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  3. AR# 4434: Foundation, Spartan: Why can MD1 be placed in schematic, but causes error in implementation?

AR# 4434

Foundation, Spartan: Why can MD1 be placed in schematic, but causes error in implementation?

Description

Keyword: foundation, spartan, mode pins, MD1

Urgency: Standard

General Description:
In the Foundation design entry tools, MD1 can be placed in the design,
but when implementing the design, an error is generated, regarding the
illegal use of the mode pins.

Solution

In Foundation 1.4, the XC4000E part library is used to target Spartan
parts. The XC4000E part has more than 1 mode pin and allows the use
of these pins after configuration. The Spartan part has 1 mode pin (MD0).
This single mode pin is a dedicated pin, preventing user use of the pin
after configuration. Any design intending to use the Spartan mode pin
after configuration must be modified to use general user I/O for that function.
AR# 4434
Date 06/13/2002
Status Archive
Type General Article