Tektronix Socket 7 TMS109A, Instruction Manual

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Acquiring and Viewing Disassembled Data
TMS 109A Socket 7 Microprocessor Support
2–11
Table 2–2: Meaning of special characters in the display (cont.)
Character or string displayed Meaning
?? This notation will be placed in a mnemonic field if the
disassembler views the operand invalid for the instruction.
For example, there is not a control register named “CR7”.
Thus if the operand byte would indicate the register “CR7”,
“(??)” will be placed to the right of the instruction string:
“MOV CR7,EAX (??)”.
<more>
For Software Mode, if there are more than eight lines of text
to be displayed for a cycle due to out-of-order fetching, the
eighth line will have the text string “<more>” displayed at the
right. This text WILL overlay any other text on the line (it has
the highest priority).
Logic analyzer software does not allow more than 32 channels in each channel
group. Therefore, two channel groups are used to acquire 64-bit wide Socket 7
microprocessor data.
To handle the display of disassembled data from both data groups, the
disassembler may display more than one line for each data sample. For samples
with two display lines, data displayed under the Data column of the first line is
from the Data_Lo group (D31-0); data displayed under the Data column of the
second line is from the Data group (D63-32). Figure 2–3 on page 2–14 shows
examples of multiple display lines used to display Data_Lo and Data group
information.
The disassembler synthesizes the A2-A0 signals.
Aborting Lengthy Disassembly. When acquiring data from two microprocessors,
the disassembler might take a long time to display disassembled data. This could
be caused by the combination of selections in the Trace Processor and Other
Processor fields in the Disassembly property page (Disassembly Format
Definition overlay).
An example where this might occur is when the Trace Processor field is set to
DUAL, and the Other Processor field is set to Suppress. If the acquisition data
only contains data from the Primary microprocessor, then the disassembler might
take a long time to display disassembled cycle types or instruction mnemonics.