Owner`s manual

Table 4–5 (Cont.): Machine Check Parameters
Parameter Description
AT. bits<20:18> The current setting of the E-box
(the MP-chip’s execution unit or main
data path) access-type latch, relat-
ing to the last (or upcoming) mem-
ory reference.
Value (binary) Interpretation
000 Read
001 Write
010 Modify
011 Unassigned, MP-chip
error
100 Unassigned, MP-chip
error
101 Address
110 Variable bit
111 Branch
DL, bits<17:16> The current setting of the E-box
data length latch, relating to the
last (or forthcoming) memory refer-
ence.
Value (binary)
Interpretation
00 Byte
01 Word
10 Long, F_Floating
11 Quad, D_Floating,
G_Floating
Opcode, bits<15:8> The opcode (second opcode, if two-
byte) of the instruction being pro-
cessed at the time of the fault.
Unused, bits<7:4>
4–38 VAX 6000 Model 500 Mini-Reference