Seagate Savvio 10K Product Manual page 69

9.5.2.1.3 Jitter tolerance masks
Figure 20 describes the receive tolerance eye masks and is constructed using the X2 and Z2 values given in
table 29. X1 is half the value for total jitter intable 29 and X1
OP
jitter frequencies above ((bit rate) / 1.667).
Absolute
amplitude
(in V)
Z2
Z1
OP
Z1
TOL
0 V
-Z1
TOL
-Z1
OP
-Z2
0 X1
OP
X1
TOL
Normalized time (in UI)
Figure 20. Reveive tolerance eye mask
The leading and trailing edge slopes of figure 19 shall be preserved. As a result the amplitude value of Z1 is
less than that given in table 28 and Z1
tion:
Z1 = Z1
TOL OP
where:
Z1 is the value for Z1 to be used for the tolerance masks; and
TOL
Z1 , X1 , and X2 are the values in table 28 for Z1, X1, and X2.
OP OP OP
The X1 points in the receive tolerance masks are greater than the X1 points in the receive masks, due to the
addition of sinusoidal jitter.
Savvio SAS Product Manual, Rev. D
(additional sinusoidal jitter) / 2
Outline of eye mask
Outline of eye mask
X2 1
1-X1
OP
1-X1
TOL
and Z1
TOL
( ( )xadditional sinusoidal jitter
X2 0 5 ,
–
OP
---------------------------------------------------------------------------------------------------------------------------------- -
x
X2
is half the value for total jitter in table 30, for
TOL
before adding
sinusoidal jitter
after adding
sinusoidal jitter
shall be defined from those slopes by the following equa-
OP
X1
–
OP OP
)
X1
–
OP
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