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Symbols
Analyzing the Intel 80386DX/DXL
2-4
The HP E2444A configuration software sets up symbol tables on the
logic analyzers. The tables contain alphanumeric symbols which
identify data patterns or ranges. Additional labels have been defined in
the format specification menu to make triggering on specific
80386DX/DXL cycles easier. Four of the defined labels are:
•
The "STAT" label, which displays 11 status lines.
•
The "BE" label, which monitors BE0# to BE3# . These lines
indicate valid bytes of the 32-bit data bus during specific transfers.
•
The "SIZE" label, which indicates the size of the transfer on the
data bus (16-bit or 32-bit transfer).
•
The "HALT" label, which differentiates between a HALT cycle
caused by executing the HALT instruction and a shutdown
caused by protection fault while attempting to process a double
fault.
Figures 2-4 and 2-5 show the symbol tables for the STAT and BE
labels. Table 2-1 lists the bits assigned to the STAT label. Table 2-2
lists the Status Label encoding for all types of 80386DX/DXL
microprocessor cycles.
Figure 2-4. Symbol Table for the STAT Label
80386DX/DXL Preprocessor Interface
HP E2444A
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