The RAM5500 is a dedicated memory expansion module designed to enhance the memory capacity of the MVME5500 Single Board Computer (SBC), delivering reliable performance and seamless integration with the host system.
The RAM5500 is a dedicated memory expansion module designed to enhance the memory capacity of the MVME5500 Single Board Computer (SBC), delivering reliable performance and seamless integration with the host system.
1. Core Function & Memory Specifications
1.1 Capacity & Error Correction
Total Added Capacity: 512 MB (expands the MVME5500’s memory subsystem)
Memory Type: SDRAM (controlled by the MVME5500’s Marvell GT-64260B system controller)
Error Correction/Detection:
Single-Bit Error Correction (ECC)
Double-Bit Error Detection
ECC Calculation: Performed over 72-bit data blocks
1.2 Configuration & SPD Data
SPD (Serial Presence Detect):
Stored in an on-board I²C SROM (Serial Read-Only Memory)
Contains configuration data for the module’s two memory banks
Used by the MVME5500’s memory controller to auto-configure the expanded memory
SPD Standard: Complies with JEDEC SPD definitions
SPD Address: Software-accessible at address $A2
Reference Document: For detailed configuration guidelines, refer to the MVME5500 Single Board Computer Programmer’s Reference Guide (V5500A/PG)
2. Hardware Components
2.1 SROM (Serial EEPROM)
Device Type: 3.3V serial EEPROM (model: AT24C02)
Storage Capacity: 256 x 8 bits
Function: Stores SPD data for the RAM5500’s memory subsystem configuration
Addressability: Software-accessible via a unique address (enables distinct identification by the host)
2.2 Clocks
Clock Source: Provided by the MVME5500 host board (delivered to the RAM5500 via the expansion connector)
Clock Frequency: Matches the host board’s native frequency
Clock Generation: On-board phase-locked loop (PLL) zero-delay clock driver generates SDRAM-specific clocks (ensures synchronization with the host)
2.3 Physical Connection & Power
Connector Type: 140-pin AMP 4mm Free Height plug connector (interfaces with the MVME5500 host board)
Power Supply: Draws +3.3V power directly from the host board via the connection connector (no external power required)
3. RAM5500 Module Installation Procedure
Follow these steps to safely install or upgrade the RAM5500 module on the MVME5500:
ESD Protection PreparationAttach an ESD (Electrostatic Discharge) strap to your wrist. Secure the other end of the strap to the system chassis (as a ground reference). Maintain this connection throughout the installation to prevent electrostatic damage.
System Power Down
Perform a proper operating system shutdown.
Turn off AC/DC power to the system.
Disconnect the AC power cord or DC power lines from the system.
Remove the system chassis cover(s) to access the VME card slots.
Remove the MVME5500 Host BoardCarefully extract the MVME5500 from its VME card slot. Lay the board flat on a static-free surface, with connectors P1 and P2 facing you.
Inspect the RAM5500 ModuleVerify that standoffs are pre-installed in all four mounting holes on the RAM5500 module (standoffs ensure proper alignment and mechanical stability).
Align the RAM5500 with the MVME5500Align the RAM5500’s standoffs and P1 connector with the corresponding mounting points and connector socket on the MVME5500 host board. Gently press the module into place until the connector is fully seated.
Secure the RAM5500 with ScrewsFlip the MVME5500-RAM5500 assembly over. Use four short Phillips screws to fasten the RAM5500’s standoffs to the host board (tighten to a moderate torque—do not over-tighten to avoid damaging the boards).
Reinstall the Host BoardInsert the MVME5500 (with the attached RAM5500) back into its original VME card slot. Ensure the host board is fully seated in the backplane connectors (avoid bending or damaging connector pins).
System Reassembly & Power-Up
Replace the system chassis cover(s).
Reconnect the AC power cord or DC power lines.
Turn on the system power and verify proper boot (confirm memory recognition via the system BIOS or diagnostic tools).
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