Seagate ST373455SS Cheetah 15K.5 SAS Product Manual - Page 69
Receive eye mask, 5.2.1.3, Jitter tolerance masks
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9.5.2.1.2 Receive eye mask Figure 20 describes the receive eye mask. This eye mask applies to jitter after the application of a single pole high-pass frequency-weighting function that progressively attenuates jitter at 20 dB/decade below a frequency of ((bit rate) / 1.667). Absolute amplitude (in V) Z2 Z1 0 V -Z1 -Z2 0 X1 X2 1-X1 1 1-X2 Normalized time (in UI) Figure 20. Receive eye mask Verifying compliance with the limits represented by the receive eye mask should be done with reverse channel traffic present in order that the effects of crosstalk are taken into account. 9.5.2.1.3 Jitter tolerance masks Figure 21 describes the receive tolerance eye masks and is constructed using the X2 and Z2 values given in table 18. X1OP is half the value for total jitter intable 18 and X1TOL is half the value for total jitter in table 19, for jitter frequencies above ((bit rate) / 1.667). Abs olute am plitude (in V) (additional sinusoidal jitter) / 2 Z2 Z1OP Z1TOL 0 V -Z1TOL -Z1OP -Z2 0 X1OP X2 1 1-X1OP X1TOL 1-X1TOL Normalized time (in UI) Outline of eye mask before adding sinusoidal jitter Outline of eye mask after adding sinusoidal jitter Figure 21. Receive tolerance eye mask Cheetah 15K.5 SAS Product Manual, Rev. E 63