1–28

Chapter 1: Cyclone III Device Datasheet

Glossary

Cyclone III Device Handbook

July 2012

Altera Corporation

Volume 2

N

——

O

——

P

PLL Block

The following block diagram highlights the PLL Specification parameters.

Q

——

R

Receiver differential input discrete resistor (external to Cyclone III devices).

Receiver Input

Waveform

Receiver Input Waveform for LVDS and LVPECL Differential Standards.

RSKM (Receiver

input skew

margin)

HIGH-SPEED I/O Block: The total margin left after accounting for the sampling window and TCCS.

RSKM = (TUI – SW – TCCS) / 2.

Table 1–39. Glossary (Part 2 of 5)

Letter

Term

Definitions

Core Clock

Phase tap

Reconfigurable in User Mode

Key

CLK

N

M

PFD

VCO

CP

LF

CLKOUT Pins

GCLK

Switchover

Counters

C0..C4

Single-Ended Waveform

Differential Waveform (Mathematical Function of Positive & Negative Channel)

Positive Channel (p) = V

IH

Negative Channel (n) = V

IL

Ground

V

ID

V

ID

0 V

V

CM

p

- n

V

ID