12.9 System Interface Commands and Data Identifiers
Command and Data Identifier Syntax
System interface commands and data identifiers are encoded in 9 bits and are transmitted on the SysCmd bus from the processor to an external agent, or from an external agent to the processor, during address and data cycles. Bit 8 (the most-significant bit) of the SysCmd bus determines whether the current content of the SysCmd bus is a command or a data identifier and, therefore, whether the current cycle is an address cycle or a data cycle. For System interface commands, SysCmd(8) must be set to 0. For System interface data identifiers, SysCmd(8) must be set to 1.
Copyright 1996, MIPS Technologies, Inc. -- 21 MAR 96
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