Sun Enterprise 6500/5500/4500 Systems Reference Manual

CPU/Memory+ Boards

Each CPU/Memory+ board supports up to two UltraSPARC II modules and 16 SIMM slots for memory.

The CPU/Memory+ board includes an Address Controller (AC+), 8 bit-sliced Data Controllers (DC+s), a Bootbus Controller, onboard devices (including a Flash PROM, and SRAM), two CPU processor slots, and slots for two memory banks of 8 SIMMs each.

Removing a Board

Removing a Board from a Powered-On System

Caution - Caution -

Remove a board from a powered-on system only after the ASR software has disabled the board. If a board has not been disabled by the ASR software, then the operating system should be halted and the system powered off prior to board removal. See Chapter 11, Powering Off and On and then see "Removing a Board From a Powered-Off System".

  1. Ensure that the board has been disabled by the ASR software. See "Hot-Plug Feature".

    There are two possible results:

    • The three LEDs on the board are not lit (board has no power).

    • The outer two green LEDs are not lit and the middle yellow LED is lit (board in low power mode).

  2. Use a Phillips #1 screwdriver to unlock the board.

    Insert the screwdriver into each quarter-turn access slot (the slots are on the left and right sides of the board) and turn the arrow to the unlocked position (Figure 3-3).

    Figure 3-3 Unlocking and Locking Quarter-Turn Access Slots


  3. Pull the ends of both extraction levers outward simultaneously to unseat the board centerplane connector from the centerplane receptacles (Figure 3-4).

    Figure 3-4 CPU/Memory+ Board


  4. If a board is not immediately replaced, a load board (Enterprise 6500 systems only) or a filler panel (Enterprise 4500 and 5500 systems only) must be installed in its place.

    See "Filler Panels and Load Boards".

Removing a Board From a Powered-Off System

  1. Use a Phillips #1 screwdriver to mechanically release the board from the system card cage.

    Insert the screwdriver into each quarter-turn access slot (the slots are located on the left and right sides of the board front panel) and then turn a quarter turn so that the arrow points to the unlocked position (Figure 3-3).

  2. Pull the ends of both extraction levers outward simultaneously to release the board from the centerplane receptacles (Figure 3-4).

  3. If a board is not immediately replaced, a load board (Enterprise 6500 systems only) or a filler panel (Enterprise 4500 and 5500 systems only) must be installed in its place.

    See "Filler Panels and Load Boards".

Installing a Board

Board Slot Selection

Note -

It is suggested that CPU/Memory+ boards be installed in the front slots, and I/O+ and Disk boards be installed in the rear slots because of cabling. Should the need arise, however, any of these three board types can be placed in any board slot, with the exception of slot 1. Slot 1 should be used for an I/O+ board because it is the only slot connected to the onboard SCSI devices.

The first CPU/Memory+ board is placed in slot 0, followed sequentially by all remaining even numbered slots. If there are boards remaining, they can be installed sequentially in odd numbered slots, if available, in the system rear (with the exception of slot 1 as noted above). See Figure 3-5 and Figure 3-6 for board slot locations.

For CPU/Memory+ boards being placed in the rear of the system, ensure that the component side is up. If the boards are placed in the front of the system, ensure that the component side is down (Figure 3-7).


Figure 3-5 Enterprise 6500 Board Locations


Figure 3-6 Enterprise 5500/4500 Board Locations


Cooling and Power Issues

There should be one power/cooling module (PCM) for every two boards to adhere to cooling and power requirements. The PCMs must be installed adjacent to populated board slots to ensure the fan in the PCM can cool the respective boards.

Note -

All empty board slots in Enterprise 4500 or 5500 systems must have a filler panel installed to ensure proper cooling and for EMI protection. All empty slots in Enterprise 6500 systems must have load boards installed.

Inserting a System Board

  1. Carefully insert the board (component side down if in front; component side up if in the rear) in the proper slot in the card cage, ensuring that the board does not slip out of the left and right card guide (Figure 3-7).

    Figure 3-7 Board Replacement


  2. Ensure that both extraction levers are in the insert position (arrow pointing outward), and that the quarter-turn access slots are unlocked (arrow indicates unlocked position) as you slide the board toward the centerplane receptacles (Figure 3-3 and Figure 3-4).

