ep1s25 Altera Corporation, ep1s25 Datasheet - Page 227
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ep1s25
Manufacturer Part Number
ep1s25
Description
Stratix Device Family Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EP1S25.pdf
(276 pages)
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Altera Corporation
January 2006
Definition of I/O Skew
I/O skew is defined as the absolute value of the worst-case difference in
clock-to-out times (t
common clock source.
I/O bank skew is made up of the following components:
■
■
Figure 4–5
bank, being fed by a common clock source. The clock can come from an
input pin or from a PLL output.
Figure 4–5. I/O Skew within an I/O Bank
Clock network skews: This is the difference between the arrival times
of the clock at the clock input port of the two IOE registers.
Package skews: This is the package trace length differences between
(I/O pad A to I/O pin A) and (I/O pad B to I/O pin B).
Slow Edge
Common Source of GCLK
shows an example of two IOE registers located in the same
I/O Pin B
Fast Edge
I/O Pin A
I/O Skew
CO
I/O Bank
) between any two output registers fed by a
I/O Skew
Stratix Device Handbook, Volume 1
DC & Switching Characteristics
I/O Pin A
I/O Pin B
4–57
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