Device Architecture
2- 134
Pr el iminar y v1 .7
Features Supported on Pro I/Os
Table 2-69 lists all features supported by transmitter/receiver for single-ended and differential
I/Os.
Table 2-69 Fusion Pro I/O Features
Feature
Description
Single-ended
and
voltage-
referenced transmitter
features
Hot insertion in every mode except PCI or 5 V input tolerant (these modes
use clamp diodes and do not allow hot insertion)
Activation of hot insertion (disabling the clamp diode) is selectable by I/Os.
Weak pull-up and pull-down
Two slew rates
Skew between output buffer enable/disable time: 2 ns delay (rising edge)
Five drive strengths
LVTTL/LVCMOS 3.3 V outputs compatible with 5 V TTL inputs (
"5 V OutputSingle-ended receiver features
Schmitt trigger option
ESD protection
Programmable delay: 0 ns if bypassed, 0.625 ns with '000' setting, 6.575 ns
with '111' setting, 0.85-ns intermediate delay increments (at 25°C, 1.5 V)
Separate ground planes, GND/GNDQ, for input buffers only to avoid
output-induced noise in the input circuitry
Voltage-referenced
differential receiver features
Programmable Delay: 0 ns if bypassed, 0.625 ns with '000' setting, 6.575 ns
with '111' setting, 0.85-ns intermediate delay increments (at 25°C, 1.5 V)
Separate ground planes, GND/GNDQ, for input buffers only to avoid
output-induced noise in the input circuitry
CMOS-style
LVDS,
BLVDS,
M-LVDS, or LVPECL
transmitter
Two I/Os and external resistors are used to provide a CMOS-style LVDS,
BLVDS, M-LVDS, or LVPECL transmitter solution.
Activation of hot insertion (disabling the clamp diode) is selectable by I/Os.
Weak pull-up and pull-down
Fast slew rate
LVDS/LVPECL differential
receiver features
ESD protection
Programmable delay: 0.625 ns with '000' setting, 6.575 ns with '111'
setting, 0.85-ns intermediate delay increments (at 25°C, 1.5 V)
Separate input buffer ground and power planes to avoid output-induced
noise in the input circuitry