DC & Switching Characteristics
Figure 6–2. Receiver Input Waveform Example with Values
Single-Ended Waveform:
What is Applied
to the Pin (2)
Positive
Channel (p)
V
= 1 V
V
= 1.175 V + 0.5 V = 1.675 V
ID
IH
Negative
Channel (n)
V
= 1.175 V (3)
ICM
V = 1.175 V - 0.5 V = 0.675 V
IL
Ground
Differential Waveform:
As Seen by the Buffer
or by Subtraction on an Oscilloscope
V
= 1 V
ID
p - n = 0 V
V
= 1 V
ID
V
V
Differential ID = 2 * ID (Single-Ended) = 2 V
Notes to Figure 6–2:
(1) The values in this figure are for example only.
(2) These values must meet the voltages specified in the section “Operating Conditions” on page 6–1.
(3) If internal termination is used, the common mode is generated after the pins.
Figure 6–3. Transmitter Output Waveforms for Differential I/O Standards
Single-Ended Waveform
Positive Channel (p) = V
OH
V
ID
Negative Channel (n) = V
Ground
OL
V
CM
Differential Waveform
(V (Differential) = 2 x V (single-ended))
ID
ID
V
ID
p − n = 0 V
V
ID
Altera Corporation
June 2006
6–13
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
