Differential Pecl Output; Differential Pecl Input; Figure 20. Transmit Eye Diagram; Figure 21. Receive Eye Diagram - Seagate ST336704FC Product Manual

Cheetah 36LP FC Product Manual, Rev. C
9.6.3

Differential PECL output

The serial PECL output signal voltage characteristics are provided in Table 27. 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 27: Differential PECL output characteristics
Description
Serial output voltage swing
Figure 20 provides the data output valid eye diagram relative to the bit cell time. Table 29 lists the data values.
Figure 20. Transmit eye diagram
9.6.4

Differential PECL input

The serial PECL input signal voltage characteristics are provided in Table 28.
Table 28: Differential PECL input characteristics
Description
Serial input voltage swing
Figure 21 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. Table 29 lists the data values.
Figure 21. Receive eye diagram
Parameter
300 < V < 650 mV
out
Parameter Notes
400 < V < 2.000 mV AC coupled
in
Bit Time
XMIT Eye
Bit Time
RCV Eye
(typical)
(minimum)
61