Teledyne LeCroy USB Chief - Users Manual - Manual (Page 104)

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Chief User’s Manual CATC Version 1.7
A bus condition definition starts with one of these assignments:
• file_speed=N (where N is a string ‘LOW’)
• reset=N (where N is a positive integer or string)
• suspend=N (where N is a positive integer)
• resume=N (where N is a positive integer).
Subsequent assignments after a packet’s starting assignment define the values of
particular fields within the packet. If a field is not defined, it is assumed to be 0.
Values are assumed to be decimal unless they are prefixed with 0x and then are
interpreted as hexadecimal. Values within a data block assignment are always
assumed to be hexadecimal and should not be prefixed by 0x.
Table 3: Support Keys for Defining Fields within a Packet
Key Code Format Description
Packet Starting Keys
pid 8 bits
or
string Use this as the first key of most packets (use frame for SOF packets). The key
should be assigned to a valid packet identifier string per the USB specification:
‘SETUP’, ‘IN’, ‘OUT’, ‘DATA0’, ‘DATA1’, ‘ACK’, ‘NAK’, ‘STALL’, or
‘PRE’. Optionally, you may assign this key a raw eight bit value to force an error
condition.
frame 11 bits
or
string This key creates a Start-of-Frame packet and generates a SOF PID as expected.
The key should be assigned a value of the frame number, ‘auto’, or ‘keep_alive’.
The string ‘auto’ instructs the USB Chief to increment the frame number
automatically. The string ‘keep_alive’ instructs the Analyzer to generate a
low-speed EOP in place of a SOF packet for traffic on a low-speed branch
(file_speed=LOW).
Bus Condition Keys
file_speed string Assign a string LOW to this key at the beginning of a ‘dot’ UTG file to indicate
low-speed traffic generation on a low-speed branch.
NOTE: The default file speed is FULL. Use this setting only when you want to
change the file speed setting to LOW.
reset positive
integer
or
string Assign a positive integer to this key that indicates the number of microseconds that
single-ended zeros (SE0) are driven onto the bus. This key can also be assigned
the string ‘LS_EOP’ to drive two low-speed bit times of SE0 followed by one bit
time of J.
suspend positive
integer Assign a positive integer to this key that indicates the number of microseconds of
idle and suspend after the previous packet (e.g. for ten milliseconds of suspend the
key should equal 13000). Note that suspend begins after 3 milliseconds of idle.
resume positive
integer Assign a positive integer to this key that indicates the number of microseconds of
K driven onto the bus. For a proper resume sequence this should be followed by
the condition reset=LS_EOP speed=LOW.
Keys for Packet Fields
speed string Assign the string ‘LOW’ or ‘FULL’. The default value is full-speed.
addr 7 bits Assign a value for the address field.
endp 4 bits Assign a value for the endpoint number field.
data ( aa bb ) Assign data bytes for the data field. Use this syntax: data=(12 34 56 78 90 AB CD
EF DC 13 40 78 11 CA 70 65). You can wrap bytes of the data field to the next
line.