Seagate Savvio 10K Manual download pdf (Page 62)

56 Savvio 10K.2 SAS Product Manual, Rev. E

10.5.2.1.2 Receive eye mask

Figure 15 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).

Figure 15. 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.

10.5.2.1.3 Jitter tolerance masks

Figure 16 describes the receive tolerance eye masks and is constructed using the X2 and Z2 values given in

table 29. X1

is half the value for total jitter intable 29 and X1

TOL

is half the value for total jitter in table 30, for

jitter frequencies above ((bit rate) / 1.667).

Figure 16. Reveive tolerance eye mask

Absolute

amplitude

(in V)

-Z1

-Z2

X1 X2

1-X2

1-X1

Normalized time (in UI)

Absolute

amplitude

(in V)

TOL

-Z1

1-X1

TOL

1-X1

Normalized time (in UI)

(additional sinusoidal jitter) / 2

-Z1

TOL

Outline of eye mask

after adding

sinusoidal jitter

Outline of eye mask

before adding

sinusoidal jitter

-Z2

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 75 76

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