Operating Conditions
Figure 5–1. Receiver Input Waveforms for Differential I/O Standards
Single-Ended Waveform
Positive Channel (p) = V
IH
V
(1)
ID
Negative Channel (n) = V
Ground
IL
V
(2)
ICM
Differential Waveform (Mathematical Function of Positive and Negative Channel)
V
(1)
ID
0 V
(1)
V
ID
p − n (3)
Notes to Figure 5–1:
(1) VID is the differential input voltage. VID = |p – n|.
(2) VICM is the input common mode voltage. VICM = (p + n)/2.
(3) The p – n waveform is a function of the positive channel (p) and the negative channel (n).
5–8
Altera Corporation
February 2008
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
