12.3 System Interface Protocols

Master and Slave States

When the R4000 processor is driving the SysAD and SysCmd buses, the System interface is in master state. When the external agent is driving the SysAD and SysCmd buses, the System interface is in slave state.

In master state, the processor asserts the signal ValidOut* whenever the SysAD and SysCmd buses are valid.

In slave state, the external agent asserts the signal ValidIn* whenever the SysAD and SysCmd buses are valid.

Copyright 1996, MIPS Technologies, Inc. -- 21 MAR 96

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