VXI Technology, Inc.
32
SMP7500 Programming
Trace RAM Control Register - Read and Write
D15-D10 Modules
Installed
D15 is for module 5, D10 is for module 0. Set to 0 if the module is
installed or set to a 1 if not installed. These bits are set to 0 at power
on. By setting a 1, the SMIP
II
Interface PCB will generate DTACK
for any read or write cycles to the memory space of the uninstalled
plug-in modules.
D9-D4
Modules used in trace
mode
D9 is for module 5, D4 is for module 0. Set to 1 if the module is used
in trace mode, set to 0 if not in trace mode.
D3-D2 Unused
Data written to these bits have no effect. The value written is read
back.
D1 LOOP
ENABLE
1 = enabled, 0 = disabled. If enabled, the trace resumes at the start of
active RAM and continues from there. If disabled, the trace stops at
the end of active RAM and clears the TRACE ENABLE bit.
D0 TRACE
ENABLE
1 = enabled, 0 = disabled. If the LOOP ENABLE bit is set and the
end of active trace RAM is reached, this bit will not be reset.
Busy Trigger Control Register - Read and Write
D15-D8 TTLTRIG
Select
Sets the TTLTRIG Line or Lines, which are configured as outputs,
and will toggle at the de-assertion of a Board Busy condition sent by
the plug-in modules. D15 corresponds to TTLTRIG7, D14 to
TTLTRIG6, … and D8 to TTLTRIG0. Setting a bit to a 1 enables the
trigger line, setting a bit to a 0 disables the corresponding line. All
bits are set to 0's when either a soft or a hard reset is received by the
module.
D7-D6 Unused
Data written to these bits have no effect. The value written is read
back.
D5-D0
Busy Trigger Enable
Enables the Board Busy signals received from the plug-in modules to
generate a trigger condition on the TTL Trigger Bus. D5 corresponds
to Board Busy Module 5, D4 to Board Busy Module 4, … and D0 to
Board Busy Module 0. Setting a bit to a 1 enables the generation of a
Trigger condition, setting a bit to a 0 disables the corresponding line.
All bits are set to 0's when either a soft or a hard reset is received by
the module.
Software can be written to enable the last board updated to generate
the TTLTrigger condition, alerting any other instruments that the
plug-in modules' relays have settled. Alternatively, all of the plug-in
modules may be enabled to generate the TTLTrigger condition.
Trigger Advance Register - Write Only
D15-D0 Unused
The act of writing to this location causes a Trace Advance event to
occur in the module. The specific data written to these bits has no
effect.
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