Achronix Speedster22i User Macro Guide - Manual (Page 19)

I/O Cells IOPAD
Speedster Macro Cell Library www.achronix.com PAGE 2
IOPAD
Bidirectional I/O Pad
din
dout
pad
oe
IOPAD
Figure 1-1: IOPAD Logic Symbol
IOPAD is an asynchronous I/O pad with active‐high clock enable.
Table 1-3: Ports
Name Type Description
pad Bidirectional device pad.
din Data input.
dout Data output. The dout pin is driven with the value present on the pad pin.
Table 1-4: Parameters
Parameter Defined Values Default Value
location
iostandard “LVCMOS18”
drive
slew
keepmode
hysteresis
open_drain “true”, “false” “false”
pvt_comp “none”, “own” “none”
odt “off”, “on” “off”
termination “50”, “60”, “75”, “100”, “120”, “240” “50”
Table 1-5: Output Function Table
din oe pad
Table 1-6: Input Function Table
pad dout
inout
input
output
“<pad_location>” ““
See Table 1‐1
"2", "4", "6", "8", "12", "16" "16"
“fast”, “slow” “slow”
"pullup", "pulldown", "none" “none”
"none", "schmitt" “none”
X 0 Z
0 1 0
1 1 1
0 0
1 1
X X
Z X