Specifications ispGDX80VA
External Timing Parameters (Continued)
ispGDX80VA timings are specified with a GRP load
(fanout) of four I/O cells. The figure below shows the ∆
GRP Delay with increased GRP loads. These deltas
apply to any signal path traversing the GRP (MUXA-D,
OE, CLK/CLKEN, MUXsel0-1). Global Clock signals
which do not use the GRP have no fanout delay adder.
ispGDX80VA Maximum ∆ GRP Delay vs. I/O Cell Fanout
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0 4 10 20 30 40 50 60 70
I/O Cell Fanout
13