Seagate ST31000640SSIM manual Peak-to, Sinusoidal, Jitter, Frequency in kHz

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:		X2OP – ((0, 5)xadditional sinusoidal jitter) – X1OP
Z1TOL	= Z1OPx
		----------------------------------------------------------------------------------------------------------------------------------X2OP– X1OP
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.

Peak-to-

peak	Sinusoidal jitter frequency
sinusoidal
	(log/log plot)
jitter
(in UI)	FNOM = 1.5 x 10 9 for 1.5 Gbps
1.5	F	NOM	= 3.0 x 10 9 for 3.0 Gbps
1.0
0.1
0	FNOM / 25,000		FNOM / 1,667

Frequency (in kHz)

Figure 18. Sinusoidal jitter mask

62 Barracuda ES.2 SAS Product Manual, Rev. G