Motorola Single Board Computer, MVME5100 manual CSC0L

5

Pin Assignments

Table 5-3. Memory Expansion Connector Pin Assignments (Continued)

Pin		Assignment		Pin
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

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.

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