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Chapter 5 - Memory Expansion Module (XVME-956/101)
PROGRAM
VOLTAGE
JUMPERING
Wl, 6
W2, 7
W3, 8
W4, 9
5V
1/2
5/6, 8/9
Open
3/5, 4/6
5V
1/2
5/8, 6/9
Open
3/5, 4/6
12V
1/2
2/3, 4/5, 6/9
Open
4/6
12V
1/2
2/3, 4/5, 6/9, 7/8
Open
4/6
12V
1/2
2/3, 4/5, 6/9, 7/8
Open
4/6
12V
1/2
2/3, 4/5, 6/9, 7/8
Open
1/3, 4/6
FUNCTION
PIN
From PC bus +12 volts
1
To Vpp (W2 and W7, pin 3)
2
Ground
3
Default is 1/2
5.4.3.3 F l a s h EPROM Programming Voltage
If
5 volt Flash EPROMs are used, you can connect the programming voltage by jumpering W2 or
W7
as indicated in Table 5-11. T h e programming voltage is then gated to the device with software, as part
of the programming algorithm.
Table 5-11. EPROM Programming Voltage
If 12 volt Flash EPROMs are used, you will have to supply the 12 volt programming voltage while
programming the devices. This can come from the PC bus, or an external power supply. T o use the
PC bus voltage, connect J3, pins 1 and 2. To use an external power supply, connect the 12 volts to J3,
pin 2, with the return to J3, pin 3. A f t e r programming the devices, you can remove the 12 volt supply,
or the jumper from J3 1/2. Table 5-12 shows a summary of connector J3.
Table 5-12. Summary of Connector (J3)
5-12
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