EP4CGX75DF27C7N Altera, EP4CGX75DF27C7N Datasheet - Page 144

• Manufacturer Part Number: EP4CGX75DF27C7N
• Description: Cyclone IV GX
• Manufacturer: Altera
• Series: CYCLONE® IV GXr

Specifications of EP4CGX75DF27C7N

• Number Of Logic Elements/cells: 73920
• Number Of Labs/clbs: 4620
• Total Ram Bits: 4257792
• Number Of I /o: 310
• Number Of Gates: -
• Voltage - Supply: 1.16 V ~ 1.24 V
• Mounting Type: *
• Operating Temperature: 0°C ~ 85°C
• Package / Case: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

6–36
High-Speed I/O Timing
Table 6–11. High-Speed I/O Timing Definitions
Cyclone IV Device Handbook, Volume 1
Transmitter channel-to-channel skew
Sampling window
Time unit interval
Receiver input skew margin
Input jitter tolerance (peak-to-peak)
Output jitter (peak-to-peak)
Note to
(1) The TCCS specification applies to the entire bank of differential I/O as long as the SERDES logic is placed in the logic array block (LAB) adjacent
to the output pins.
Table
6–11:
Parameter
Figure 6–20
Figure 6–20. The Output Signal with Pre-Emphasis
This section discusses the timing budget, waveforms, and specifications for
source-synchronous signaling in Cyclone IV devices. Timing for source-synchronous
signaling is based on skew between the data and clock signals.
High-speed differential data transmission requires timing parameters provided by IC
vendors and requires you to consider the board skew, cable skew, and clock jitter. This
section provides information about high-speed I/O standards timing parameters in
Cyclone IV devices.
Table 6–11
defines the parameters of the timing diagram shown in
shows the differential output signal with pre-emphasis.
(1)
TCCS
SW
TUI
RSKM
Symbol
—
—
Negative channel (n)
Positive channel (p)
The timing difference between the fastest and slowest output
edges, including t
included in the TCCS measurement.
The period of time during which the data must be valid in order
for you to capture it correctly. The setup and hold times
determine the ideal strobe position in the sampling window.
T
The TUI is the data-bit timing budget allowed for skew,
propagation delays, and data sampling window.
RSKM is defined by the total margin left after accounting for the
sampling window and TCCS. The RSKM equation is:
Allowed input jitter on the input clock to the PLL that is tolerable
while maintaining PLL lock.
Peak-to-peak output jitter from the PLL.
RSKM
SW
= T
SU
=
+ T

--------------------------------------------- -
TUI SW TCCS
hd
+ PLL jitter.
–
CO
2
variation and clock skew. The clock is
–
Chapter 6: I/O Features in Cyclone IV Devices
Description

Overshoot
Undershoot
V
OD
© December 2010 Altera Corporation
Figure
High-Speed I/O Timing
6–21.