1–28
Chapter 1: Cyclone III Device Datasheet
Glossary
Table 1–39. Glossary (Part 2 of 5)
Letter
N
O
Term
Definitions
The following block diagram highlights the PLL Specification parameters.
Switcho v er
CLKOUT Pins
f OUT _EXT
CLK
P
PLL Block
Core Clock
f I N
N
f I N PFD
PFD
CP
LF
VCO f VCO
Co u nters
C0..C4
f OUT
GCLK
Phase tap
M
Key
Reconfigurable in User Mode
Q
R
R L
Receiver Input
Waveform
Receiver differential input discrete resistor (external to Cyclone III devices).
Receiver Input Waveform for LVDS and LVPECL Differential Standards.
Single-Ended Waveform
Positi v e Channel (p) = V IH
V ID
N egati v e Channel (n) = V IL
V CM
Gro u nd
Differential Waveform (Mathematical Function of Positive & Negative Channel)
V ID
0V
V ID
p - n
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.
July 2012 Altera Corporation
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