User's Manual

15-34 Vol. 3
MACHINE-CHECK ARCHITECTURE
15.9.2.6 Memory Controller Errors
The memory controller errors are defined with the 3-bit MMM (memory
transaction type), and 4-bit CCCC (channel) sub-fields. The encodings for
MMM and CCCC are defined in
Table 15-14.
15.9.3 Architecturally Defined UCR Errors
Software recoverable compound error code are defined in this section.
15.9.3.1 Architecturally Defined SRAO Errors
The following two SRAO errors are architecturally defined.
• UCR Errors detected by memory controller scrubbing; and
• UCR Errors detected during L3 cache (L3) explicit writebacks.
The MCA error code encodings for these two architecturally-defined UCR
errors corresponds to sub-classes of compound MCA error codes (see
Table
I/O IO 10
Other transaction 11
NOTE:
* Local processor differentiates the processor reporting the error from other system components
(including the APIC, other processors, etc.).
Table 15-14. Encodings of MMM and CCCC Sub-Fields
Sub-Field Transaction Mnemonic Binary Encoding
MMM Generic undefined request GEN 000
Memory read error RD 001
Memory write error WR 010
Address/Command Error AC 011
Memory Scrubbing Error MS 100
Reserved 101-111
CCCC Channel number CHN 0000-1110
Channel not specified 1111
Table 15-13. Encodings of PP, T, and II Sub-Fields (Contd.)