Seagate Cheetah 15K Product Manual page 74

The leading and trailing edge slopes of figure 18 shall be preserved. As a result the amplitude value of Z1 is
less than that given in table 30 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 30 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.
Figure 20 defines the sinusoidal jitter mask.
Peak-to-
peak
Sinusoidal jitter frequency
sinusoidal
jitter
(in UI)
1.5
1.0
0.1
0
F / 25,000
NOM
Frequency (in kHz)
Figure 20. Sinusoidal jitter mask
70
and Z1
TOL
( ( )xadditional sinusoidal jitter
X2 – 0 5 ,
OP
x ---------------------------------------------------------------------------------------------------------------------------------- -
X2
(log/log plot)
9
F = 1.5 x 10 for 1.5 Gbps
NOM
9
F = 3.0 x 10 for 3.0 Gbps
NOM
F / 1,667
NOM
shall be defined from those slopes by the following equa-
OP
X1
–
OP OP
Cheetah 15K.6 SAS Product Manual, Rev. B
)
– X1
OP