
DATA
State Data
(without tags)
1 7 7
191
205
1 4 4 9 9
State Data (with either
Status Bytes.
In state tagging mode, the tags indicate whether a given row
time or state tags)
of the data is a data line, a count (tag) line, or a prestore line.
System Commands
HP
16518
612
Programming Reference
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.
Machine 1 Machine 2 Pod 5 Pod4 Pod 3 Pod 2 Pod
Status
Status
Data
Data
Data
Data
Data
Status
Status
Data
Data
Data
Data
Data
Status
Status
Data
Data
Data
Data
Data
Status
Status
Data
Data
Data
*The headings are not a part of the returned data.
Data
Data
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 3
Bit 2
Information bvte
0
0
Acquisition Data
0
1
1
0
Prestore Data
1
1
Invalid
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.
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