    The board will not seat fully unless the levers are in this starting position and both quarter-turn access slots are unlocked.

    Caution - Caution -

    DO NOT FORCE any board into a slot; it can cause damage to the board and system. The board should insert and seat smoothly. If it binds, remove the board and inspect the card cage slot for any obvious obstructions. Also inspect both the board and the centerplane for bent pins or other damage.

  3. Push the board into the card cage, then simultaneously press both extraction levers to seat the board on the centerplane.

    Pushing both levers simultaneously avoids twisting the board and bending the connector pins, and mates the board centerplane connector to the matching receptacle on the centerplane. Do not press on board front panel to seat it--doing so will damage the connector pins.

  4. Mechanically lock the board to the system chassis by inserting a Phillips #1 screwdriver into each quarter-turn access slot and then turning to the locked position (Figure 3-3).

  5. Once the board has been installed, a message similar to the following will be displayed on the monitor (if the system is powered on):

    Example depicts screen output when a new CPU/Memory+ board has been hot-plugged into slot 6 of an operating Enterprise system:

    NOTICE: CPU Board Hotplugged into Slot 6
    NOTICE: Board 6 is ready to remove

    This screen output indicates that the board has been detected by the system and is in the low power mode. Additionally, any subsequent prtdiag(1M) output would include information for board slot 6. Again, note that the system will not use the new board until the system is rebooted.

  6. Reboot the system now or schedule a later time to reboot when system disruption will be minimized.

UltraSPARC II Modules

Each CPU/Memory+ board has four connectors for UltraSPARC II modules (up to two modules per board, two connectors per module). For each module, there is a connector with 144 pins and a connector with 288 pins (Figure 3-8).

Figure 3-8 UltraSPARC II Module Connectors


Handling Precautions

The following precautions should be exercised when handling UltraSPARC II modules:

Removing a Module

Each module is locked to the main board with a single standoff and is connected to the main board by two connectors. The pins within the connectors are compressed to the corresponding board mating surfaces by a metal compression bar which, when secured with screws, compresses the module connector pins to the board mating surfaces (Figure 3-9).

Figure 3-9 Ultra SPARC Module Connector Detail


  1. Use the procedures in "Removing a Board", to remove the applicable CPU/Memory+ board.

    Caution - Caution -

    The heatsinks on the UltraSPARC II modules may be hot. Use caution when removing or installing UltraSPARC II modules and avoid contact.

  2. Use a 3/32 Hex driver to loosen all screws on each of the compression connectors on the module to be removed (three screws for the 288-pin connector, two screws for the 144-pin connector) (Figure 3-8).

  3. Lift the module straight up, off the board mating surface and the single standoff that locks the module to the board.

    Use pressure applied with fingers to assist in removing module from standoff (Figure 3-10).

    Figure 3-10 UltraSPARC II Module Removal and Replacement


  4. Place the module in an antistatic bag.

Installing a Module

To maximize performance when installing UltraSPARC II modules on a CPU/Memory+ board, use all CPU 0 connectors on the lowest numbered slot to the highest numbered slot. If there are modules remaining, use the CPU 1 connectors in the same order.

Note -

Screws on the UltraSPARC II modules must be tightened to 6 inch-pounds. The torque screwdriver that came with your system is set to this specification.

  1. Take the UltraSPARC II module out of the protective packaging and inspect for dust on the connectors.

    If necessary, clean the connectors with a dry, stiff toothbrush.

  2. Remove the applicable CPU/Memory+ board as indicated in "Removing a Board".

  3. Inspect the board module mating surface and connectors. If they require cleaning, use a dry, stiff toothbrush to remove debris.

    Note -

    There are miniature silver alignment pins on the compression connectors which, when the module is properly seated, align with related receptacles on the mating surfaces of the CPU/Memory+ board. In addition, there is a gold standoff mounted on the CPU/Memory+ board opposite the module's smaller board connector. This acts as a standoff for the module as well as an alignment pin.

  4. Holding the module by the edges, align the module over the two board receptacles (use the single standoff and the alignment pins on the module compression connector as a guide). See Figure 3-9 and Figure 3-10.

