Chapter 12
368 MIPS R4000 Microprocessor User's Manual
Table 12-16 Block Write Request Encoding of SysCmd(2:0)
Table 12-17 Doubleword,Word, or Partial-word Write Request Data Size
Encoding of SysCmd(2:0)
†The only time the processor sets this bit is if a Hit Writeback causes the processor
to execute a write request (see Cache Write Policy in Chapter 11).
SysCmd(2) Cache Line Replacement Attributes
0 Cache line replaced
1 Cache line retained
†
SysCmd(1:0) Write Block Size
0 4 words
1 8 words
2 16 words
3 32 words
SysCmd(2:0) Write Data Size
0 1 byte valid (Byte)
1 2 bytes valid (Halfword)
2 3 bytes valid (Tribyte)
3 4 bytes valid (Word)
4 5 bytes valid (Quintibyte)
5 6 bytes valid (Sextibyte)
6 7 bytes valid (Septibyte)
7 8 bytes valid (Doubleword)
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