When generating intersheet references for a design, Capture uses a number of rules. The following set of guidelines will help you understand the details of how the intersheet references are generated and the points you need to keep in mind when running this command.
- Same name Off-page connector and Port
If an off-page connector and a port on the same page have the same name, no intersheet reference will be generated if another off-page connector or port of this name does not exist on another page. Also, two warning messages will be logged for the two un-connected signals. - Hanging Off-page Connectors
If a page contains two off-page connectors that are not connected to any pin (know as hanging off-page connectors), the intersheet references for these two off-page connector will be generated. However, if these hanging off-page connectors exist on different pages, the Intersheet references will not be generated. Also, two warning messages will be generated for the two un-connected signals. - Placing Intersheet References
When placing an intersheet reference, if the net symbol is a left port or off-page connector, the IREF will be displayed to the right of the graphical lines. If the net symbol is a right port or off-page connector, the IREF will be displayed to the left of the graphical lines. - Zone Information for Port
The zone information will not be displayed for a port that is inherited from a hierarchical pin. However, the zone information will be displayed if that signal is routed to another page. - Multiple Occurrence Port
If a port has multiple occurrences, then all the pages are appended to the IREF property for each occurrence of the port. - Bus Intersheet References
If a design has two buses and the hierarchical ports on these bus are EN2[7..0] and EN2[0..7], then one a intersheet reference will be displayed for each port, showing connectivity between the two buses. However, a warning will be displayed in the session log stating that the hierarchical port EN[7..0] appears twice on the same page.
If an off-page connector with the name A[15:0] is connected to a hierarchical port with the pin name A[0:3], then pin A0 on the hierarchical block is mapped to A15. This implies that the flatnet name for this pin is A15 and not A0.
If the off-page connector name is A[15:0], then intersheet references are generated on pages that have flatnets with names A0, A1 through A15.
If an off-page bus is placed on the top page of a design and another off-page bus on another page of the design, then the intersheet references will be generated only if the appropriate bus bits are specified on the off-page defined in the latter page of the design. To verify this, you need to open the property editor for each bus bit and check the schematic net and flatnet name defined for the bit. - Grid Display Option
If an off-page connector is connected to a hierarchical pin, in the Intersheet References grid display option, the grid information is not displayed with the port. - Port Page Number Append
The port page number will be added to an off-page connector intersheet reference only when the net connected to the off-page is connected to a part pin and a is port connected to the same net on the other page. - Generate Intersheet References
The following matrix provides a snapshot of the scenarios for Intersheet References:
|
Scenario |
IREF Generated |
|
Port is a bus, bus bit is a port or net name equals to bus bit |
YES |
|
Port is a bus, bus bit is an off-page connector or net name equals to bus bit |
NO |
|
Off-Page connector is a bus, bit is an off-page connector or net name equals to bus bit |
NO |
|
Port is a bus and a bus with same name exists |
YES |
|
Off-page connector is bus and a bus with same name exists |
YES |
|
Same port name exists on same page |
YES |
|
Same off-page connector name exists on the same page |
YES |