  5. Rest the module on the board standoff, aligning the compression connectors with the screws.

    Firmly but gently press the module straight down until the standoff post snaps into place and the module connectors are fully seated.

  6. Using the torque screwdriver provided with your system, partially tighten the five 3/32 hex screws:

    1. Partially tighten the screws just until they touch the compression connectors in order, beginning with screw 1.

    2. Tighten the five screws an additional one-half turn in the same tightening sequence.

    3. Finish the module installation by tightening all the screws to 6 inch-pounds in the same tightening sequence. See Figure 3-11.

      Caution - Caution -

      Do not over torque or under torque the screws. Excessive force can warp the connector. Insufficient force can cause an incomplete electrical connection.

      Figure 3-11 Tightening Compression Connector Screws


  7. Use the procedures in "Installing a Board", to replace the applicable CPU/Memory+ board.

Memory Modules (SIMMs)

The CPU/Memory+ board has 16 SIMM sockets, which are divided into two banks of 8 SIMMs each, Bank 0 and Bank 1. Bank 0 and Bank 1 SIMMs occupy alternate slot locations; Bank 0 SIMMs are in the even numbered slots, and Bank 1 SIMMs are in odd numbered slots (Figure 3-12).

Three types of SIMMs (Table 3-1) can be used in Bank 0 and Bank 1.

Table 3-1 SIMM vs. DRAM



8 Mbyte  

1 Mbyte x4 

32 Mbyte 

4 Mbyte x4 

128 Mbyte 

16 Mbyte x4 

Figure 3-12 SIMM Slot Numbers


Removing a Memory Module

  1. Remove the CPU/Memory+ board from which the SIMM is to be removed. See "Removing a Board".

  2. Attach a wrist strap and place an antistatic surface next to the system.

  3. Use the system error messages to locate the slot (Figure 3-12) for the SIMM you need to replace.

  4. Eject the faulty SIMM by pressing down on the ejection levers on both sides of the SIMM connector (Figure 3-13).

    Figure 3-13 Ejecting a SIMM


  5. Holding the SIMM by its edges, remove it from the slot and place it on an antistatic surface.

Installing a Memory Module


All banks must have the same size SIMMs, however, SIMMs from different manufacturers are interchangeable in a single bank if the SIMMs all have the same capacity and speed. Sort the SIMMs into banks of eight using the same size SIMMs.

Maximizing Performance

The following guidelines will result in optimal memory interleaving across boards for performance. These guidelines are for optimal performance and are not requirements for a functional system. The guidelines apply to systems with no SIMMS installed and when adding SIMMs to a system; if you are adding SIMMs, you may need to move some SIMMs to meet the guidelines.

  1. Install one bank on each board before installing the second bank on any board.

    It does not matter whether the first bank is bank 0 or bank 1.

  2. Begin with the largest density banks first (128 Mbyte SIMMs), continue with medium sized banks (32 Mbyte SIMMs), and finish with the smallest banks (8 Mbyte SIMMs).

  3. If there is remaining memory, start filling the second banks on the boards in the same order as the first banks.


  1. Place the CPU/Memory+ board on which the SIMM is to be installed on an antistatic mat.

  2. Carefully remove the new SIMM from its protective packaging and place it on an antistatic surface.

    The bag that the SIMM is packed in makes a good antistatic surface.

  3. Press down on the ejector levers at both ends of the SIMM connector slot that will receive the new SIMM.

    The connector slot will not accept the SIMM unless the levers are in the insert position (Figure 3-14).

  4. Align the SIMM with the slot.

    Hold the SIMM by its edges and orient it so that the two notches at the bottom of the SIMM line up with the two tabs in the SIMM connector (Figure 3-14).

  5. Place your thumbs on the top edge of the SIMM and push the SIMM firmly into its connector (Figure 3-15).

  6. Lock the SIMM in place by pushing both ejector levers into the upright position (Figure 3-15).

  7. Install the CPU/Memory+ board and detach the wrist strap.

    See "Installing a Board".

  8. As you reboot the system, watch for the system banner to verify that the new memory is recognized by the system.

    Figure 3-14 Orienting a SIMM


    Figure 3-15 Installing a SIMM