Seagate ST3400755SS manual Receiver jitter tolerance, Compliant jitter test pattern Cjtpat

9.5.2.3.2Receiver jitter tolerance

Table 17 defines the amount of jitter the receiver shall tolerate .

Table 17: Receiver jitter tolerance

	1.5 Gbpsa			3.0 Gbpsa
Sinusoidal	Deterministic	Total	Sinusoidal	Deterministic	Total
jitterb,c	jittere,f,h	jitterh	jitterb,d	jittere,g,h	jitterh
0.10	0.35	0.65	0.10	0.35	0.65

aUnits are in UI.

bThe jitter values given are normative for a combination of deterministic jitter, random jitter, and sinusoidal jitter that receivers shall be able to tolerate without exceeding a BER of 10-12. Receivers shall tolerate sinusoidal jitter of progressively greater amplitude at lower frequencies, according to the mask in figure 32 with the same deterministic jitter and random jitter levels as were used in the high frequency sweep.

cSinusoidal swept frequency: 900 kHz to > 5 MHz.

dSinusoidal swept frequency: 1.800 kHz to > 5 MHz.

eNo value is given for random jitter. For compliance with this standard, the actual random jitter amplitude shall be the value that brings total jitter to the stated value at a probability of 10-12. The additional 0.1 UI of sinusoidal jitter is added to ensure the receiver has sufficient operating margin in the presence of external interference.

fDeterministic jitter: 900 kHz to 750 MHz.

gDeterministic jitter: 1.800 kHz to 1.500 MHz.

hThe deterministic and total values in this table apply to jitter after 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).

9.5.2.3.3Compliant jitter test pattern (CJTPAT)

The CJTPAT within a compliant protocol frame is used for all jitter testing unless otherwise specified. See the SAS Interface Manual for definition of the required pattern on the physical link and information regarding spe- cial considerations for scrambling and running disparity.

9.5.2.3.4Impedance specifications

Table 18 defines impedance requirements.

Table 18: Impedance requirements (Sheet 1 of 2)

Requirement	Units	1.5 Gbps	3.0 Gbps
Time domain reflectometer rise time 20 % to 80 %a,b	ps	100	50
Media (PCB or cable)
Differential impedanceb,c,d	ohm	100 ± 10	100 ± 10
Differential impedance imbalanceb,c,d,g	ohm	5	5
Common mode impedanceb,c,d	ohm	32.5 ± 7.5	32.5 ± 7.5
Mated connectors
Differential impedanceb,c,d	ohm	100 ± 15	100 ± 15
Differential impedance imbalanceb,c,d,g	ohm	5	5
Common mode impedanceb,c,d	ohm	32.5 ± 7.5	32.5 ± 7.5
Receiver termination
Differential impedanceb,e,f	ohm	100 ± 15	100 ± 15
Differential impedance imbalanceb,e,f,g	ohm	5	5
Receiver termination time constantb,e,f	ps	150 max	100 max

Cheetah NS SAS Product Manual, Rev. B 61