Sun Microsystems UltraSPARC-I - Page 326

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A. Debug and Diagnostics Support
Figure A-9 I-Cache Tag/Valid Field Data Format (ASI 67
16
)
Undefined: The value of these bits are undefined on reads and must be masked
off by software.
IC_valid: The 1-bit valid field
IC_tag: The 28-bit physical tag field (PA<40:13> of the associated instructions)
A.7.3 I-Cache Predecode Field
ASI 6E
16
, VA<63:14>=0, VA<13>=IC_set, VA<12:5>=IC_addr, VA<4:3>=IC_line,
VA<2:0>=0
Name: ASI_ICACHE_PRE_DECODE
Figure A-10 I-Cache Predecode Field Access Address Format (ASI 6E
16
)
IC_set: This 1-bit field selects a set (2-ways).
IC_addr: This 8-bit index (i.e. addr <12:5>) selects an IC_Line.
IC_line: For LDDA accesses, this 2-bit field selects a pair of pre-decode fields in a
64-bit-aligned instruction pair. For STXA accesses, the least significant bit
is ignored. The most significant bit selects four pre-decode fields in a 128-
bit-aligned instruction quad.
Figure A-11 I-Cache Predecode Field LDDA Access Data Format (ASI 6E
16
)
Figure A-12 I-Cache Predecode Field STXA Access Data Format (ASI 6E
16
)
63 0
Undefined
IC_valid
IC_tag
353637
7
8
Undefined
63 230
—
—
IC_set
IC_addr
121314 45
IC_line
63 0
Undefined
IC_pdec 0
834
IC_pdec 1
7
63 0
Undefined
IC_pdec 2
834
IC_pdec 3
7
IC_pdec 1
IC_pdec 0
12 11
16 15
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