Seagate Savvio 10K Product Manual page 77

Figure 25 shows an ISI loss example at 1.5 Gbps.
S (dB)
21
Compliance interconnect magnitude response and ISI
0
ISI loss
> 2.0 dB
-5.4 dB
0.15
0.75
Figure 25. ISI loss example at 1.5 Gbps
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 31.
The receiver operates within a BER of 10
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 28.
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 30 and the common mode signal V
range F as specified in table 26. The jitter tolerance is shown in Figure 21 for all Rx compliance points in a
CM
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.
Savvio SAS Product Manual, Rev. D
loss example for 1.5 Gbps
Sample compliance interconnect
1.5
-12
when a SAS signal with valid voltage and timing characteristics is
Frequency (GHz)
over frequency
CM
71