Istype 'buffer'
Non-inverter attribute

Syntax

signal_name [,signal_name] [PIN|NODE] ISTYPE 'buffer' ;

Use

Signal attribute 'buffer,' (along with its counterpart, 'invert,' to control output inversion) enforces the existence or non-existence of a hardware inverter at the device pin associated with the specified output signal. This is important because the state of the inverter affects a register's reset, preset, preload, and powerup behavior (as observed on the associated output pin).

The 'buffer' attribute indicates that the target architecture does not have an inverter between the associated flip-flop (if any) and the actual output pin.

Note: The XC9500 family does not have inverters between the macrocell flip-flop and the output pin.

Example

q0,q1,q2 pin istype 'buffer';
a0,a2 istype 'buffer';