB controller Real-Time Clock & NVRAM & Watchdog Timer pin assignments required equipment IPMC761 (J3) reset MVME51005E Single Board Computer Installation and Use(6806800A38B)
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VMEbus Interface reset VMEbus interface switches switches, MVME5100 front panel SYSFAIL* Winbond PCI/ISA bus bridge controller system console, connecting Winbond W83C553 system controller as PCI arbiter support MVME51005E Single Board Computer Installation and Use (6806800A38B)