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HARDWARE REFERENCE
3.2.3
i960 Jx/Hx CPU Counter/Timers
The i960 Jx and Hx processors are equipped with two on-chip counter/timers. These timers are clocked
at the CPU clock rate which does not correspond exactly with the CPU Module Frequency Switch
settings. Use Table 3-3 to determine the exact CPU clock frequency.
3.2.4
CPU Module V
The V
Switch (switch position 1 in Table 3-2) enables/disables V
PP
on the CPU module. It is recommended that this switch remains set to OFF (the default setting from the
factory). When V
ROM if the power sequencing of +5V and +12V is not correct.
3.3
CPU MEMORY MAP
As indicated in Figure 3-2, the memory map is organized to take advantage of the i960 Cx, Hx, and Jx
processors' bus sizing capabilities. Memories and I/O devices are described in the sections following
the figure.
3-4
Table 3-3. i960 Jx/Hx CPU Clock Rates
CPU Frequency
Switch Setting
16 MHz
20 MHz
25 MHz
33 MHz
40 MHz
Switch
PP
is enabled (switch in ON position), the processor may not be able to boot from
PP
CPU Clock Frequency
16.11 MHz
20.05 MHz
25.06 MHz
33.41 MHz
40.09 MHz
to the boot Flash ROMs located
PP
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