Personal Computer User Manual

RAM500 Connectors
D-10 Computer Group Literature Center Web Site
D
*Common GND pins mate to a GIGA assembly with a ground plate. The
GIGA assembly is an enhanced electrical performance receptacle and plug
from AMP that includes receptacles loaded with contacts for grounding
circuits at 9 or 10 signal circuits. These ground contacts mate with
grounding plates on both sides of the plug assemblies.
Top Side Memory Expansion Connector (J1)
The top side memory expansion connector is a 140-pin AMP 0.6mm Free
Height receptacle. This receptacle includes common ground contacts that
mate with standard AMP plug assemblies or AMP GIGA assemblies with
ground plates. A single memory module will have one bank of SDRAM
for a maximum of 256MB of memory. The pin assignments for this
connector are as follows:
125 DQMB1 SCL 126
127 SDA A1_SPD 128
129 A0_SPD MEZZ1_L 130
131 MEZZ2_L GND 132
133 GND SDRAMCLK1 134
135 SDRAMCLK3 +3.3V 136
137 SDRAMCLK4 SDRAMCLK2 138
139 GND* GND* 140
Table D-4. RAM500 Top Side Connector (J1)
Pin Assignments
1 GND* GND* 2
3 DQ00 DQ01 4
5 DQ02 DQ03 6
7 DQ04 DQ05 8
9 DQ06 DQ07 10
11 +3.3V +3.3V 12
Table D-3. RAM500 Bottom Side Connector (P1)
Pin Assignments (Continued)