9. Initialization Interface
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.
Copyright 1996, MIPS Technologies, Inc. -- 21 MAR 96
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