Seagate Savvio 10K Product Manual page 68

Table 26 defines the general interface characteristics.
Table 26: General interface characteristics
Characteristic
Bit rate (nominal)
Unit interval (UI)(nominal)
Impedance (nominal, differential )
Transmitter transients, maximum
Receiver transients, maximum
9.5.2.1 Eye masks
9.5.2.1.1 Eye masks overview
The eye masks are graphical representations of the voltage and time limits on the signal at the compliance
point. The time values between X1 and (1 - X1) cover all but 10
of the total jitter population has a range of ± 7 standard deviations.
9.5.2.1.2 Receive eye mask
Figure 19 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-X2
Normalized time (in UI)
Figure 19. 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.
62
1-X1 1
Units 1.5 Gbps
Mbaud 1,500
ps 666.6
ohm 100
± 1.2
V
± 1.2
V
-12
of the jitter population. The random content
Savvio SAS Product Manual, Rev. D
3.0 Gbps
3,000
333.3
100
± 1.2
± 1.2