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Serial Bus Protocol (SBP)
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As for the 'command' format, the 'data' format depends on the 'operation code'. A 'switch' item is used to
implement the formats for the different operation codes. The value of the operation code is however not
included in the packet (as it was for the 'command' format). In fact the operation code value is the value
of the operation code in the command packet. Therefore the 'operation_code' output parameter was
generated by the 'command' format. For the 'data' format, the 'operation_code' is an input parameter. In
fact, all output parameters generated by the corresponding 'command' format are used as input
parameters for the 'data' format when the Analyzer formats the 'data' block.
The implementation of the 'INQUIRE' command is shown in more detail. The format for the data of this
'INQUIRE' command depends on some more field values from the associated command block. These
fields are 'cmddt' and 'epvd'. Therefore these are input parameters for the 'data' defintion too, and their
values will be set to the values of the corresponding output parameters that are generated when the
corresponding 'command' block was formatted (in case the 'INQUIRE' command was formatted).
other input parameters
Beside the parameters generated by the corresponding 'command' format, there are also a few other
input parameters which can be used by the 'data' format definition:
Input parameter name
value
dataSize
This is the value of the 'data size' field of the
command ORB block of the corresponding
command. It holds the size of the data block in
number of bytes.
reading
This is the value of the 'direction' field of the
command ORB block of the corresponding
command. A value of 1 means that data is
transfered 'from' the SBP2 device (note that this
corresponds to write transactions from the SBP2
device point of view). A value of 0 means that data
is transferws 'to' the SBP2 device (read
transactions).
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