The leading and trailing edge slopes of figure 18 shall be preserved. As a result the amplitude value of Z1 is
less than that given in table 30 and Z1TOL and Z1OP shall be defined from those slopes by the following equa- | ||
tion: | X2OP – ((0, 5)xadditional sinusoidal jitter) – X1OP | |
Z1TOL | ||
= | ||
| X2OP – X1OP | |
where:
Z1TOL is the value for Z1 to be used for the tolerance masks; and
Z1OP, X1OP, and X2OP are the values in table 30 for Z1, X1, and X2.
The X1 points in the receive tolerance masks are greater than the X1 points in the receive masks, due to the addition of sinusoidal jitter.
Figure 20 defines the sinusoidal jitter mask.
Peak-to-
peak | Sinusoidal jitter frequency | |||
sinusoidal | ||||
(log/log plot) | ||||
jitter | ||||
|
|
| ||
(in UI) | F |
| = 1.5 x 10 9 for 1.5 Gbps | |
| NOM | |||
| F | = 3.0 x 10 9 for 3.0 Gbps | ||
1.5 | NOM | |||
|
| |||
1.0 |
|
|
| |
0.1 |
|
|
| |
0 |
|
|
| |
| FNOM / 25,000 | FNOM / 1,667 | ||
Frequency (in kHz)
Figure 20. Sinusoidal jitter mask
70 | Cheetah 15K.6 SAS Product Manual, Rev. B |
