Axcelerator Family FPGAs
v2.8
2-49
Buffer Module
Introduction
constraint is applied to a design, the synthesis tool inserts buffers as needed. The buffer module has been added to
the AX architecture to avoid logic duplication resulting from the hard fanout constraints. The router utilizes this logic
resource to save area and reduce loading and delays on medium-to-high-fanout nets.
Timing Models and Waveforms
Timing Characteristics
Figure 2-33 Buffer Module Timing Model
Figure 2-34 Buffer Module Waveform
Table 2-63 Buffer Module
Worst-Case Commercial Conditions VCCA = 1.425V, VCCI = 3.0V, TJ = 70°C
'–2' Speed
'–1' Speed
'Std' Speed
Parameter
Description
Min.
Max.
Min.
Max.
Min.
Max.
Units
Buffer Module Propagation Delays
tBFPD
Any input to output Y
0.12
0.14
0.16
ns
IN
OUT
GND
50%
GND
IN
VCCA
tBFPD