Seagate ST973451SS ユーザーズマニュアル

60

Savvio 15K SAS Product Manual, Rev. B

Table 16 defines the general interface characteristics.

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

-12 

of the jitter population. The random content 

of the total jitter population has a range of 

±

 7 standard deviations.

Figure 16 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).

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.

Bit rate (nominal)

Mbaud

1,500

3,000

Unit interval (UI)(nominal)

ps

666.6

333.3

Impedance (nominal, differential )

ohm

100

100

Transmitter transients, maximum

V

±

 1.2

±

 1.2

Receiver transients, maximum

V

±

 1.2

±

 1.2

Z1

Z2

0 V

-Z1

-Z2

X1

X2

1-X2

1-X1

0

1