Seagate ST31000640SS, ST3500620SS, ST3750630SS Z1TOL Z1OPxX2OP 05,()xadditional sinusoidal jitter()X1OP, X2OP X1OP,

62 Barracuda ES.2 SAS Product Manual, Rev. E
The leading and trailing edge slopes of figure 16 shall be preserved. As a result the amplitude value of Z1 is
less than that given in table 17 and Z1TOL and Z1OP shall be defined from those slopes by the following equa-
tion:
where:
Z1TOL is the value for Z1 to be used for the tolerance masks; and
Z1OP
, X1OP , and X2OP are the values in table 17 for Z1, X1, and X2.
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 18 defines the sinusoidal jitter mask.
Figure 18. Sinusoidal jitter mask
Z1TOL Z1OPxX2OP 05,()xadditional sinusoidal jitter()–X1OP
–
X2OP X1OP –
-----------------------------------------------------------------------------------------------------------------------------------=
FNOM / 25,000 FNOM / 1,667
Sinusoidal jitter frequency
(log/log plot)
Peak-to-
peak
sinusoidal
jitter
(in UI) FNOM
= 1.5 x 10 9 for 1.5 Gbps
FNOM
= 3.0 x 10 9 for 3.0 Gbps
1.5
0
0.1
Frequency (in kHz)
1.0