Seagate ST936751SS ユーザーズマニュアル
62
Savvio 15K SAS Product Manual, Rev. B
Figure 18 defines the sinusoidal jitter mask.
Figure 18.
Sinusoidal jitter mask
9.5.2.2
Transmitter signal characteristics
Table 17 specifies the signal requirements at the transmitter end of a TxRx connection as measured into the
zero-length test load. All specifications are based on differential measurements.
zero-length test load. All specifications are based on differential measurements.
The OOB sequence is performed at signal voltage levels corresponding to the lowest supported transfer rate.
Table 17 specifies the signal characteristics.
Table 17 specifies the signal characteristics.
Table 17:
Transmitter signal characteristics
Signal characteristic
Units
1.5 Gbps
3.0 Gbps
Skew
ps
20
15
Tx Off Voltage
mV(P-P)
< 50
< 50
Maximum rise/fall time
ps
273
137
Minimum rise/fall time
ps
67
67
Maximum transmitter output imbalance
%
10
10
OOB offset delta
mV
±
25
±
25
OOB common mode delta
mV
±
50
±
50
F
NOM
/ 25,000
F
NOM
/ 1,667
Sinusoidal jitter frequency
(log/log plot)
Peak-to-
peak
sinusoidal
jitter
(in UI)
F
NOM
= 1.5 x 10
9
for 1.5 Gbps
F
NOM
= 3.0 x 10
9
for 3.0 Gbps
1.5
0
0.1
Frequency (in kHz)
1.0