SROM
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B-3
B
SROM
The RAM5500 memory expansion module contains a single 3.3V, 256 x 8,
serial EEPROM device (AT24C02). The serial EEPROM provides SPD
storage of the module memory subsystem configuration. The RAM5500
SPD is software addressable by a unique address.
Clocks
The host board provides one SDRAM clock to the memory expansion
connector. The frequency of the RAM5500 CLKS is the same as the host
board. This clock is used to generate the on-board SDRAM clocks using a
phase lock loop zero delay clock driver.
RAM5500 Module Installation
To upgrade or install a RAM5500 module, refer to and proceed as follows:
1. Attach an ESD strap to your wrist. Attach the other end of the ESD
strap to the chassis as a ground. The ESD strap must be secured to your
wrist and to ground throughout the procedure.
2. Perform an operating system shutdown. Turn the AC or DC power off
and remove the AC cord or DC power lines from the system. Remove
the chassis or system cover(s) as necessary for access to the VME
boards.
3. Carefully remove the MVME5500 from its VME card slot and lay it
flat, with connectors P1 and P2 facing you.
4. Inspect the RAM5500 module that is being installed on the
MVME5500 host board to ensure that standoffs are installed in the
four mounting holes on the module.
5. With standoffs installed in the four mounting holes on the RAM5500
module, align the standoffs and the P1 connector on the module with
