Seagate ST3300457FC Cheetah 15K.6 SAS Product Manual - Page 74
additional sinusoidal jitter
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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 Z1TOL and Z1OP shall be defined from those slopes by the following equa- tion: Z1TOL = Z1OP x -X----2---O----P 0---,----5---)---x---a---d---d----i-t--i-o---n----a---l---s---i-n----u---s---o---i--d---a---l---j--i-t--t-e----r--)---------X-----1---O----PX2OP - 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 30 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 20 defines the sinusoidal jitter mask. Peak-topeak sinusoidal jitter (in UI) 1.5 Sinusoidal jitter frequency (log/log plot) FNOM = 1.5 x 10 9 for 1.5 Gbps FNOM = 3.0 x 10 9 for 3.0 Gbps 1.0 0.1 0 FNOM / 25,000 FNOM / 1,667 Frequency (in kHz) Figure 20. Sinusoidal jitter mask 70 Cheetah 15K.6 SAS Product Manual, Rev. B