User`s guide

Table 2–2 (Cont.) AlphaPC64 Board Jumpers
Connector Pins Description
System Clock Functions
J3 4 21064A CPU clock divisor selection (AlphaPC64.4)
J3-1
sysclkdiv_h
J3-3
jmp_irq2
J3-5
jmp_irq1
J3-7
jmp_irq0 Divisor
In In In In 2
In In In Out 3
In In Out In 4
In In Out Out 5
In Out In In 6
In Out In Out 7
In Out Out In 8
In Out Out Out 9
(default)
Out In In In 10
Out In In Out 11
Out In Out In 12
Out In Out Out 13
Out Out In In 14
Out Out In Out 15
Out Out Out In 16
Out Out Out Out 17
Flash ROM
J16 3 Flash ROM update enable/disable connector (AlphaPC64.35)
Jumper from pin 1 to pin 2 disables flash ROM update.
Jumper from pin 2 to pin 3 enables flash ROM update (default).
2.2 AlphaPC64 Board Connectors
The module connectors are shown in Figure 2–3 and are described in
Table 2–3.
2–6 System Jumpers and Connectors