Altera Cyclone IV - Page 487

Chapter 1: Cyclone IV Device Datasheet 1–41
Glossary
December 2016 Altera Corporation Cyclone IV Device Handbook,
Volume 3
V
V
CM(DC)
DC common mode input voltage.
V
DIF(AC)
AC differential input voltage: The minimum AC input differential voltage required for switching.
V
DIF(DC)
DC differential input voltage: The minimum DC input differential voltage required for switching.
V
ICM
Input common mode voltage: The common mode of the differential signal at the receiver.
V
ID
Input differential voltage swing: The difference in voltage between the positive and
complementary conductors of a differential transmission at the receiver.
V
IH
Voltage input high: The minimum positive voltage applied to the input that is accepted by the
device as a logic high.
V
IH(AC)
High-level AC input voltage.
V
IH(DC)
High-level DC input voltage.
V
IL
Voltage input low: The maximum positive voltage applied to the input that is accepted by the
device as a logic low.
V
IL (AC)
Low-level AC input voltage.
V
IL (DC)
Low-level DC input voltage.
V
IN
DC input voltage.
V
OCM
Output common mode voltage: The common mode of the differential signal at the transmitter.
V
OD
Output differential voltage swing: The difference in voltage between the positive and
complementary conductors of a differential transmission at the transmitter. V
OD
= V
OH
– V
OL
.
V
OH
Voltage output high: The maximum positive voltage from an output that the device considers is
accepted as the minimum positive high level.
V
OL
Voltage output low: The maximum positive voltage from an output that the device considers is
accepted as the maximum positive low level.
V
OS
Output offset voltage: V
OS
= (V
OH
+ V
OL
) / 2.
V
OX (AC)
AC differential output cross point voltage: the voltage at which the differential output signals
must cross.
V
REF
Reference voltage for the SSTL and HSTL I/O standards.
V
REF (AC)
AC input reference voltage for the SSTL and HSTL I/O standards. V
REF(AC)
= V
REF(DC)
+ noise. The
peak-to-peak AC noise on V
REF
must not exceed 2% of V
REF(DC)
.
V
REF (DC)
DC input reference voltage for the SSTL and HSTL I/O standards.
V
SWING (AC)
AC differential input voltage: AC input differential voltage required for switching. For the SSTL
differential I/O standard, refer to Input Waveforms.
V
SWING (DC)
DC differential input voltage: DC input differential voltage required for switching. For the SSTL
differential I/O standard, refer to Input Waveforms.
V
TT
Termination voltage for the SSTL and HSTL I/O standards.
V
X (AC)
AC differential input cross point voltage: The voltage at which the differential input signals must
cross.
W ——
X ——
Y ——
Z ——
Table 1–46. Glossary (Part 5 of 5)
Letter Term Definitions