CPCI-810 User’s Manual
3-1
Revision 1.1, June 2001
CHAPTER 3
HARDWARE
3.1
SDRAM
The CPCI-810 is equipped with 64 Mbytes of SDRAM. The memory is made up of nine 64 Mbit (8M
x 8) devices. The extra eight bits are for ECC data. Memory may be expanded by adding up to 128
Mbytes of SDRAM to the 144 pin SoDIMM socket for a maximum of 196 Mbytes. The SDRAM is
accessible by the processor and the PCI bus.
The CPCI-810 uses 72-bit SDRAM with ECC or 64-bit SDRAM without ECC. SDRAM memory bus
requires a four-beat data burst. The memory controller unit (MCU) of the CPCI-810 supports SDRAM
burst lengths of four. A burst length of four enables seamless read/write bursting of long data streams
as long as the MCU does not cross the page boundary. Page boundaries are naturally aligned 2 Kbyte
blocks. 72-bit SDRAM with ECC running at 100 MHz allows a maximum throughput of 800 Mbytes
per second.
16 Mbyte, 64 Mbyte, and 128 Mbyte SDRAM devices are supported. The MCU keeps four pages open
simultaneously. Simultaneously open pages allow for greater performance for sequential access,
distributed across multiple internal bus transaction.
3.1.1
Upgrading SDRAM
The CPCI-810 is equipped with 64 Mbytes of SDRAM with ECC mounted on the card. The memory
may be expanded by inserting an additional 16 Mbyte to 128 MByte module into the 144 pin SoDIMM
socket. Only 144 pin +3.3V SDRAM modules with or without ECC rated for 100 MHz operation
should be used on the CPCI-810.
3.1.2
SDRAM Configurations Installation and Removal of Memory Modules
Installation or removal of DIMMs on the CPCI-810 is a simple procedure and requires no special tools.
The CPCI-810 should be removed from the host system before its memory configuration is changed,
and care must be taken to avoid static discharge while contacting the board. A properly connected
grounding strap should be worn while installing or removing memory modules on the CPCI-810
adapter.
Memory modules are removed by rotating the latches located on each end of the SoDIMM socket
outward, away from the module. As the latches are moved outward, the module will be ejected from the
socket.
To install a memory module, first identify its proper orientation. Each module is keyed with a pair of
notches in the card edge of the PC board that correspond to tabs in the socket. With the correct
orientation established and the latches in their outward position, begin to slide the module into the
socket. The two card edge corners of the module mate with the slots in each latch first. By pressing the
module and socket together, the module should snap into the socket. Check that the latches are in their
fully closed (inward) position.
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