IGLOO nano Low Power Flash FPGAs
Revision 17 2-5
Figure 2-2 • V2 Devices – I/O State as a Function of VCCI and VCC Voltage Levels
Region 1: I/O buffers are OFF
Region 2: I/O buffers are ON.
I/Os are functional but slower because
VCCI / VCC are below specification. For the
same reason, input buffers do not meet
VIH / VIL levels, and output buffers do not
meet VOH/VOL levels.
Min VCCI datasheet specification
voltage at a selected I/O
standard; i.e., 1.14 V,1.425 V, 1.7 V,
2.3 V, or 3.0 V
VCC
VCC = 1.14 V
Region 1: I/O Buffers are OFF
Activation trip point:
V
a
= 0.85 V ± 0.2 V
eactivation trip point:
V
d
= 0.75 V ± 0.2 V
Activation trip point:
V
a
= 0.9 V ± 0.15 V
Deactivation trip point:
V
d
= 0.8 V ± 0.15 V
V
CC
= 1.575 V
Region 5: I/O buffers are ON
and power supplies are within
specification.
I/Os meet the entire datasheet
and timer specifications for
speed, VIH / VIL , VOH / VOL , etc.
Region 4: I/O
buffers are ON.
I/Os are functional
but slower because V
CCI
is below specification. For the
same reason, input buffers do not
meet VIH / VIL levels, and output
buffers do not meet VOH / VOL levels.
where VT can be from 0.58 V to 0.9 V (typically 0.75 V)
VCCI
Region 3: I/O buffers are ON.
I/Os are functional; I/O DC
specifications are met,
but I/Os are slower because
the VCC is below specification.