
Table 7: Tcl Commands Used with the Virtual JTAG Megafunction
DescriptionArgumentsCommand
Perform an IR shift operation to the
virtual JTAG instance specified by
the instance_index. Note that ir_
value takes a numerical argument.
-instance_index <instance_index>
-ir_value <numeric_ir_value>
-no_captured_ir_value
(1)
-show_equivalent_device_ir_dr_shift
(1)
Device virtual ir shift
Perform a DR shift operation to the
virtual JTAG instance.
-instance_index <instance_index>
-dr_value <dr_value>
-length <data_register_length>
-no_captured_dr_value
(1)
-show_equivalent_device_ir_dr_shift
-value_in_hex
(1)
Device virtual dr shift
Queries for all available program-
ming cables.
NONEGet hardware names
Selects the active device on the
JTAG chain.
-device_name <device_name>
-hardware_name <hardware_name>
Open device
Ends communication with the active
JTAG device.
NONEClose device
Obtains exclusive communication
to the JTAG chain.
-timeout <timeout>Device lock
Releases device_lock.NONEDevice unlock
Performs a IR shift operation.-ir_value <ir_value>
-no_captured_ir_value
Device ir shift
Performs a DR shift operation.-dr_value <dr_value>
-length <data register length>
-no_captured_dr_value
-value_in_hex
Device dr shift
Central to virtual JTAG megafunction are the device_virtual_ir_shift and device_virtual_dr_shift
commands. These commands perform the shift operation to each VIR/VDR and provide the address to the
SLD hub for the active JTAG datapath.
(1)
This argument is optional.
Virtual JTAG Megafunction (sld_virtual_jtag)
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Run-Time Communication with the Virtual JTAG Megafunction
16
2014.03.19
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