E-Cache Diagnostics Accesses - Sun Microsystems UltraSPARC-I User Manual

DC_addr: This 9-bit index <13:5> selects a tag/valid field (512 tags).
63
Figure A-19 D-Cache Tag/Valid Access Data Format (ASI 47
DC_tag: The 28-bit physical tag (PA<40:13> of the associated data).
DC_valid: The 2-bit valid field, one for each sub-block (32b block, 16b sub-block).
Bit<1> corresponds to the highest addressed 16 bytes, bit<0> to the
lowest addressed 16 bytes.
A.9 E-Cache Diagnostics Accesses
Separate ASIs are provided for reading (7E
and data.
Note: During E-Cache diagnostics accesses, the VA is passed through to PA
without page mapping. To prevent interference from instruction prefetching
modifying the E-Cache state, LDXA/STXA instructions which use these ASIs
should be on non physical cacheable pages.
A.9.1 E-Cache Data Fields
ASI 76 (WRITING) or 7E
16
VA<38:19>=0, VA<18:3>=EC_addr, VA<2:0>=0 (0.5 Mb)
VA<38:20>=0, VA<19:3>=EC_addr, VA<2:0>=0 (1 Mb)
VA<38:21>=0, VA<20:3>=EC_addr, VA<2:0>=0 (2 Mb)
VA<38:22>=0, VA<21:3>=EC_addr, VA<2:0>=0 (4 Mb)
VA<38:23>=0, VA<22:3>=EC_addr, VA<2:0>=0 (8 Mb UltraSPARC-II)
VA<38:24>=0, VA<23:3>=EC_addr, VA<2:0>=0 (16 Mb UltraSPARC-II)
Name: ASI_ECACHE_W (76
—
63
Figure A-20 E-Cache Data Access Address Format
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—
30 29
16
(READING), VA<63:41>=0, VA<40:39>=1,
16
), ASI_ECACHE_R (7E
16
—
01
41 40 39 38
A. Debug and Diagnostics Support
DC_tag
)
16
) and writing (76 ) the E-cache tags
16
)
16
EC_addr
24 23
Sun Microelectronics
DC_valid
2 1 0
—
3 2 0
315