Mips Technologies R4000 - Invalidate Requests; Update Requests

Chapter 12
370 MIPS R4000 Microprocessor User's Manual
Invalidate Requests
Figure 12-46 shows the format for an invalidate request, and Table 12-20
lists the encodings of SysCmd(4:0) for an external invalidate request.
SysCmd(4:0) are reserved on a processor invalidate request.
Figure 12-46 Invalidate Request SysCmd Bus Bit Definition
Table 12-20 Encoding of SysCmd(4:0) for External Invalidate Requests
Update Requests
Figure 12-47 shows the format for a SysCmd update request.
Figure 12-47 Update Request SysCmd Bus Bit Definition
Table 12-21 lists the encodings of SysCmd(4:0) for external update
requests. Table 12-22 lists the encodings of SysCmd(4:0) for processor
update requests. The remaining upper bits are the same for both processor
and external update requests.
SysCmd(4)
Processor Unacknowledged Invalidate or Update
Cancellation
0 Invalidate or Update cancelled
1 No cancellation
SysCmd(3:0) Reserved
100
0
8 7 5 4 03 2
Invalidate Request
Specific
(see table)
101
0
8 7 5 4 03 2
Update Request Specific
(see tables)