EP4CGX30CF23C8N Datasheet, PDF (22/42 Pages) Altera Corporation – Cyclone IV Device Datasheet

1–22
Chapter 1: Cyclone IV Device Datasheet
Switching Characteristics
Figure 1–4 shows the differential receiver input waveform.
Figure 1–4. Receiver Input Waveform
Single-Ended Waveform
V_ID
V_CM
Positive Channel (p)
Negative Channel (n)
Ground
Differential Waveform
V_ID
VID (diff peak-peak) = 2 x VID (single-ended)
p−n=0V
V_ID
Figure 1–5 shows the transmitter output waveform.
Figure 1–5. Transmitter Output Waveform
Single-Ended Waveform
V_CM
V_OD
Positive Channel (p)
Negative Channel (n)
Ground
Differential Waveform
V_OD
VOD (diff peak-peak) = 2 x VOD (single-ended)
p−n=0V
V_OD
Table 1–22 lists the typical V_OD for Tx term that equals 100 .
Table 1–22. Typical V_OD Setting, Tx Term = 100 
Symbol
1
2
V_OD differential peak
to peak typical (mV)
400
600
Note to Table 1–22:
(1) This setting is required for compliance with the PCIe protocol.
V_OD Setting (mV)
3
4 ⁽¹⁾
800
900
5
1000
6
1200
Cyclone IV Device Handbook,
Volume 3
December 2013 Altera Corporation