Chapter 9
214 MIPS R4000 Microprocessor User's Manual
9.1 Functional Overview
The R4000 processor has the following three types of resets; they use the
VCCOk, ColdReset*, and Reset* input signals.
• Power-on reset: starts when the power supply is turned on and
completely reinitializes the internal state machine of the
processor without saving any state information.
• Cold reset: restarts all clocks, but the power supply remains
stable. A cold reset completely reinitializes the internal state
machine of the processor without saving any state information.
• Warm reset: restarts processor, but does not affect clocks. A
warm reset preserves the processor internal state.
The operation of each type of reset is described in sections that follow.
Refer to Figures 9-1, 9-2, and 9-3 later in this chapter for timing diagrams
of the power-on, cold, and warm resets.
The Initialization interface is a serial interface that operates at the
frequency of the MasterClock divided by 256: (MasterClock/256). This
low-frequency operation allows the initialization information to be stored
in a low-cost EPROM.
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