Seagate ST973451FC Manuale Utente
Savvio 15K.1 FC Product Manual, Rev. B
65
9.6.2
Differential PECL output
The serial PECL output signal voltage characteristics are provided in Table 26. The outputs are not AC coupled
in order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to
isolate potentially different DC characteristics of the outputs and the receiver.
in order to deliver maximum signal without rise and fall time degradation. You must AC couple the receiver to
isolate potentially different DC characteristics of the outputs and the receiver.
Figure 18 provides the data output valid eye diagram relative to the bit cell time.
Figure 18. Transmit eye diagram
9.6.3
Differential PECL input
The serial PECL input signal voltage characteristics are provided in Table 27.
Figure 19 provides the data valid eye diagram for typical and minimum requirements to recover data at the
specified interface error rate. The inputs are AC coupled on the drive.
specified interface error rate. The inputs are AC coupled on the drive.
Figure 19. Receive eye diagram
Table 26:
Differential PECL output characteristics
Description
Parameter
Notes
Serial output voltage swing
600 < V
out
< 1300 mV
Centered at 1.32V
Table 27:
Differential PECL input characteristics
Description
Parameter
Notes
Serial input voltage swing
200 < V
in
< 1.300 mV
AC coupled
941 ps
Vout (mv)
800 ps
941 ps
659 ps
Vin (mv)
Typical
Minimum
376 ps