Differential Pecl Output; Differential Pecl Input; Figure 18. Transmit Eye Diagram; Figure 19. Receive Eye Diagram - Seagate Savvio 10K Product Manual

9.6.2

Differential PECL output

The serial PECL output signal voltage characteristics are provided in Table 28. 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.
Table 28: Differential PECL output characteristics
Description
Serial output voltage swing
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 29.
Table 29: Differential PECL input characteristics
Description
Serial input voltage swing
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.

Figure 19. Receive eye diagram

68
Parameter
600 < V < 1300 mV
out
941 ps
800 ps
Parameter
200 < V < 1.300 mV
in
941 ps
659 ps
376 ps
Notes
Centered at 1.32V
Notes
AC coupled
Typical
Minimum
Savvio FC Product Manual, Rev. D