Mentor v8.6_4 用户手册
Command Dictionary
Add Clocks
FastScan and FlexTest Reference Manual, V8.6_4
2-47
Add Clocks
Tools Supported: FastScan and FlexTest
Scope: Setup mode
Usage
ADD CLocks off_state primary_input_pin...
Description
Adds clock primary inputs to the clock list.
The Add Clocks command adds scan or non-scan clock pins to the clock list for
proper scan operation. The tool considers any signal to be a clock if it can change
the state of a sequential element, including system clocks, sets, and resets.
proper scan operation. The tool considers any signal to be a clock if it can change
the state of a sequential element, including system clocks, sets, and resets.
Pins that you add to the clock list must have an off–state. The off-state of a clock
pin is the value on the pin which results in the clock inputs of sequential memory
elements becoming inactive. For edge-triggered devices, the off–state is the value
on the pin that results in placing their clock inputs at the initial value of a
capturing transition. The tool also considers set and reset lines as clock lines. You
can constrain a clock pin to its off-state in order to suppress its use as a capture
clock during the ATPG process. The constrained value must be the same as the
clock off-state or an error occurs. If you add an equivalence to the clock list, the
tool adds all of its equivalent pins to the clock list as well.
pin is the value on the pin which results in the clock inputs of sequential memory
elements becoming inactive. For edge-triggered devices, the off–state is the value
on the pin that results in placing their clock inputs at the initial value of a
capturing transition. The tool also considers set and reset lines as clock lines. You
can constrain a clock pin to its off-state in order to suppress its use as a capture
clock during the ATPG process. The constrained value must be the same as the
clock off-state or an error occurs. If you add an equivalence to the clock list, the
tool adds all of its equivalent pins to the clock list as well.
Arguments
•
off_state
A required literal that specifies the pin value that inactivates the sequential
memory elements. The off_state choices are as follows:
memory elements. The off_state choices are as follows:
0 — A literal specifying that the off-state value is 0.
1 — A literal specifying that the off-state value is 1.
•
primary_input_pin
A required repeatable string that lists the primary input pins that you want to
assign as clocks. The list of primary input pins must all have the same
off_state.
assign as clocks. The list of primary input pins must all have the same
off_state.