User`s manual
Table 3 (Cont.) Alpha PCI 64–275 Board Jumpers
Connector Pins Description
Board Clock Functions
J3 4 21064A CPU clock divisor selection.
J3-1
sysclkdiv
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
Divisor 9 is used for 275 MHz (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
12