Seagate Cheetah NS 10K Product Manual page 71

Cheetah ns sas product manual

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9.5.2.5

Receiver characteristics

The drive receiver is A.C. coupled. The receive network terminates the TxRx connection by a 100 ohm equiva-

lent impedance as specified in table 18.

-12

The receiver operates within a BER of 10

when a SAS signal with valid voltage and timing characteristics is

delivered to the compliance point from a 100 ohm source. The received SAS signal are considered valid if it

meets the voltage and timing limits specified in table 15.

Additionally the receiver operates within the BER objective when the signal at a receiving phy has the addi-

tional sinusoidal jitter present that is specified in table 17 and the common mode signal V

over frequency

range F

as specified in table 13. The jitter tolerance is shown in Figure 32 for all Rx compliance points in a

TxRx connection. The figure given assumes that any external interference occurs prior to the point at which the

test is applied. When testing the jitter tolerance capability of a receiver, the additional 0.1 UI of sinusoidal jitter

may be reduced by an amount proportional to the actual externally induced interference between the applica-

tion point of the test and the input to the receiving phy. The additional jitter reduces the eye opening in both

voltage and time.

Cheetah NS SAS Product Manual, Rev. A

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