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DATA
State Data
(without tags)
177
191
205
State Data (with either
time or state tags)
System Commands
Status Bytes. In normal state mode, only the least significant bit (bit 1) is
used. When bit 1 is set, this means that there has been a sequence level
transition.
Information Bytes. In state acquisition with no tags, data is obtained from
the target system with each clock and checked with the trace specification.
If the state matches this specification, the data is stored, and is placed into
the memory.
1 Machine 2 Pod 5 Pod4 Pod 3 Pod 2 Pod l*
Status
Status
Data
Status
Status
Data
Status
Status
Data
Status
Status
Data
*The headings are not a part of the returned data.
Status Bytes. In state tagging mode, the tags indicate whether a given row
of the data is a data line, a count (tag) line, or a prestore line.
Bit 2 is the Data vs. Count bit. Bit 3 is the Prestore vs. Tag bit. The two
bits together show what the corresponding Information bytes represent.
Bit 2
0
0
Acquisition Data
1
0
Count
1
0
Prestore Data
1
Invalid
1
If Bit 2 is clear, the information contains either actual acquisition data as
obtained from the target system (if Bit 3 is clear), or prestore data (if Bit 3
is set). If Bit 2 is set and Bit 3 is clear, this row's bytes for the pods
assigned to this machine contain tags. If Bit 2 and Bit 3 are set, the
corresponding Information bytes are invalid and should be ignored. Bit 1
is used only when Bit 2 is clear. Whenever there has been a sequence level
transition Bit 1 will be set, and otherwise will be clear.
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
Data
HP 16528/16538
Programming Reference
Data
Data
Data
Data
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