AR# 1801: XC7300: MR (Master Reset) Pin can optionally be used as an input
AR# 1801
XC7300: MR (Master Reset) Pin can optionally be used as an input
Description
The XC7318, XC7336, XC7354 and XC73144 devices have a Master Reset pin, which can optionally be specified as a user input.
The default behavior for the MR pin in the above devices is the Master Reset functionality. This will invoke the full initialization of the respective 7300 device when pulsed. If you don't require this reset operation except for at powerup, then you can optionally use this pin as an input.
解决方案
1
To use the MR pin as an input, you must specify the MRINPUT global attribute.
In a schematic: --------------- Attach the attribute MRINPUT=ON to any input buffer in the design. The name of the attribute is MRINPUT and the value/description is ON. This will disable the Master Reset functionality of the MR pin, and allow it to be used as a regular input pin during normal operation.
2
In an ABEL file: ----------------
Use the following XEPLD Property statement in the Declarations section of the Abel file.