Answers Database
XPLA2: Reserving device configuration pins using the fitter.
Record #7660
Product Family: Hardware
Product Line: R3000
Product Part: R3320
Product Version: XPLA2
Problem Title:
XPLA2: Reserving device configuration pins using the fitter.
Problem Description:
Urgency: Hot
General Description: How do I tell the fitter not to assign XPLA2 device configuration pins to I/O
signals?
Solution 1:
Most of the pins used in configuration of the device can also be used
as I/O, however, this complicates the design of the system or PCB.
Therefore, most designers would rather not have the pins involved in
the device configuration also assigned as I/O signals in the design.
To inform the fitter of the configuration mode used, a property can be
specified either in the ABEL/PHDL source code (Xilinx Solution 7563)
or in a control file (Xilinx Solution 7516).
Here is an example of the ABEL/PHDL property for the master serial
configuration mode (please note the spacing):
xpla property 'config_master_serial';
The fitter will then only assign the pins involved in the specified
configuration mode to I/O signals as a last resort - i.e., there are no
single-function I/O pins left.
End of Record #7660 - Last Modified: 10/08/99 13:14 |
