EP4CE115 datasheet(22/42 Pages) ALTERA

22 / 42 page

1–22

Chapter 1: Cyclone IV Device Datasheet

Switching Characteristics

Cyclone IV Device Handbook,

May 2013

Altera Corporation

Volume 3

Figure 1–4 shows the differential receiver input waveform.

Figure 1–5 shows the transmitter output waveform.

Table 1–22 lists the typical VOD for Tx term that equals 100 .

Figure 1–4. Receiver Input Waveform

Single-Ended Waveform

Differential Waveform

VID (diff peak-peak) = 2 x VID (single-ended)

Positive Channel (p)

Negative Channel (n)

Ground

VID

− n = 0 V

VCM

Figure 1–5. Transmitter Output Waveform

Single-Ended Waveform

Differential Waveform

VOD (diff peak-peak) = 2 x VOD (single-ended)

Positive Channel (p)

Negative Channel (n)

Ground

VOD

− n = 0 V

VCM

Table 1–22. Typical VOD Setting, Tx Term = 100 

Symbol

VOD Setting (mV)

4 (1)

VOD differential peak

to peak typical (mV)

400

600

800

900

1000

1200

Note to Table 1–22:

(1) This setting is required for compliance with the PCIe protocol.

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