Personal Computer User Manual

5-6 Computer Group Literature Center Web Site
Pin Assignments
5
Note PIN 130, 131, MEZZ1_L, MEZZ2_L, configures the board’s
local bus frequency. If a single mezzanine is attached to the
board, MEZZ1_L will be pulled down on the board. If a second
mezzanine is attached on-top to the first, MEZZ2_L will be
pulled down on the board. This may cause the clock generation
logic to set the local bus frequency to 83.33 MHz if necessary.
105 A04 A03 106
107 A02 A01 108
109 +3.3V +3.3V 110
111 A00 CS_C0_L 112
113 CS_E0_L GND 114
115 CS_C1_L CS_E1_L 116
117 WE_L RAS_L 118
119 GND GND 120
121 CAS_L +3.3V 122
123 +3.3V DQMB0 124
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 5-3. Memory Expansion Connector Pin Assignments (Continued)
Pin Assignment Pin