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RAM500 Memory Expansion Module
6.4.2
Host Clock Logic
The host board provides four SDRAM clocks to the memory expansion connector. The
frequency of the RAM500 CLKS is the same as the host board.
6.4.3
Serial Presence Detect (SPD) Data
This register is partially described for the RAM500 within the CPCI-6020 Single Board
Computer Programmer's Reference Guide. The register is accessed through the I
of the Harrier ASIC on the host board (CPCI-6020). The RAM500 SPD is software addressable
by a unique address as follows: The first RAM500 attached to the host board has an SPD
address of $AA. The second RAM500 attached to the top of the first RAM500 has an SPD
address of $AC.
6.5
RAM500 Connectors
RAM500 memory expansion modules are populated with one or two connectors. If the module
is to be used in tandem with a second RAM500 module, the "bottom" module will have two
connectors: one to mate with the CPCI-6020 host board (P1), and one to mate with the top
RAM500 module (J1). The top RAM500 module has only one connector, since it needs to mate
only with the RAM500 module directly underneath it and because an added connector on a
tandem RAM500 configuration would exceed the height limitations in some backplanes. If only
one RAM500 module is being used, a top module, single connector configuration is used.
A 4H plug and receptacle are used on both boards to provide a 4 millimeter stacking height
between dual RAM500 cards and the host board.
The following subsections specify the pin assignments for the connectors on the RAM500.
6.5.1
Bottom Side Memory Expansion Connector (P1)
The bottom side connector on the RAM500 is a 140-pin AMP 0.6 mm Free Height mating plug.
This plug includes common ground contacts that mate with standard AMP receptacle
assemblies or AMP GIGA assemblies with ground plates. A single memory expansion module
will have 1 bank of SDRAM for a maximum of 256 MB of memory. Attaching a second memory
module to the first module will provide 2 banks of SDRAM with a maximum of 512 MB.
Table 6-3 RAM500 Bottom Side Connector (P1) Pin Assignments
Pin
Signal
1
GND*
3
DQ00
5
DQ02
7
DQ04
9
DQ06
11
+3.3 V
120
CPCI-6020 CompactPCI Single Board Computer Installation and Use (6806800A51C)
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Signal
GND*
DQ01
DQ03
DQ05
DQ07
+3.3 V
Host Clock Logic
2
C interface
Pin
2
4
6
8
10
12
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