UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 22474

Schematic - How do I connect a group of bus signals to GROUND in Schematic Editor?

Description

I want to connect a group of bus signals D[15:0] to GROUND in a schematic. The "GND" symbol is available in general list, but it is for a single wire only, not for a bus. When the GND symbol is connected to a bus, the schematic DRC error reports a "bus width mismatch." How do I connect a bus to GROUND (or VCC)?

Solution

A bus can have all signals connected to GROUND with the use of an iterative instance. The following example shows how to connect a 16-bit bus to GROUND.

1. Connect a GND symbol to bus signal D[15:0].

2. Name the GND symbol as an iterative instance (for example, instname = gnd_ins(15:0)). This step actually generates 16 instances of the GND symbol.

Alternatively, in ISE 9.1i and later, use the Constant symbol and set all values to 0.

See (Xilinx Answer 16526): "Schematic - How do I use constants in a schematic design?"

AR# 22474
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article