Finisar AN-2030 - Manual (Page 33)

AN-2030: Digital Diagnostic Monitoring Interface for Optical Transceivers
F i n i s a r
9/26/02 Revision D Page 33
of the command/control byte (R/W) defines the operation to be performed. When set to
a 1 a read operation is selected, and when set to a 0 a write operation is selected.
Following the START condition, the DDTC monitors the SDA bus checking the device
type identifier being transmitted. Upon receiving the chip address control code, and the
read/write bit, the slave device outputs an acknowledge signal on the SDA line.
Figure 1: 2- Wire Protocol Data Transfer Protocol
Figure 2: 2- Wire AC Characteristics
(Please see definitions in the following pages)