Specifications

174 Chapter 8—Device Symbol Editing
not important, but the internal pins must have the same name. Once the port
connector is placed in a circuit its reference name is important, it must be the
same as the parent's pin name.
 See “Bus Pin Name Matching” on page 54 for more information.
IMPORTANT: The Bus Port Connector does not export all the signals in the attached bus,
only
the ones for which is has explicit Bus Internal pins
Bus Port Connector Example
For this example, assume that the following simple device has a bus pin called
CONTROL containing internal pins CLK, MEMW/, and MEMR/.
To create the corresponding Bus Port Connector using the symbol editor, follow
these steps:
1) Select the New command in the File menu and choose the Device Symbol
document type.
2) From the Options menu select “Add Pins...”
3) Enter the following string
PORT[CLK MEMW/ MEMR/]
See “Adding Sequential Pin Names” on page 149 for Add Pins syntax for
ranges of numbered signals, etc.
You should now see a pin list like the following:
4) For each bus internal pin set the pin function as appropriate, i.e. the
opposite
of the function of the parent pin. We will assume that the CLK
LW Reference.bk Page 174 Monday, December 15, 2003 5:59 PM