Compaq AlphaServer DS20 Service Manual Page 77

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Error Registers 3-7
3.4
Cbox Read Register
The Cbox Read Register is read 6 bits at a time. Table 3-4 shows the ordering
from LSB to MSB. The register is read only by PALcode and is an element in the
CPU or System Uncorrectable Machine Check Error Logout frame.
Table 3-4 Cbox Read Register
Name Description
C_SYNDROME_1
<7:0>
Syndrome for the upper QW in the OW of victim that was
scrubbed.
C_SYNDROME_0
<7:0>
Syndrome for the lower QW in the OW of victim that was
scrubbed.
Bits Error status
00000 Either no error, or error on a speculative load, of a
Bcache victim read due to a Dcache/Bcache miss.
00001 BC_PERR (Bcache tag parity error)
00010 DC_PERR (duplicate tag parity error
00011 DSTREAM_MEM_ERR
00100 DSTREAM_BC_ERR
00101 DSTREAM_DC_ERR
0011X PROBE_BC_ERR
01000 Reserved
01001 Reserved
01010 Reserved
01011 ISTREAM_MEM_ERR
01100 ISTREAM_BC_ERR
01101 Reserved
C_STAT<4:0>
1XXXX DOUBLE_BIT_ERROR
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